File readme for Standards for Digital Line Graphs (DLG)
documentation in the stdlg subdirectory of the public directory
-- 9/01/94 --
Standards for DLG documentation is divided into three parts;
Part 1: General (one file)
Part 2: Specifications (four files)
Part 3: Attribute Coding (eleven files)
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stpt1all Contents for the complete standard and Part 1:
General, containing series description and data
sources, content, and structure
stpt2txt Part 2: Specifications, containing coordinate
systems, cell size and file extent, error
definition, data quality, and distribution
formats
stpt2-2a Part 2: Specifications Appendix A, containing
standard DLG distribution format
stpt2-2b Part 2: Specifications Appendix B, containing
optional DLG distribution format
stpt2-2c Part 2: Specifications Appendices C, D, and E,
containing 1:2,000,000-scale graphic format, map
projection parameters, and U.S. National Map
Accuracy Standards
stpt3-tc Part 3: Attribute Coding introductory pages,
containing table of contents, lists of figures,
tables, and pages
stpt3-in Part 3: Attribute Coding sections containing
objectives, symbol references, and coding
structure (pp 3-1 through 3-14)
stpt3-hp Part 3: Attribute Coding section entitled
Hypsography (pp 3-15 through 3-25)
stpt3-hy Part 3: Attribute Coding section entitled
Hydrography (pp 3-26 through 3-67)
stpt3-sc Part 3: Attribute Coding section entitled
Vegetative Surface Cover (pp 3-68 through 3-73)
stpt3-nv Part 3: Attribute Coding section entitled
Non-Vegetative Features (pp 3-74 through 3-78)
stpt3-bd Part 3: Attribute Coding section entitled
Boundaries (pp 3-79 through 3-91)
stpt3-sm Part 3: Attribute Coding section entitled
Survey Control and Markers (pp 3-92 through 3-100)
stpt3-tr Part 3: Attribute Coding section entitled
Transportation (pp 3-101 through 3-152)
stpt3-ms Part 3: Attribute Coding section entitled
Manmade Features (pp 3-153 through 3-192)
stpt3-pl Part 3: Attribute Coding section entitled
U.S. Public Land Survey System
(pp 3-193 through 3-247)
fig2-2b Figure for example diagram on p. 2B-19
(Part 2, Appendix B)
fig3-1 Figure 3-1 on p. 3-39
fig3-2 Figure 3-2 on p. 3-71
National Mapping Program
Technical Instructions
Part 2
Specifications
Standards for
Digital Line Graphs
(Current version containing all changes through 3/1/94)
Department of the Interior
U.S. Geological Survey
National Mapping Division
CONTENTS
Page
2. Specifications . . . . . . . . . . . . . . . . . . . . . 2-1
2.l Coordinate Systems . . . . . . . . . . . . . . . . . 2-l
2.2 Cell Size and File Extent . . . . . . . . . . . . . 2-3
2.3 Error Definition . . . . . . . . . . . . . . . . . . 2-5
2.3.l Blunders . . . . . . . . . . . . . . . . . . 2-5
2.3.2 Systematic Errors . . . . . . . . . . . . . . 2-5
2.3.3 Random Errors . . . . . . . . . . . . . . . . 2-6
2.3.4 Standard Error . . . . . . . . . . . . . . . 2-6
2.4 Data Quality . . . . . . . . . . . . . . . . . . . . 2-7
2.4.l Lineage . . . . . . . . . . . . . . . . . . . 2-7
2.4.2 Positional Accuracy . . . . . . . . . . . . . 2-7
2.4.3 Attribute Accuracy . . . . . . . . . . . . . 2-8
2.4.4 Edge Matching . . . . . . . . . . . . . . . . 2-8
2.4.5 Quality Control Flags . . . . . . . . . . . . 2-9
2.4.6 Logical Consistency . . . . . . . . . . . . . 2-ll
2.4.7 Completeness . . . . . . . . . . . . . . . . 2-ll
2.5 Distribution Formats . . . . . . . . . . . . . . . . 2-12
APPENDICES
Appendix 2-A Standard DLG Distribution Format . . . . . . . 2A-l
Appendix 2-B Optional DLG Distribution Format . . . . . . . 2B-l
Appendix 2-C l:2,000,000-Scale Graphic DLG Format . . . . . 2C-l
Appendix 2-D Map Projection Parameters . . . . . . . . . . . 2D-l
Appendix 2-E U. S. National Map Accuracy Standards . . . . . 2E-l
TABLES
Table 2.l Comparison of Standard and Optional DLG Formats . . 2-12
2. SPECIFICATIONS
Specifications for DLG data will be described by
considering the following subject areas: coordinate
systems, cell size and extent, error definition, data
quality and distribution format.
2.l COORDINATE SYSTEMS
The positional descriptions for DLG data elements are
expressed in one of several coordinate systems,
dependent upon the distribution format selected.
The DLG data in the standard distribution format are
encoded using an internal file coordinate system to
minimize storage requirements. The characteristics of
this system are as follows:
o The coordinate system is Cartesian.
o The origin (x=0, y=0) is at the center of the cell.
Some older files will have their origin below and
to the left of the lower left corner of the cell.
o The x axis of the coordinate system is parallel to
a theoretical straight line connecting the
southwest and southeast corners of the cell, and
the y axis is perpendicular to that line.
o One unit is equal to 0.00l inch at map scale.
o The coordinate domain is limited to the range -
32768 to +32767.
The file header contains the parameters of a
transformation which can be used to convert the internal
file coordinates to the ground coordinate system in
either Universal Transverse Mercator (UTM) for l:24,000-
and l:l00,000-scale DLG's, or Albers Conical Equal Area
for l:2,000,000-scale DLG's.
The DLG data in the optional distribution format are
expressed in the units of the respective ground
coordinate systems; that is, meters in the UTM or Albers
Conical Equal Area systems.
The l:2,000,000-scale DLG data in the graphics
distribution format are expressed in geographic
coordinates (latitude and longitude). These values are
expressed in degrees, minutes, and seconds.
2.2 CELL SIZE AND FILE EXTENT
In general the large-scale DLG's are stored and
distributed in standard cells of 7.5-minutes of latitude
by 7.5-minutes of longitude. Non-standard quadrangles
which have a neatline extended to accommodate overedge
information, (e.g. along national boundaries or in
coastal areas) are collected as multiple 7.5- minute
units.
Of the l:24,000-scale data collected from l5-minute
quadrangles, the majority are digitized as four 7.5-
minute units, and distributed in standard 7.5-minute
cells. A few older data files, collected from l5-minute
quadrangles, were digitized in single l5- minute units,
and are distributed in this format. In Alaska, data
digitized from l:24,000/l:25,000-scale source material
are stored in cells varying from l0-minutes to l8-
minutes of longitude, by 7.5-minutes of latitude,
depending on the latitude of the cell. Alaskan data
digitized from l:63,360-scale source material are stored
in cells varying from 20-minutes to 36-minutes of
longitude, by l5-minutes of latitude, depending on the
latitude of the cell.
The intermediate-scale DLG's, covering the contiguous
United States and Hawaii, are to be distributed in
groups of files that make up a 30- x 30-minute area of
coverage, each grouping representing the east or west
half of a l:l00,000-scale source map. Each 30-minute
area consists of a varying number of DLG files depending
on the category and the feature density. The normal
distribution group will be four l5-minute files per 30-
minute area. If the feature density of an area is such
that the file size would exceed the limitations of the
processing software, then that 30-minute area would be
covered by sixteen 7.5-minute files. In l986 the U.S.
Geological Survey released a preliminary version of
l:l00,000-scale DLG's. These data were packaged differently
than described above. The distribution cells for the "roads
and trails" portion of the "transportation" overlay, and
for the "hydrography" overlay, consist of sixteen 7.5-
minute files. The "railroads" and "miscellaneous
transportation" portions of the "transportation" overlay
consist of single 30-minute files. In northern Florida
and southern Georgia, the "railroads" and "miscellaneous
transportation" data may be in sixteen 7.5-minute files.
The small-scale DLG's are distributed predominantly in
multistate cells, which approximate the National Atlas
sectional maps. The total number of l:2,000,000-scale
DLG cells is twenty-one; fifteen for the conterminous
United States, five for Alaska and one for Hawaii.
The data for each cell are encoded in multiple thematic
categories. Normally, there is one file per category.
However, due to software limitations at the time of
digitizing, some categories with a large number of
elements may be encoded in several files.
2.3 ERROR DEFINITION
DLG data may contain errors of three types: blunders,
which should be removed prior to entry to the data base;
systematic errors, occurring in a system-specific or a
procedure-specific pattern; and accidental errors, which
are of a purely random nature and are completely
unpredictable. Although all three types may be reduced
in magnitude by refinements in technique and precision,
they never can be completely eliminated.
2.3.l Blunders
For DLG data, a blunder is an error of major proportions
often exceeding 0.009 inch (3 times the standard error)
in the x or y component directions. This is the maximum
error permitted for DLG data, and as such is easily
identifiable. Moreover, a blunder is an indication that
the data collection process has deteriorated beyond the
level of simple systematic or random errors. Every
effort is made to eliminate identifiable blunders during
processing and quality-control operations. However,
despite design precautions, some blunders may remain.
2.3.2 Systematic Errors
Systematic errors are those errors that are introduced by
procedures or systems and typically are predictable but
not easily correctable. These types of errors cause a
bias or artifact in the final product, but are generally
not large enough to be classed as blunders. For DLG
data, localized systematic errors could include
artifacts which are typical of raster-digitized data.
Unidentified and uncorrected systematic errors are
included in and contaminate the accuracy statistics used
to describe the final DLG.
2.3.3 Random Errors
Random errors are those errors considered to be
observational in nature or a result of limitations in
measuring precision. They are caused by both system and
human limitations. Random errors generally conform to
a normal error distribution.
2.3.4 Standard Error
The standard error statistic is used to describe the
horizontal accuracy of a DLG, encompassing both random
and systematic errors introduced during production of the
data. The standard error is computed in both x and y
component directions.
Standard error (SE) for the x or y direction is
defined as:
where Si = DLG x or y coordinate of a test point
St = true x or y coordinate of a test point
n = number of test points
The term St, "true" coordinate, refers to the "most
probable" coordinate value, since values are normally
derived from production map sources.
Accuracy is computed by comparison of the DLG
coordinate with true coordinates derived with a higher
order of accuracy. Test points should be well defined
and well distributed and have "true" coordinates with
accuracies greater then the DLG accuracy criteria.
2.4 DATA QUALITY
Five characteristics relating to digital data quality are
included as sections of a quality report. The goal of
this type of standard is to allow the user the freedom
to evaluate the usefulness of the data for a given
application, rather than applying a quantitative
threshold towards each characteristic. The quality of
Digital Line Graph data can be described in terms of the
following five characteristics: lineage, positional
accuracy, attribute accuracy, logical consistency, and
completeness. The procedures for specifying and
validating these characteristics are described in Part
5: Quality Control and Verification.
2.4.l Lineage
Lineage data generally provide information on the source
of the data file, collection procedures, processing
steps, reference systems, projection transformation
parameters, data resolution, and coordinate domain.
DLG data carry some lineage information in the header
record for each file. Format specifications designate
specific fields for lineage data elements (see
Appendices 2-A and 2-B). Additionally, lineage data is
described in related NMD Technical Instructions, such as
Procedure Manuals and Data Users Guides.
2.4.2 Positional Accuracy
DLG positional accuracy is based on the use of standard
USGS graphic products as the fundamental source for
initial loading of the NDCDB. These source graphics are
normally compiled to meet National Map Accuracy
Standards (see Appendix 2-E), where 90 percent of well-
defined features are to be within 0.02 inches of
true mapped ground position. The DLG positional error
shall be less than or equal to 0.003 inches standard
error in both the x and y component directions, relative
to the source that was digitized.
Positional consistency of DLG elements that span
quadrangle edges may be altered using edge alignment
routines that result in "snapping" together
corresponding node and line elements that are located
within 0.020 inches of each other. The maximum
positional adjustment for any node and associated line
element would be 0.010 inches.
2.4.3 Attribute Accuracy
DLG data represent the source graphic and, therefore,
data for a given category will contain attribute codes
that reflect the information portrayed on the source.
All attribute codes of DLG data in the NDCDB will agree
within 98.5 percent to attribute codes as described in
Part 3 of this Standard: Attribute Coding.
2.4.4 Edge Matching
Validation software provides for checking the edges of
each quadrangle against the edges of the four adjacent
quadrangles. Each edge of a DLG-3 is checked for
positional and attribute matching along the neatlines of
the adjoining DLG-3 cells, providing that the surrounding
data cells are available at the time the DLG-3 is
entered into the NDCDB.
DLG's archived prior to implementation of edge matching
requirements may not have been edge checked. All
projects authorized after April 30, l988 are required to
meet current edge matching specifications, both for
joins internal to the project and for joins to adjacent
DLG's already existing in the NDCDB. l00K DLG data
archived prior to implementation of edge matching
requirements are to be reworked to conform to current
edge matching specifications.
2.4.5 Quality Control Flags
Information in the header of the DLG-3 indicates the
status of the file with respect to the edge matching
described above. The four status flags contain the
status of the West, North, East, and South edges of a
DLG-3 as compared to the edges of the four adjoining
DLG-3 files. Each of the four flags is followed by a
status reason code that explains the status of the four
edges respectively.
The possible status values for a DLG-3 entered into the
NDCDB are:
(blank) = no reason code set, ("unchecked" for
some earlier data sets)
0 = passed edge match check
l = alignment discontinuity
2 = attribute discontinuity
3 = attribute and alignment discontinuity
The possible reason codes are:
(blank) = no reason code set, ("unchecked" for
some earlier data sets)
4 = adjacent data do not exist
5 = adjacent data unavailable
6 = graphic discontinuity
7 = mismatch valid
8 = paneling unauthorized
The following combinations of status flags and reason
flags are currently valid for the processing software.
blank, blank blank, 4 blank, 5 blank,8
0,blank
l,6 l,7
2,6 2,7
3,6 3,7
The following is a brief explanation of the reason flags.
4 = adjacent data do not exist
This flag is used with a status flag of blank
(unchecked). This combination exists primarily for file
edges which are adjacent to areas unmapped within the
series/scale of products being digitized, e.g. coastal
and international boundary locations. This flag is also
used for U.S. Public Land Survey System (PLSS) file edges
which border areas of the country not having PLSS
information.
5 = adjacent data unavailable
This flag is used with a status flag of blank
(unchecked). It is appropriate for edges adjacent to
areas having similar source material and data
categories, but which have not been digitized and
archived. A reason code with the value of 5 may be reset
as the adjoining data cell becomes available for edge
match verification.
6 = graphic discontinuity
This flag indicates a discontinuity in classification or
alignment between features on adjacent graphics which
were digitized as represented.
7 = mismatch valid
This reason flag applies in the case of a linear graph
element ending precisely on the neatline or having a
reasonable attribute value change as it crosses the
neatline. (e.g. A road changing from third to fourth
class at the neatline.)
8 = paneling unauthorized
This flag is used with the edge status flag of blank and
indicates that no authorization was in place for edge
matching at the time the data were archived.
In the course of checking and aligning an edge it is
possible to encounter more than one reason for a
mismatch status, such as both valid and graphic
discontinuities. In such cases the reason flag is to be
set to indicate the "worst case", i.e. the reason
indicating the most serious problem with the edge and
which in most cases would require some degree of
correction in the future. For the above example, the
graphic discontinuity reason flag would be set in
preference to the mismatch valid flag.
2.4.6 Logical Consistency
Logical consistency describes topological fidelity
internal to a file. Certain node-area-line
relationships are collected or generated to satisfy
topological requirements. Some of these requirements
include: lines begin and end at nodes, lines connect to
each other at nodes, lines do not extend through nodes,
left and right areas are defined for each line element
and are consistent throughout the files and the lines
representing the limits of the file (neatline) are free
of gaps.
2.4.7 Completeness
Completeness refers to the subset of features or objects
represented in the DLG in relation to the domain, which
is the source graphic. The DLG for a given category of
data will contain at least the same level of content and
detail shown on the source graphic.
2.5 DISTRIBUTION FORMATS
Digital Line Graph data are available in two distribution
formats: (l) standard and (2) optional. DLG's from
l:2,000,000-scale maps are also available in a
"graphics" format.
The standard distribution format reflects design
decisions intended to minimize storage requirements.
Explicit topological linkages are contained only in the
line elements (starting node, ending node, an area to
the left of direction of travel, and an area to the
right of the direction of travel).
The optional distribution format was designed to
facilitate data usage. The topological relationships
explicitly encoded include starting node, ending node,
area to the left of direction of travel, and area to the
right of the direction of travel for line elements,
bounding lines for area elements, and bounded lines for
node elements. These files are typically larger than
those in the standard format but, for certain
applications, can simplify processing requirements. For
example, because topological linkages are explicitly
encoded for all line, node, and area elements, a polygon
data structure can be easily created. These linkages
facilitate Geographic Information System (GIS)
applications of DLG data as well as generation of
graphic products.
The characteristics of the standard and optional DLG
distribution formats are compared in table 2.l. The
format and record contents for the standard and optional
formats are summarized in Appendices 2-A an 2-B,
respectively.
Table 2-1
Comparison of DLG standard, optional and graphics formats
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Standard Optional Graphics
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Character set ASCII ASCII ASCII
Logical record 144 bytes 80 bytes 20 bytes
length
Physical record Variable in Variable in Variable in
length multiples multiples multiples
(block size) of l44 bytes of 80 bytes of 20 bytes
Coordinate system Internal file Ground planimetric: Geographic
(thousandths of UTM-24K and lOOK, (latitude
a map inch) Albers Conical and
Equal Area-2M longitude)
Topological Contained only Contained in node, None (only
linkages in line elements area, and line contains
elements line
elements)
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The l:2,000,000-scale graphics distribution format was
designed for use with the GS-CAM plotting package. GS-
CAM is a modified version of the Cartographic Automatic
Mapping (CAM) computer program. A graphic format file
is organized by feature type, contains only minimal
descriptive information about each line, and the
relationship between lines is unspecified. These files
are not topologically structured and contain no node or
area elements. The format and record content for the
l:2,000,000-scale graphics format is summarized in
Appendix 2-C.
Appendix 2-B
Optional DLG Distribution Format
In the optional DLG distribution format, topological linkages can
be explicitly encoded for node and area elements as well as for
line elements. The files are physically comprised of ASCII
characters organized into fixed-length logical records of 80
characters (bytes). Bytes 1-72 of each record contain DLG data,
and bytes 73-80 may be blank or contain a record sequence number.
The record types used in the optional DLG distribution format may
be categorized as header and data records.
The following are considered header records:
o File identification and description records (variable
record formats)
o Accuracy/miscellaneous records (not currently used)
o Control-point identification records
o Data-category identification records
The following are considered data records:
o Node and area identification records
o Node-to-area linkage records*
o Node-to-line linkage records
o Area-to-line linkage records
o Area-to-node linkage records*
o Line identification records
o Coordinate string records (lines)
o Coordinate string records (areas)*
o Attribute code records
o Text records (not currently used)
*Data distributed in optional format from the NDCDB will not
contain these data records.
The actual sequence of records in an optional distribution format
DLG file is as follows:
1. Header records
Ten file identification and
description records
Accuracy records (not currently used)
Control point identification records
(one per control point)
Data category identification records
(one per data category in the file)
2. Data records
Node identification record
Node-to-area linkage record(s)* Repeated
Node-to-line linkage record(s) for each
Attribute code record(s) node within a
Text record(s) data category
Area identification record
Area-to-node linkage record(s)* Repeated
Area-to-line linkage record(s) for each
Coordinate string record(s)* area within a
Attribute code record(s) data category
Text record(s)
Line identification record Repeated
Coordinate string record(s) for each
Attribute code record(s) line within a
Text record(s) data category
*Data distributed in optional format from the NDCDB will not
contain these records.
Descriptions of the contents of the various types of records in an
optional distribution format DLG are contained in the following
tables.
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte* Comment
______________________________________________________________________________
______________________________________________
1 1 Banner ALPHA A72 1
72 " *** DLG-OPTIONAL FORMAT
PRODUCED BY USGS PROSYS
RELEASE x.x.x *** "
2 1 Name of digital ALPHA A40 1
40 The name of the digital data
cartographic unit
cell followed by the State
two-character designators,
separated by hyphens.
--- --- Filler --- -- 41
41 1 space
2 2 Date of original ALPHA A10 42
51 Year of original source
source material
material followed by
latest revision date if
applicable; for example,
1956, 1965.
2 3 Date qualifier ALPHA A1 52
52 Qualifier to discriminate
revision date if present.
(P=photorevision, I=photo-
inspection, L=limited
revision, D=digital revision).
2 4 Scale of original INTEGER*4 I8 53
60 Scale denominator of source
source material
material; for example, 24000,
100000, or 2000000.
(Record 2, data element 5 and Record 3, data elements 1 through 18 apply to 24K
and 100K data files only. These fields
contain filler in 2M data files.)
--- --- Filler --- --- 61
63 3 spaces
*The logical record length for the optional distribution format is 80 bytes, with
8 spaces of blank fill in bytes 73-80
of each record which may be used for a record sequence number.
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS-continued
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
2 5 Sectional indicator ALPHA --- 64
66 Codes S, F, or T for
(100K files)
size of section, plus
sequence number.
--- --- Filler --- --- 67
72 6 spaces
--- --- Filler --- --- 1
41 41 spaces
3 1 Largest primary ALPHA A4 42
45 Largest primary contour
contour interval
interval, followed by the
interval unit (1=feet,
2=meters). Present only if
two or more primary
intervals exist. (selected
categories)
3 2 Comma ALPHA A1 46
46 comma separator
3 3 Largest primary ALPHA A4 47
50 Largest primary bathy-
bathymetric contour
metric interval, followed
interval
by the interval unit (1=feet,
2=meters, 3=fathoms).
Present only if two or more
primary intervals exist.
(selected categories)
--- --- Filler --- -- 51
51 1 space
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
3 4 Smallest primary ALPHA A4 52
55 Smallest or only primary
contour interval
contour interval, followed
by the interval unit as
described above (selected
categories).
3 5 Comma ALPHA A1 56
56 comma separator
3 6 Smallest primary ALPHA A4 57
60 Smallest or only primary
bathymetric contour
bathymetric contour interval,
interval
followed by the interval
unit as described above
(selected categories).
3 7-9 Coded Flags ALPHA A1 61
63 3 flags for future use
3 10 Coded Flag ALPHA A1 64
64 Database coded edge flag
for internal NMD use.
3 11 EDGEWS ALPHA A1 65
65 Status flag for west edge,
values are: b=unchecked,
0=passed, 1=alignment
discontinuity, 2=attribute
discontinuity, 3=attribute
and alignment discontinuity.
3 12 EDGEWR ALPHA A1 66
66 Reason for EDGEWS, values
are: b=no problem, 4=
adjacent data do not exist,
5=adjacent data unavailable,
6=graphic discontinuity,
7=graphic mismatch valid,
8=paneling unauthorized.
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
3 13 EDGENS ALPHA A1 67
67 Status flag for north edge,
values are b,0,1,2, or 3 as
above.
3 14 EDGENR ALPHA A1 68
68 Reason for EDGENS, values
are b,4,5,6,7 or 8 as above.
3 15 EDGEES ALPHA A1 69
69 Status flag for east edge,
values are b,0,1,2, or 3
as above.
3 16 EDGEER ALPHA A1 70
70 Reason for EDGEES, values
are b,4,5,6,7 or 8 as above.
3 17 EDGESS ALPHA A1 71
71 Status flag for south edge,
values are b,0,1,2, or 3
as above.
3 18 EDGESR ALPHA A1 72
72 Reason for EDGESS, values
are b,4,5,6,7 or 8 as above.
4 1 DLG level code INTEGER*2 I6 1
6 * Code=3, DLG-3
4 2 Code defining ground INTEGER*2 I6 7
12 * 1Code=1 UTM (24K and 100K),
planimetric reference
Code=3 Albers Conical Equal
system
Area (2M files)
4 3 Code defining zone in INTEGER*2 I6 13
18 * 1Code for appropriate UTM
ground planimetric
zone (24K or 100K files),
reference system
Code=9999 for 2M files
1See General Purpose Transformation Package software documentation for additional
information.
* Listed values reflect current NMD standard.
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
4 4 Code defining units INTEGER*2 I6 19
24 * 1Code=2, meters
of measure for ground
planimetric coordinates
throughout the file
4 5 Resolution REAL*4 D18.11 25
42 The true ground distance
corresponding to 0.001 inch
at map scale.
Scale Resolutions
1:24,000 0.61 M
1:25,000 0.635 M
1:48,000 1.22 M
1:62,500 1.587 M
1:63,360 1.61 M
1:100,000 2.54 M
1:250,000 6.35 M
1:2,000,000 50.80 M
4 6 Number of file-to- INTEGER*2 I6 43
48 number=4
map transformation
parameters
4 7 Number of accuracy/ INTEGER*2 I6 49
54 Currently=0, none included
miscellaneous records
4 8 Number (n) of INTEGER*2 I6 55
60 n=4 These points are
control points
usually, but not
always, a definition
of the file coverage.
1See General Purpose Transformation Package software documentation for additional
information.
* Listed values reflect current NMD standard.
______________________________________________________________________________
______________________________________________
FILE IDENTIFICATION AND DESCRIPTION
RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
4 9 Number (q) of categories INTEGER*2 I6 61
66 * q=1
in the DLG file
4 10 Horizontal Datum INTEGER*2 I3 67
69 Horizontal Datum of DLG
'b' or 0 = NAD 27
1 = NAD 83
2 = Puerto Rico
3 = Old Hawaiian
4 = Local (Astro)
4 11 Vertical Datum INTEGER*2 I3 70
72 Vertical Datum of DLG
'b' or 0 = NGVD 29
1 = NAVD 88
2 = Local Mean Sea
Level
5-9 1 Projection parameters REAL*8 3D24.15 1
72 Three parameters on each of
for map transformation
5 records (see Appendix 2-4).
10 1 Internal file-to- REAL*4 4D18.11 1
72 X, Y coordinates resulting
map projection
from this transformation will
transformation
be expressed in the appro-
parameters
priate ground planimetric
coordinate system. If the
x, y coordinates are already
in the ground coordinate
system, the projection para-
meters will be: A1=1.0,
A2=0.0, A3=0.0, and A4=0.0.
* Listed values reflect current NMD standard.
______________________________________________________________________________
______________________________________________
CONTROL POINT IDENTIFICATION RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1-n 1 Control-point label ALPHA A6 1
6 "SW," "NW," "NE," or "SE"
for four quadrangle
corners. Field is padded
with trailing blanks.
2 Latitude REAL*4 F12.6 7
18 In degrees and decimal
degrees.
3 Longitude REAL*4 F12.6 19
30 In degrees and decimal
degrees.
Filler 31
36 6 spaces
4 X coordinate REAL*4 F12.2 37
48 In units in the appropriate
zone of the ground plani-
metric coordinate system.
5 Y coordinate REAL*4 F12.2 49
60 In units in the appropriate
zone of the ground plani-
metric coordinate system.
--- --- Filler --- --- 61
72 12 spaces
______________________________________________________________________________
______________________________________________
DATA CATEGORY IDENTIFICATION RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1-q 1 Category name ALPHA A20 1
20 The first 4 characters are
unique to USGS/NMD data.
2 Attribute format codes INTEGER*2 I4 21
24 Blank or zero (0) indicates
default (2I6) attribute
formatting in major-minor
pairs.
3 Highest node INTEGER*2 I6 25
30 Number of nodes referenced
identification number.
in the file.
4 Actual number of INTEGER*2 I6 31
36 Only if the DCF is not
nodes in file
packed, and the element
ID numbers not compressed,
will this number be dif-
ferent from data element 3.
--- Filler --- --- 37
37 1 space
5 Presence of node-to- INTEGER*2 I1 38
38 *0=node-area list not
area linkage records
included, 1=node-area
list included.
6 Presence of node-to- INTEGER*2 I1 39
39 0=node-line list not
line linkage records
included, *1=node-line list
included.
--- Filler --- --- 40
40 1 zero or space
______________________________________________________________________________
______________________________________________
* Values marked are values from data distributed from the NDCDB.
______________________________________________________________________________
______________________________________________
DATA CATEGORY IDENTIFICATION
RECORDS--continued
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1-q 7 Highest area ID INTEGER*2 I6 41
46 Number of areas refer-
number.
enced in the file.
8 Actual number of areas INTEGER*2 I6 47
52 Only if the DCF is not
in file
packed, and the element ID
numbers not compressed,
will this number be different
from data element 7.
--- Filler --- --- 53
53 1 space
9 Presence of area-to- INTEGER*2 I1 54
54 *0=area-node list not
node linkage records
included, 1=area-node list
included.
10 Presence of area-to- INTEGER*2 I1 55
55 0=area-line list not
line linkage records
included, *1=area-line list
included.
11 Presence of area- INTEGER*2 I1 56
56 *0=area coordinates not
coordinate lists
included, 1=area coordinates
included
12 Highest line INTEGER*2 I6 57
62 Number of lines
identification number
referenced in the file.
______________________________________________________________________________
______________________________________________
* Values marked are values for data distributed from the NDCDB.
______________________________________________________________________________
______________________________________________
DATA CATEGORY IDENTIFICATION
RECORDS--continued
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1-q 13 Actual number of INTEGER*2 I6 63
68 Only if the DCF is not
lines in file
packed, and the element ID
numbers not compressed, will
this number be different from
data element 12.
--- Filler --- --- 69
71 3 spaces
14 Presence of line- INTEGER*2 I1 72
72 0=line coordinates not
coordinate lists
included, *1=line coordinate
list included.
______________________________________________________________________________
______________________________________________
* Values marked are values for data distributed from the NDCDB.
______________________________________________________________________________
______________________________________________
NODE AND AREA IDENTIFICATION RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1 Record type ALPHA A1 1
1 "N" or "A"
2 Element internal INTEGER*2 I5 2
6 Number is positive and seq-
ID number
uential from 1-n within each
element type, where n is the
highest element ID number.
3 Coordinates of node REAL*4 2F12.2 7
30 The area point is usually,
point or representative
but not always within the
point for area
polygon it represents.
4 Number of elements in INTEGER*2 I6 31
36
an area list (for nodes),
or a node list (for areas)
5 Number of elements in INTEGER*2 I6 37
42 Number of line segments that
line list
intersect at the node or, for
areas, line segments plus
number of islands.
6 Number of x,y or INTEGER*2 I6 43
48 For area records only,
lat-long points in
blank for node records.
area-coordinate list
7 Number of attribute INTEGER*2 I6 49
54
code pairs listed
8 Number of text INTEGER*2 I6 55
60 Zero (0). There are no
characters listed
text attributes for DLG data.
9 Number of islands INTEGER*2 I6 61
66 For area records only, blank
within area
for node records.
--- --- Filler --- --- 67
72 6 spaces
NODE-TO-AREA LINKAGE RECORDS
FORTRAN FORMAT (12I6), for each node: The list consists of area internal ID
numbers (which appear in bytes 2-6 of the area
identification records) of all the areas that are adjacent to that node. There
is no logical order to the list.
NODE-TO-LINE LINKAGE RECORDS
FORTRAN FORMAT (12I6), for each node: The list consists of line internal ID
numbers (which appear in bytes 2-6 of the line
identification records) of all the lines that connect to that node. The lines
that begin at this node are included in the list
as positive ID numbers. The lines which terminate at this node are included as
negative ID numbers. There is no logical order
to the list.
AREA-TO-NODE LINKAGE RECORDS
FORTRAN FORMAT (12I6) for each area: The list consists of node internal ID
numbers (which appear in bytes 2-6 of the node
identification records) of all nodes that are adjacent to that area. For those
areas with islands, the number zero, used as a
delimiter, marking the beginning of each island sublist. The format of this list
is the same as the Area-Line list below.
AREA-TO-LINE LINKAGE RECORDS
FORTRAN format (12I6), for each area: The list consists of line internal ID
numbers (which appear in bytes 2-6 of the line
identification records) of all lines that bound that area and lines which are
adjacent to an area. For those areas with islands
(indicated by bytes 61-66 of the area's first record), the number zero, used as
a delimiter, marking the beginning of islands.
Lines with this area to the right are included as positive ID numbers. Lines
with this area to the left are included as negative
ID numbers. The list is ordered clockwise around the perimeter of the area and
counterclockwise around each island, if any
(counterclockwise around an island of an area is still a clockwise direction in
reference to the area itself). The number zero
is inserted in the list before each island sublist. Lines that do not contribute
to the effective boundary of the area (those
having both their area left and area right assigned to the same area) are not
considered bounding lines. Therefore, these lines,
while still present in the file, will not be referenced in the area-to-line
linkage records.
______________________________________________________________________________
______________________________________________
LINE IDENTIFICATION RECORDS
______________________________________________________________________________
______________________________________________
Record Data Type
Starting Ending
Number Element Contents (Fortran Notation) Format Byte
Byte Comment
______________________________________________________________________________
______________________________________________
1 Record type A1 1
1 "L"
2 Element internal ID number I5 2
6 Number is positive and seq-
uential from 1-n within each
element type, where n is the
highest element ID number.
3 Starting node I6 7
12 Internal ID number. Refers
to data element 2 of the
node identification record.
4 Ending node I6 13
18 Internal ID number. Refers
to data element 2 of the
node identification record.
5 Left area I6 19
24 Internal ID number. Refers
to data element 2 of the
area identification record.
6 Right area I6 25
30 Internal ID number. Refers
to data element 2 of the
area identification record.
--- Filler --- 31
42 12 spaces
7 Number of x,y coordinate I6 43
48 Number of coordinate
pairs listed
pairs listed.
8 Number of attribute I6 49
54
code pairs listed
9 Number of text characters listed I6 55
60 Zero (0). There are no text
attributes for DLG data.
LINE COORDINATE STRING RECORDS
FORTRAN format (3(2F12.2)): The coordinates are in appropriate units in the
designated ground planimetric coordinate system
(usually meters in UTM), or in internal file units.
CODE RECORDS
As major-minor code attribute pairs, FORTRAN format (6(2I6)): Within each pair,
the first integer is the major code and the second
integer is the minor code. Each major and minor code is a one-to-four-digit
integer, right justified within the six-byte field.
AREA COORDINATE STRING RECORDS
FORTRAN FORMAT (3(2F12.2)): The last data element in the area identification
record contains the number of islands within the area.
If this number is greater than zero, the following convention applies to the Area
Coordinate list:
The coordinates of the outside boundary of the area are listed first. The
first coordinate of the outside boundary is
repeated to signal the closure of this ring. Next, the coordinates of one
of the islands are listed. The first coordinate
of this boundary is repeated, again signaling the end of this ring. Next,
the first coordinate of the outside boundary
is listed as a ring delimiter. This process is repeated until the
coordinates of the boundaries of all the islands are
listed. The coordinates in this list are ordered so that the area being
referenced is always to the right of the boundary
described by the sequence of coordinates. Therefore, the list is ordered
clockwise around the perimeter of the area and
counterclockwise around each island, if any. The common coordinates
between adjacent ring lines are only listed once,
except for the beginning and ending of a ring.
EXAMPLE 1: (A diagram illustrating this example may be found following the
text.)
Area line list (for area 41): 10, 11, -12, 0, 14, -15, 0, -18, 0, -82, -84, 21
Area node list (for area 41): 30, 31, 32, 0, 33, 34, 0, 35, 0, 36, 77, 76
Area coordinate list explanation:
o Outside ring coordinates:
(20, 50), (40, 60), (60, 50), (70, 40), (60, 20), (40, 10), (30, 10),
(20, 30), (10, 40), (20, 50) starting point
[ ( ] [ )
] of outside ring
L10 L11
L12 separate rings)
o 1st island ring coordinates:
(25, 45), (28, 39), (34, 43), (34, 48), (30, 50), (25, 45), (20, 50)
ring closes first coordinate
[ ( ] )
itself in outside ring
L14 L15
delimiter
o next island ring coordinates:
(30, 30), (30, 20), (40, 20), (40, 30), (30, 30), (20, 50) ring
delimiter
[ ]
L18
o last island ring coordinates:
(50, 40), (50, 30), (48, 22), (58, 24) (60, 35), (55, 45), (50, 40), (20,
50) ring delimiter must be
[ ( ] [ ) ]
present at end of list if
L82 L84 L21
islands are present.
Note: Since lines 80, 85, and 86 have area 41 as both their area left and area
right, they are not considered
"boundaries" of area 41. Therefore, they are not used to build the area
line list, area node list,
or area coordinate list for this area.
Complete area coordinate list:
(20, 50), (40, 60), (60, 50), (70, 40), (60, 20), (40, 10), (30, 10), (20, 30),
(10, 40), (20, 50),
(25, 45), (28, 39), (34, 43), (34, 48), (30, 50), (25, 45), (20, 50),
(30, 30), (30, 20), (40, 20), (40, 30), (30, 30), (20, 50),
(50, 40), (50, 30), (48, 22), (58, 24), (60, 35), (55, 45), (50, 40), (20, 50)
National Mapping Program
Technical Instructions
Part 3
Attribute Coding
Standards for
Digital Line Graphs
(Current version containing all changes through 4/7/94)
Department of the Interior
U.S. Geological Survey
National Mapping Division
CONTENTS
Page
3. Attribute Coding . . . . . . . . . . . . . . . . . . . . . . . 3-1
3.1 Objectives. . . . . . . . . . . . . . . . . . . . . 3-1
3.2 Symbol References . . . . . . . . . . . . . . . . . 3-3
3.3 Coding Structure. . . . . . . . . . . . . . . . . . 3-4
3.3.1 Major Code Description . . . . . . . . . . . 3-6
3.3.2 Minor Code Description . . . . . . . . . . . 3-8
3.3.3 Common Attribute Codes . . . . . . . . . . .3-10
3.4 Hypsography--Major code 020 . . . . . . . . . . . .3-15
3.4.1 General Principles . . . . . . . . . . . . .3-15
3.4.2 Node Attribute Codes . . . . . . . . . . . .3-17
3.4.3 Area Attribute Codes . . . . . . . . . . . .3-17
3.4.4 Line Attribute Codes . . . . . . . . . . . .3-17
3.4.5 Single-Point Attribute Codes . . . . . . . .3-21
3.4.6 General Purpose Attribute Codes. . . . . . .3-22
3.4.7 Descriptive Attribute Codes. . . . . . . . .3-22
3.4.8 Parameter Attribute Codes. . . . . . . . . .3-24
3.5 Hydrography--Major Code 050 . . . . . . . . . . . .3-26
3.5.1 General Principles . . . . . . . . . . . . .3-26
3.5.2 Node Attribute Codes . . . . . . . . . . . .3-32
3.5.3 Area Attribute Codes . . . . . . . . . . . .3-34
3.5.4 Line Attribute Codes . . . . . . . . . . . .3-43
3.5.5 Single-Point Attribute Codes . . . . . . . .3-46
3.5.6 General Purpose Attribute Codes. . . . . . .3-48
3.5.7 Descriptive Attribute Codes. . . . . . . . .3-60
3.5.8 Parameter Attribute Codes. . . . . . . . . .3-65
3.6 Vegetative Surface Cover--Major Code 070. . . . . .3-68
3.6.1 General Principles . . . . . . . . . . . . .3-68
3.6.2 Node Attribute Codes . . . . . . . . . . . .3-69
3.6.3 Area Attribute Codes . . . . . . . . . . . .3-69
3.6.4 Line Attribute Codes . . . . . . . . . . . .3-72
3.6.5 Single-Point Attribute Codes . . . . . . . .3-73
3.6.6 General Purpose Attribute Codes . . . . . .3-73
3.6.7 Descriptive Attribute Codes . . . . . . . .3-73
3.6.8 Parameter Attribute Codes . . . . . . . . .3-73
3.7 Non-Vegetative Features--Major Code 080 . . . . . .3-74
3.7.1 General Principles . . . . . . . . . . . . .3-74
3.7.2 Node Attribute Codes . . . . . . . . . . . .3-75
3.7.3 Area Attribute Codes . . . . . . . . . . . .3-75
3.7.4 Line Attribute Codes . . . . . . . . . . . .3-77
3.7.5 Single-Point Attribute Codes . . . . . . . .3-77
3.7.6 General Purpose Attribute Codes . . . . . .3-78
3.7.7 Descriptive Attribute Codes . . . . . . . .3-78
3.7.8 Parameter Attribute Codes . . . . . . . . .3-78
3.8 Boundaries--Major Code 090. . . . . . . . . . . . .3-79
3.8.1 General Principles . . . . . . . . . . . . .3-79
3.8.2 Node Attribute Codes . . . . . . . . . . . .3-82
3.8.3 Area Attribute Codes . . . . . . . . . . . .3-83
3.8.4 Line Attribute Codes . . . . . . . . . . . .3-88
3.8.5 Single-Point Attribute Codes . . . . . . . .3-90
3.8.6 Parameter Attribute Codes. . . . . . . . . .3-90
3.9 Survey Control and Markers--Major Code 150. . . . .3-92
3.9.1 General Principles . . . . . . . . . . . . .3-92
3.9.2 Node Attribute Codes . . . . . . . . . . . .3-95
3.9.3 Area Attribute Codes . . . . . . . . . . . .3-95
3.9.4 Line Attribute Codes . . . . . . . . . . . .3-95
3.9.5 Single-Point Attribute Codes . . . . . . . .3-97
3.9.6 General Purpose Attribute Codes. . . . . . .3-99
3.9.7 Descriptive Attribute Codes. . . . . . . . .3-99
3.9.8 Parameter Attribute Codes. . . . . . . . . .3-99
3.10 Transportation--Major Codes 170, 180, 190 . . . . 3-101
3.10.1 General Principles . . . . . . . . . . . . 3-101
3.10.2 Instructions for the Use of Attribute Codes
for Roads and Trails . . . . . . . . . . 3-111
3.10.3 Instructions for the Use of Attribute Codes
for Railroads. . . . . . . . . . . . . . 3-133
3.10.4 Instructions for the Use of Attribute Codes
for Pipelines, Transmission Lines, and
Miscellaneous Transportation Features. . 3-143
3.11 Manmade Features--Major Code 200. . . . . . . . . 3-153
3.11.1 General Principles . . . . . . . . . . . . 3-153
3.11.2 Node Attribute Codes . . . . . . . . . . . 3-159
3.11.3 Area Attribute Codes . . . . . . . . . . . 3-159
3.11.4 Line Attribute Codes . . . . . . . . . . . 3-166
3.11.5 Single-Point Attribute Codes . . . . . . . 3-170
3.11.6 General Purpose Attribute Codes . . . . . 3-173
3.11.7 Descriptive Attribute Codes . . . . . . . 3-189
3.11.8 Parameter Attribute Codes. . . . . . . . . 3-192
3.12 U. S. Public Land Survey System--Major Code 300 . 3-193
3.12.1 Background . . . . . . . . . . . . . . . . 3-193
3.12.2 General Principles . . . . . . . . . . . . 3-194
3.12.3 Node Attribute Codes . . . . . . . . . . . 3-200
3.12.4 Area Attribute Codes . . . . . . . . . . . 3-208
3.12.5 Line Attribute Codes . . . . . . . . . . . 3-234
3.12.6 Single Point Attribute Codes . . . . . . . 3-239
3.12.7 Parameter Attribute Codes . . . . . . . . 3-239
3.12.8 Irregular Rectangular Surveys in Ohio &
Indiana . . . . . . . . . . . . . . . . 3-241
FIGURES
Figure Page
3-1 Attribute and parameter coding for hydrography
coincident with vegetative surface cover . . . . . . .3-39
3-2 Attribute and parameter coding for woods, submerged
woods, wooded swamp and submerged wooded swamp . . . .3-71
TABLES
Table Page
3-1 Summary of attribute code changes . . . . . . . . . . . 3-5
3-2 Current major attribute codes . . . . . . . . . . . . . 3-7
3-3 Origins of the U.S. rectangular surveys . . . . . . . 3-211
3-3a Origins of U.S. private surveys in Ohio . . . . . . . 3-213
3-4 Township duplicates . . . . . . . . . . . . . . . . . 3-216
3-5 Named land grant codes. . . . . . . . . . . . . . . . 3-220
(Current version containing all changes through 11/15/93)
3.1 OBJECTIVES
Digital cartographic data produced by the National Mapping
Program are intended to support the requirements of a
broad spectrum of users, not only for traditional
cartographic products, but also for input to geographic
information systems, for the production of graphics, and
for automated spatial analyses. The data are collected in
logical categories that comprise unique themes, not
necessarily corresponding to traditional feature
separates.
Attribute codes, also called feature codes or
classification attributes, are used to describe the
physical and cultural characteristics of digital line
graph (DLG) data elements: nodes, areas, and lines. Part
3 describes the general characteristics of the DLG coding
scheme, defines the attribute codes used in each DLG data
category, and provides guidance for the standardized
application of these codes in the digitizing process.
In the initial effort of building the DLG data base, the
primary source materials used for data collection are
published 1:24,000-, 1:25,000-, and 1:100,000-scale
topographic maps. Field notes, aerial photographs, and
compilation materials are not normally used directly. It
is therefore necessary to prescribe the use of attribute
codes based on information depicted on published maps.
Every standard cartographic symbol will have an attribute
code number, although there are situations where more than
one attribute code will be required to fully describe a
feature. The DLG file will reflect the level of detail or
feature generalization of the source map. Therefore, many
of the attribute codes are scale dependent and may not
apply to a given source.
Attribute codes are formulated according to the following guidelines:
o Minimize redundant information.
Generally, attribute codes are not assigned to a
feature if they can be derived from relationships to
adjacent features. For example, in the U.S. Public
Land Survey System (PLSS) category, township extremity
lines are not explicitly coded because this attribute
can be derived by examining the attributes of the two
areas that bound each line.
o Provide sufficient reference information to support
integration with large, multipurpose data bases.
Many organizations maintain sets of mission-specific
thematic or statistical data that are combined with
cartographic base categories for both display and
analysis. The DLG attribute coding scheme attempts to
facilitate this process by the support of a variable
number of attributes assigned to each feature, which
creates an open-ended structure to which a user may
add information, and by the use of established Federal
Information Processing Standard (FIPS) codes, where
available.
o Describe the interrelations between cartographic
elements.
The interrelationships between cartographic elements
are expressly encoded where appropriate.
For example, the "right bank" and "left bank" of a
river are designated rather than "bank" so that the
direction of flow can be determined. A node is coded
at the beginning of a single line stream for the same
reason.
3.2 SYMBOL REFERENCES
When an attribute code is specifically related to a
standard cartographic symbol, the symbol number is cited.
Symbol numbers refer to the following National Mapping
Program Technical Instructions:
(A) Standards for 1:24,000- and 1:25,000-Scale Quadrangle
Maps, Part 6: "Publication Symbols (Supplement)" -
December 1981.
(B) Standards for 1:100,000-Scale Quadrangle Maps, Part 4:
"Publication Symbols" - May 1984.
(C) Standards for 1:24,000- and 1:25,000-Scale Quadrangle
Maps, Part 5: "Publication Symbols" - May 1984.
(D) Standards for Provisional Edition Maps, 1:24,000- and
1:25,000-Scale, Part 2: "Compilation Symbols" -
January 1982.
In reference A the symbol number is cited. In references
B and C, the feature separate number and item number are
attached to form a symbol number, for example, 145.2. In
reference D, the section number and item number are
attached to form a symbol number, for example, 2103.01.
Throughout Part 3, each symbol number cited will have the
reference letter in parentheses after it, for example,
207(A), 145.2(B), 512.61, 545.5 (C), or 2103.01(D). When
a symbol has been eliminated from the Technical
Instructions, it may be referred to as an "old" symbol,
for example, old symbol 512.57(C).
3.3 CODING STRUCTURE
Each attribute code identifies the general data category
to which a feature belongs, as well as the specific nature
of the feature. Codes also provide additional descriptive
information. Many features are uniquely described by a
single attribute code. Others may require two or more
codes for a complete description. If multiple attributes
are needed to describe a feature, their ordering is not
significant, except in the case of highway route numbers.
It is not necessary for each element to have associated
attributes.
A DLG attribute code is composed of two distinct numeric
fields: a three digit major code, the first two digits of
which identify the data category to which the feature
belongs, and a four digit minor code, which specifically
describes the feature.
This document supersedes "Computer Files and Attribute
Codes for Digital Line Graphs" (January 1980, revised
February 1982) as well as National Mapping Program Data
Users Guide 1, "Digital Line Graphs from 1:24,000-scale
Maps" (1990), National Mapping Program Data Users Guide 2:
"Digital Line Graphs from 1:100,000-scale Maps" (1989),
and National Mapping Program "Digital Line Graph Attribute
Coding Standards" (1985) in defining attribute codes to be
used for DLG's. In this document, some data category
names are changed. Also, some attribute codes replace
previously defined codes, some are newly defined, and some
are modified. All are explained in greater detail than in
the previous documents. The changes are summarized in
Table 3-1 by major code. In the categories where the
major code was changed, the minor codes were changed.
Table 3-1
Summary of attribute code changes
Current Prior Category Type of Change
major major
code code
020 020 Hypsography Replacement of minor
codes
--- 030 Streams Included in 050
Hydrography
--- 040 Water Bodies Included in 050
Hydrography
--- 050 Wetlands Included in 050
Hydrography
--- 060 Coastal Features Included in 050
Hydrography
050 --- Hydrography Newly defined
070 --- Vegetative Surface
Cover Newly defined
080 --- Non-Vegetative
Features Newly defined
090 090 Boundaries Expanded codes,
definitions
150 --- Survey Control
and Markers Newly defined
170 100 Roads and Trails Replacement
180 110 Railroads Replacement
--- 120 Water Navigation Included in 050
Hydrography
190 130 Pipelines,
Transmission Lines,
and Miscellaneous
Transportation
Features Replacement
200 140 Manmade Features Replacement
300 --- U.S. Public Land
Survey System (PLSS) Expanded codes,
definitions
3.3.1 Major Code Description
The first two digits of the major code uniquely identify
the data category to which the described element belongs.
Table 3-2 lists currently used major codes and the
categories they represent.
The third digit of the major code is used to designate the
interpretation of the minor code in two ways:
o if it is zero, the minor code numbers represent a
description or classification of a specific
feature, for example, 050 0300, which identifies a
spring.
o if it is not a zero, the minor code numbers have
special interpretations as a parameter. The
interpretation to be applied is given for each
category. For example, 055 ---- is used to encode
the value of a river mile mark.
Table 3-2
Current major attribute codes
Major code Base category
020 Hypsography
050 Hydrography
070 Vegetative Surface Cover
080 Non-Vegetative Features
090 Boundaries
150 Survey Control and Markers
Transportation systems
170 Roads and Trails
180 Railroads
190 Pipelines, Transmission Lines, and
Miscellaneous Transportation
Features
200 Manmade Features
Nonbase Category
300 U.S. Public Land Survey System
3.3.2 Minor Code Description
The first digit of the minor code is normally zero. If it
is not a zero, the number is used as a modifier to provide
additional information about a feature. For example, code
302 0001 identifies township 1 north as a full township;
but code 302 4002 identifies township 2 north as a half
township in the PLSS.
The remaining three digits are normally used to classify
specific features. The type of element described by a
particular code can be determined from the value of these
digits:
o node: 001 - 099
o area: 100 - 199
o line: 200 - 299
o single-point (degenerate line): 300 - 399
o general purpose codes (apply to multiple feature
types):
400-499
o descriptive codes: 600-699
Exceptions to this scheme are discussed below as well as
noted in the specific code descriptions.
The general purpose codes are used on features that may be
digitized as a node, area, or line depending on the size
and position of the feature. The descriptive codes are
used with another code to qualify its meaning. General
purpose and descriptive attribute codes were added to the
coding scheme in 1982. They are, therefore, not used in,
or defined for, the two categories collected most heavily
before 1982, U.S. Public Land Survey System and
boundaries.
The last three digits of the minor codes may also be used
as a parameter code. Parameters are used when a minor
code can legitimately assume a range of values, for
example, water elevation or highway route number. The
meaning of a parameter code is derived from the (non zero)
third digit of the major code. Parameters are both
category and feature specific.
3.3.3 Common Attribute Codes
In general, the meaning of an attribute code is unique to
the feature it describes. There are, however, several
exceptions.
Outside area (000 0000)
Each DLG provides a coherent description of that portion
of the earth's surface covered by a 1:24,000-scale,
7.5-minute cell, or a specific subdivision of another
scale source. To maintain topological consistency and to
facilitate the combination (integration) of multiple
DLG's, the area outside the cell is specifically
identified for each DLG. This area element, which must be
the first area present in each data category, is assigned
a single attribute code with major and minor codes both
equal to zero.
Photorevised features (XX0 0000)
Map features obtained by photorevision methods are printed
in purple on 1:24,000- and 1:25,000-scale maps. They are
described by attribute codes from the appropriate
category. In addition, a code consisting of major code
XX0, where XX are the two digits uniquely identifying the
data category, and a minor code of zero, will also be
attached. The photorevised code can be applied to any
feature types but can not be used alone except as a line
code for a photorevised line in the Boundaries category.
For example:
a. A class 3 road added by photorevision would be coded
as follows:
170 0000 - obtained by photorevision
170 0209 - improved light duty
b. A boundary line added by photorevision would be coded
as follows:
090 0000 - obtained by photorevision
The photorevised code is not assigned to a node except
when the node represents a photorevised feature on the
map. For example, a lake or pond, 0.030 inch or less in
diameter with a drain attached, added by
photorevision is digitized as a node and coded as follows:
050 0000 - obtained by photorevision
050 0200 - shoreline
050 0421 - lake or pond
This code may also be used in conjunction with the best
estimate of position and (or) classification code, when
map features obtained by photorevision methods are printed
in purple on 1:24,000- and 1:25,000-scale maps but are not
labeled. For example, a class 3 or 4 road that does not
appear to be a part of the road network might be coded as
follows:
200 0000 - obtained by photorevision
200 0214 - racetrack or drag strip
208 0000 - best estimate of position or classification
Best estimate of position and (or) classification (XX8
0000)
The attribute code consisting of major code XX8, where XX
are the two digits uniquely identifying the data category,
and a minor code of zero indicates that the position and
(or) classification of the feature is not sufficiently
clear to warrant unqualified use of the attribute code
assigned.
Coincident feature (XX9 00YY)
The attribute code having major code XX9, where XX are the
two digits uniquely identifying the data category, is used
to indicate that the digitized feature occupies the same
position as a feature from another data category. The
second category is identified by the last two digits in
the minor code. YY are the first two digits of the major
code of the second category. For example:
309 0009 - land line coincident with boundary
099 0017 - boundary coincident with road
099 0002 - boundary coincident with watershed divide
In most cases the lines where features are coincident are
shown on the published map, however, land lines are
omitted where they coincide with features of higher
order symbolization, such as civil boundaries, roads,
levees, or canals.
These codes are included primarily as an aid in vertical
integration of data from several categories. Specific
instructions applicable to a given category of data appear
in the code descriptions for that category.
Processing line (XX0 0299)
The attribute code consisting of major code XX0, where XX
are the two digits uniquely identifying the category, and
a minor code of 0299, indicates that a digitized line has
segmented the data within a file for processing. For
example:
050 0299 - Processing line code for hydrography
This code is included primarily as an aid in the
processing of large files that exceed the limitations of
routines within the processing system (PROSYS).
This sheet represents pages 3-13, which is blank
(Current version containing all changes through 11/15/93)
3.5 HYDROGRAPHY--MAJOR CODE 050
3.5.1 General Principles
The purpose in digitizing hydrography is to collect
information about streams, bodies of water, wetlands,
coastal water, and water used for transportation and
related hydrographic features in a manner that permits the
extraction and derivation of data to suit the needs of the
data users. This information is not collected for
specific hydrologic studies or for navigational
assistance.
One intention in collecting hydrography is to capture the
direction of the flow by theoretically looking downstream
and indicating right and left banks. Where the flow
direction of a stream cannot be determined from the source
material, the adjoining quadrangles are examined to obtain
the information. If the directional flow still cannot be
determined, the nodes and (or) banks are not coded to
indicate flow.
All double line streams are digitized as areas. Double
line streams that join another double line stream or a
water body are closed by an arbitrary closure line.
The description of hydrographic features uses all of the
types of codes: node, area, line, single-point, general
purpose, and descriptive.
All hydrographic features that have attribute codes
assigned are assumed to be perennial unless the attribute
code for "intermittent" is also assigned.
Hydrographic features do not carry attribute codes for
information that can be derived, such as intersections and
junctions. This means that there will be unattributed
nodes, areas, and lines.
When an area feature, which can be identified by a code,
is subdivided by linear features or closure lines, each
resultant smaller area is identified by the appropriate
code.
The background land area is not assigned an attribute
code. In some cases, land occurs as a brown area 0.030
inch in diameter or smaller. This is digitized as a
degenerate line with the appropriate shoreline code.
3.5.1.1 Hydrography Attribute Codes
The attribute codes used in digitizing hydrographic
information are listed in this section. Instructions for
the use of the attribute codes are given in sections 3.5.2
through 3.5.8.
o Node attribute codes
050 0001 Upper origin of stream
050 0002 Upper origin of stream at water body
050 0003 Sink, channel no longer evident
050 0004 Stream entering water body
050 0005 Stream exiting water body
o Area attribute codes
000 0000 Outside area
050 0100 Alkali flat
050 0101 Reservoir
050 0102 Covered reservoir
050 0103 Glacier or permanent snow field
050 0104 Salt Evaporator
050 0105 Inundation area
050 0106 Fish hatchery or farm
050 0107 Industrial water impoundment
050 0108 Area to be submerged
050 0109 Sewage disposal pond or filtration plant
050 0110 Tailings pond or settling basin
050 0111 Marsh, wetland, swamp, or bog
050 0112 Mangrove area
050 0113 Rice field
050 0114 Cranberry bog
050 0115 Flats (tidal, mud, sand, or gravel)
050 0116 Bays, estuaries, gulfs, oceans, or seas
050 0117 Shoal
050 0118 Soda evaporator
050 0119 Duck pond
050 0120 Void area
050 0121 Obstruction area in water area
o Line attribute codes
050 0200 Shoreline
050 0201 Manmade shoreline
050 0202 Closure line
050 0203 Indefinite shoreline
050 0204 Apparent limit
050 0205 Outline of a Carolina bay
050 0206 Danger curve
050 0207 Apparent shoreline
050 0208 Sounding datum
050 0209 Low-water line
050 0299 Processing line
o Single-point attribute codes (degenerate lines)
050 0300 Spring
050 0301 Nonflowing well
050 0302 Flowing well
050 0303 Riser
050 0304 Geyser
050 0305 Windmill
050 0306 Cistern
o General purpose attribute codes (apply to nodes,
areas, lines, or degenerate lines)
050 0400 Rapids
050 0401 Falls
050 0402 Gravel pit or quarry filled with water
050 0403 Gaging station
050 0404 Pumping station
050 0405 Water intake
050 0406 Dam or weir
050 0407 Canal lock or sluice gate
050 0408 Spillway
050 0409 Gate (flood, tidal, head, or check)
050 0410 Rock
050 0411 Crevasse
050 0412 Stream
050 0413 Braided stream
050 0414 Ditch or canal
050 0415 Aqueduct
050 0416 Flume
050 0417 Penstock
050 0418 Siphon
050 0419 Channel in water area
050 0420 Wash or ephemeral drain
050 0421 Lake or pond
050 0422 Coral reef
050 0423 Sand in open water
050 0424 Spoil area, dredged area, or dump area
050 0425 Fish ladders
050 0426 Holiday area
o Descriptive attribute codes
050 0601 Underground
050 0602 Overpassing
050 0603 Elevated
050 0604 Tunnel
050 0605 Right bank
050 0606 Left bank
050 0607 Under construction
050 0608 Salt
050 0609 Unsurveyed
050 0610 Intermittent
050 0611 Abandoned or discontinued
050 0612 Submerged or sunken
050 0614 Dry
050 0615 Mineral or hot (sulphur, alkali, and so
on)
050 0616 Navigable - transportation
050 0617 Underpassing
050 0618 Earthen construction
050 0619 Interpolated elevation
050 0621 - 0629 Decimal fractions of feet or
meters
o Parameter attribute codes
05N ---- Elevation of actual or interpolated
water surface
N = 1 for whole feet
= 2 for whole meters
= 6 for whole feet below datum
= 7 for whole meters below datum
Notes: a. Elevation value is flush right, four
digits.
b. To express elevations in decimal feet
or meters, use the above parameter
codes in conjunction with attribute
codes 050 0621 through 050 0629.
c. Elevations exceeding 9,999 feet
must be expressed in meters.
055 ---- River mile, value in four spaces, flush
right
050 0000 Photorevised feature
058 0000 Best estimate of classification or
position
059 00-- Coincident feature
3.5.2 Node Attribute Codes
The primary purpose of the node attribute codes is to
assist in determining the direction of water flow. In
assigning the node codes, the term "water body" refers to
any areal feature digitized in the hydrography category.
These codes apply to nodes found at the terminus of a
given single-line stream segment. Nodes are not coded at
connecting points where lines coded left and right bank
intersect other left and right bank lines. Nodes are not
coded where lines coded left and right bank connect lines
bounding water bodies. Also nodes are not coded in places
where direction of flow cannot be determined.
050 0001 Upper origin of stream
This code identifies a node placed at the
true beginning of a stream, where it is
first shown. It is not used to mark stream
junctures, even though the name of the
stream changes, or to mark streams that
exit from a water body.
050 0002 Upper origin of stream at water body
This code identifies a node placed where a
stream originates either within the limits
of or at the point of exit from a water body.
It is not used to identify any subsequent
exits from water bodies further downstream.
050 0003 Sink
A sink is the definite point where a stream flows
underground, shown by symbols 407(A), 141.8(B),
541.12(C), or 2202.04(D). This code is used to
identify a node placed at the point of
disappearance. This code is not used to identify
points where streams enter manmade features, such
as aqueducts or siphons, or where streams enter
and subsequently exit water bodies.
050 0004 Stream entering water body
This code identifies a node placed at the
terminus of a single-line stream segment where it
ends within the limits of or at the perimeter of
a water body.
050 0005 Stream exiting water body
This code identifies a node placed at the
terminus of a single-line stream segment where it
begins within the limits of or at the perimeter
of a water body, other than at an upper origin of
a stream.
3.5.3 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
050 0100 Alkali flat
This code identifies a point placed within an
area shown by symbols 450(A), 141.16(B),
541.28(C), or 2203.08(D) and labeled.
050 0101 Reservoir
This code identifies an area point placed in a
reservoir shown by symbols 179, 413 (A); 112.6,
141.12, 141.13, 145.2 (B); 512.61, 541.24 (C); or
2203.09(D) that is labeled or named as a
reservoir. Use code 050 0200 for identification
of natural shoreline around symbols 413, 141.12,
141.13, or 2203.09, and code 050 0201 for
manmade shoreline around symbols 179 or 145.2.
If the symbol is 0.030 inch or less in diameter,
digitize as a degenerate line or node and add the
shoreline code. This code is not used to
identify features related to sewage treatment,
fish farming, or water filtration.
050 0102 Covered reservoir
This code identifies a point placed in a
reservoir area shown by symbol 180(A); 512.62,
545.6 (C); or 2106.08(D) and named or labeled as
a reservoir. If the symbol is 0.030 inch or less
in diameter, digitize as a degenerate line or
node and add the shoreline code. Use code 050
0201 for identification of manmade shoreline of
this feature. This code does not apply to
1:100,000-scale maps.
050 0103 Glacier or snowfield
This code identifies a point placed in an area
depicted by symbols 428, 429, 430 (A); 141.27,
141.28 (B); 541.43 through 541.45 (C); or
2205.04(D). Because the symbols vary because of
the contouring, which is not pertinent to the
hydrographic category, the same code is applied to
all three symbols. Any areas where the glacial
moraine pattern overlaps a glacier is coded
coincident with the Non-Vegetative Features
category (059 0008). The outline of the area is
not given an attribute code.
050 0104 Salt evaporator
This code identifies the points placed in each
section of areas shown by symbols 439(A),
141.15(B), 541.27(C), or 2205.10(D) and labeled.
The pattern of ditches is digitized and coded
(see code 050 0414).
050 0105 Inundation area
This code identifies a point placed in the area of
land between the normal operating level and the
high water line in reservoirs or lakes impounded
by dams. This area is shown by symbols 448(A),
141.38(B), 541.56 or 546.1 (C). Generally, code
the outer line as symbolized. However, on older
1:24,000-scale quads, if the outer line is shown
as an indefinite shoreline and the inundation area
is in a non-coastal area, then code the outer line
as intermittent shoreline (see code 050 0203 for
further explanation). If an area subject to
controlled inundation is symbolized with an
elevation value on the shoreline defining the
area, the elevation parameter code is added. Use
code 050 0412 or 050 0414 for identification of
drainage pattern in the area.
050 0106 Fish hatchery, fish farm, or fish pond
This code identifies a point placed in any area
shown by symbols 179(A); 112.6, 145.2 (B); 512.61,
545.5 (C); or 2205.11(D) and labeled. The label
may vary to indicate the species or the
controlling agency. The outline is coded
050 0201 if shown in black and 050 0200 if
shown in blue. The major ditches are coded
050 0414 if shown in blue or 050 0201
if shown in black. The fish pond, unique to maps
of Hawaii, may or may not be labeled. If the
outline is shown by a solid black line, the
outline is coded 050 0201; if shown by a dashed
black line also use code 050 0611 (abandoned) for
the area. In all cases, each section has a coded
area point placed in it.
050 0107 Industrial water impoundment
This code identifies a point placed in an area
that is shown by symbols 410(A), 141.12(B),
541.23(C), or 2203.03(D), and carries a label
that indicates the water is collected for
industrial use, such as "industrial waste pond"
or "cooling pond." This does not include the
features related to sewage treatment, fish
farming, water filtration, or mining.
050 0108 Area to be submerged
This code identifies a point placed in an area
shown by symbols 702(A), 141.39(B), 541.57, 547.2
(C), or 2203.07(D). The symbol depicts the
expected normal pool elevation. Generally, code
the outer line as symbolized. However, on older
1:24,000-scale quads, if the outer line is shown
as an indefinite shoreline, then code the outer
line as shoreline (see code 050 0203 for further
explanation). If an elevation value is shown on
the shoreline defining the area, the elevation
parameter code is added. Features within the
area are double coded (i.e., stream (050 0412),
area to be submerged (050 0108)). This area is
used when a dam is under construction and the
limits of the intended reservoir are known. 050 0109 Sewage disposal pond or filtration plant
This code identifies a point placed in any area
that relates to the treatment of sewage. These
features may be shown by symbols 410(A); 112.5,
141.12 (B); 512.59, 547.3 (C); or 2203.03,
2205.12, 2205.13 (D). The features are labeled in
various ways such as "sewage disposal pond" or
"filtration bed." This code is also applied to
ponds that are unlabeled but are shown by symbols
700(A), 147.3(B), or 2106.07(D) and are located
adjacent to a labeled sewage disposal plant. When
this symbol is 0.030 inch in diameter, digitize as
a degenerate line. Use code 050 0200 for blue
outlines or code 050 0201 for black outlines. On
1:100,000-scale maps the sewage disposal plant is
digitized by placing the area point in symbol
147.3(B). The outline shown by symbol 112.5(B) is
coded with 050 0201.
050 0110 Tailings pond or settling basin
This code identifies a point placed in an area
shown by symbols 323(A); 132.16, 134.2 (B);
532.22, 538.1 (C); or 2112.05(D); and labeled
"tailings pond" or "settling basin." Use code 050
0204 for outline of pond when it is limited by the
contour. Do not code the outline otherwise.
050 0111 Marsh, wetland, swamp, or bog
This code identifies a point placed in any area
shown by symbols 431(A), 143.1(B), 543.1(C), or
2205.05(D). If the area being digitized has no
definite outline shown, the edge of the pattern is
followed to delimit the area (see code 050 0204).
Any portion of a wetland that is overprinted with
blue as in symbols 433(A), 141.35, 143.2 (B),
543.2(C), or 2205.06(D), is digitized as a
separate area with the code assigned to indicate
that it is a marsh (050 0111) and is
submerged (050 0612). Any portion of a
wetland that is overprinted with green tint
to indicate it is wooded, as in symbols
432(A) or 543.03(B), is digitized as a
separate area with the code to
indicate that it is a swamp (050 0111) coincident
with Vegetative Surface Cover (059 0007). Any
portion of a wetland that is overprinted with
green\blue to indicate it is submerged wooded
swamp, as in symbols 543.4(B) or 141.37(B), is
digitized as a separate area with the code
assigned to indicate that it is a marsh (050
0111), submerged (050 0612), and coincident with
Vegetative Surface Cover (059 0007). The code
059 0007 does not apply to 1:100,000-scale maps
(see figure 3-1). Any streams shown in wetland
areas are digitized as separate features (see
code 050 0412).
050 0112 Mangrove area
This code identifies a point placed in an area
shown by symbols 437(A); 144.1, 152.4 (B); 544.1,
552.4 (C); or 2205.08, 2402.06 (D). If the
outline of the area is not clearly defined, the
edge of the pattern is followed to delimit the
area (see code 050 0204).
050 0113 Rice field
This code identifies a point placed in an area
shown by symbols 436(A), 548.1(C), or 2205.07(D).
If the outline of the area is not clearly defined,
the edge of the pattern is followed to delimit the
area (see code 050 0204). This code does not
apply to 1:100,000-scale maps.
Area Parameter
Area Feature attribute attribute
code code
1 Woods --- ---- ----
2 Submerged woods 050 0421** 059 0007*
(wooded lake)
3 Submerged wooded swamp 050 0111, 059 0007*
050 0612**
4 Wooded swamp 050 0111 059 0007*
5 Swamp 050 0111 ----
6 Submerged swamp 050 0111, ----
050 0612** ----
7 Lake 050 0421** ----
* This code does not apply to 1:100,000-scale maps.
** If area meets minimum size criteria, add interpolated elevation
attribute code and appropriate elevation value.
Figure 3-1
Attribute and parameter coding for hydrography coincident with
vegetative surface cover
050 0114 Cranberry bog
This code identifies a point placed in each
section of an area shown by symbols 438(A),
141.36(B), 541.49(C), or 2205.09(D) and labeled
"cranberry bog." There may be several cranberry
bogs in a group with one label "cranberry bogs."
Code the outer line intermittent shoreline (see
codes 050 0610 or 050 0200). The ditch pattern is
digitized as shown and coded intermittent ditch
(see codes 050 0610 or 050 0414).
050 0115 Flats (tidal, mud, sand, or gravel)
This code identifies a number of features that
fall into the general category of flats (e.g.,
foreshore flats, areas inside of rock reefs, and
the area between the shoreline and sounding datum
line on topographic-bathymetric editions). These
features are shown by symbols 232(A), 316(A),
517.1(C), or 2113.01(D). On topographic-
bathymetric editions, flats are shown by 135.7(B)
or 535.10(C). The area is usually labeled by
type, that is, mud, tidal, gravel, sand, or shell.
Do not include in this classification features
such as sand dunes, sand in open water (see 050
0423), or beach areas on dry land. Use code 050
0204 for the outline of an area that is not
otherwise symbolized with a shoreline feature.
050 0116 Bays, estuaries, gulfs, oceans, or seas
This code is used to identify a seaward area of
water. The inland extent is defined at the place
where a double-line stream reaches a width of l
nautical mile (6,080 feet) with no further
constrictions, if the conformation of the land and
water do not otherwise make the division obvious.
A closure line is placed to separate the bay,
estuary, gulf, ocean, or sea from a double-line
stream (050 0202). 050 0117 Shoal
This code identifies a shoal area shown by symbols
243(A), or 512.142(C) and labeled "Shoal." This
code does not apply to 1:100,000-scale maps.
050 0118 Soda evaporator
This code identifies an area shown by symbols
439(A), 141.15(B), 541.27(C), or 2205.10(D) and
labeled. On the 1:100,000-scale maps, symbol
141.15(B) with a blue dot or blue dash fill is
used. The pattern of ditches is digitized and
coded (see code 050 0414).
050 0119 Duck Pond
This code identifies an area labeled "Duck Pond."
This feature is shown by symbols 141.17, 146.2 (B)
or 541.29, 546.2 (C). Generally, code the outer
line as symbolized. However, on older 1:24,000-
scale quads, if the outer line is shown as an
indefinite shoreline, then code the outer line as
intermittent shoreline (see code 050 0203 for
further explanation). The ditch pattern is
digitized as shown and coded intermittent ditch
(see codes 050 0610 or 050 0414).
050 0120 Void area
This code identifies an area on the source where
hydrographic data do not exist or are interrupted
because of replacement by imagery or a pattern
from another category. A void area is also found
beyond the national boundary to distinguish it
from the background area. Where appropriate, the
perimeter of the void area, usually a closure
line, is coded as coincident with the category
whose pattern defines the hydrographic void area.
The closure line that defines the void area beyond
the national boundary is coded as coincident with
the Boundaries category (059 0009).
050 0121 Obstruction area in water area
This code identifies an obstruction area in a
water area shown with a double dashed line and
labeled "Pipelines obstruction area," "Cable
area," "Pipeline area," or "Cable-Pipeline area."
By definition, this denotes water area and
therefore the area is not double-coded. Arbitrary
closure lines are required to complete the
definition of an open-ended area. The limits of
the area are not otherwise coded. 3.5.4 Line Attribute Codes
050 0200 Shoreline
This code identifies a natural shoreline shown by
symbols 400(A), 141.1(B), 541.1(C), or 2203.01(D)
and islands larger than 0.030 inch in diameter.
The shoreline of an intermittent water body is
coded 050 0200 and 050 0610 (intermittent). This
code is also used to define the shorelines of
double-line streams and ditches when the direction
of flow cannot be determined (when direction of
flow can be accurately determined, use codes 050
0605 and 0606). This code is also used to
identify the shoreline of islands, lakes, and
reservoirs that are digitized as degenerate lines.
050 0201 Manmade shoreline
This code identifies the shoreline around or along
a body of water to indicate that the shoreline is
shown by a black outline. Where the shoreline is
broken by a single-line pier, wharf, or jetty, the
single-line feature is not digitized as part of
the manmade shoreline. This code is also used to
identify the shoreline of islands, lakes, and
reservoirs that are digitized as degenerate lines.
050 0202 Closure line
This code identifies a line segment digitized to
form the closure of an areal feature whose outline
is not explicitly symbolized. It is used, for
example, as a line between hydrographic areas to
retain the separate identity of each, such as
where a double-line stream enters a lake or bay.
This code also identifies a line segment used to
close gaps in streams where the symbol has been
broken. When this code is used as an arbitrary
extension, the primary code should be used also.
A closure line is used to define the extent of a
void area that is not otherwise symbolized.
050 0203 Indefinite shoreline
This code identifies a line shown by symbols 401,
415 (A); 141.3(B); 541.3(C); or 2203.02(D); which
indicates that the shoreline cannot be definitely
established. Note that on 1:24,000-scale quads
compiled using older Part 6 symbology an
indefinite shoreline was shown around hydrographic
features that are now shown with an intermittent
shoreline (intermittent ponds, dry lakes, duck
ponds, inundation areas in non-coastal areas) or
a shoreline (area to be submerged). On these
quads, code these lines as intermittent shoreline
or shoreline, not indefinite shoreline.
050 0204 Apparent limit
This code identifies a line digitized around
various fea-tures represented by an areal pattern
when a definite out-line does not exist. The edge
of the pattern (such as marsh or wash) is followed
as closely as possible and carries this code to
indicate the arbitrary nature of the line.
050 0205 Outline of a Carolina bay
This code identifies a line shown by symbols
401(A), 141.7(B), 541.17(C), or 2205.19(D). The
feature is outlined by a dashed blue line and is
noted on the map collar. Any other hydrologic
feature within the area of a Carolina bay, such as
marsh, lake, or ditch, is digitized as a separate
feature. If a bay outline is a complete and
closed ellipse, the interior area does not have an
attribute code unless it is a hydrologic feature
in its own right.
050 0206 Danger curve
This code identifies a line shown by symbol
244(A), which represents the limit of an area
considered to be dangerous for navigation.
050 0207 Apparent shoreline
This code identifies a line shown by symbols
141.2(B) or 541.2(C), which represents a coastal
shoreline in areas of marsh, grass, mangrove, or
other similar marine vegetation. This symbol is
shown at the outer edge of vegetation, instead of
the mean high-water line, and is used with
topographic-bathymetric maps only.
050 0208 Sounding datum
This code identifies a line shown by symbols
141.40(B) and 541.59(C), which represents the
starting elevation (0) for bathymetric contours
and is the mean lower low-water line. This
symbol is found on topographic-bathymetric maps
only.
050 0209 Low-water line
In areas where the shoreline is undetermined or
varies because of meteorological or other
conditions, double-line streams are shown with
the following symbols (starting onshore): a
dashed (indefinite) shoreline, "area subject to
inundation" fill, a line of small dashes (the
marsh outline symbol) indicating mean low water
or mean lower low water, and then the blue fill.
This code identifies a line shown by symbols
541.47(C) and 546.1(C), which represents the mean
low-water or mean lower low-water line.
050 0299 Processing line
Some routines in the processing software (PROSYS)
have limitations on the number of lines, nodes,
or areas that can be processed. For example, an
area may be associated with no more than 4,751
lines. This code describes a line or lines
digitized to segment the data within a file to
create more background areas, thereby enabling
large files to be processed.
3.5.5 Single-Point Attribute Codes
050 0300 Spring
This code identifies a point placed in the center
of the circular portion of a feature shown by
symbols 427(A), 141.25(B), 541.40(C), or
2205.03(D) and labeled. When the center of the
circular portion of the spring symbol does not
fall directly on a linear feature in this
overlay, it is digitized as a degenerate line.
However, when the center of the circular portion
of the spring symbol occurs directly on a linear
feature, such as a stream, it is digitized as a
node. In this case the tail of the spring is
ignored and the node is connected to the stream
element by digitizing a line following the
general alignment of the stream on the source,
and this line is coded consistent with the
stream. In the case where the spring is the
origin of a single-line stream, apply the code
for spring to the node along with 050 0001.
050 0301 Nonflowing well
This code identifies a point placed on a feature
shown by symbols 426(A), 141.26(B), 541.39(C), or
2205.02(D) and labeled. In areas where wells are
numerous, they may not all be labeled but are
still digitized. This code may also be used on
a node when the well symbol occurs directly on a
line that is being digitized in the hydrographic
overlay. A well is assumed to be nonflowing when
labeled only as "Well."
050 0302 Flowing well
This code identifies a point placed on a feature
shown by symbols 426(A), 141.26(B), 541.39(C), or
2205.02(D) and labeled "Flowing well". This code
may also be used on a node when the well symbol
occurs directly on a line that is being digitized
in the hydrographic overlay.
050 0303 Riser
This code identifies a point placed on a feature
that is shown by the located object symbol 198(A)
or 2111.03(D) and labeled "riser." A riser is a
vertical overflow pipe controlling the water
level in a reservoir.
050 0304 Geyser or vent
This code identifies a point placed on a special
type of spring that ejects hot water or steam
periodically. This includes gas vents, mud pots,
fumaroles, and steam vents. It is shown by
symbols 427(A), 141.26(B), 541.39(C), or
2205.03(D) and labeled.
050 0305 Windmill
This code identifies a point placed on a well
shown by symbols 199(A), 112.3(B), 512.69(C), or
2111.04(D). If the label indicates the well is
dry or salt, use codes 050 0614 or 050 0608 in
addition.
050 0306 Cistern
This code identifies a point placed on a feature
shown by symbols 426(A), 141.26(B), 541.39(C), or
2205.02(D) and labeled "cistern." This code may
also be used on a node when the symbol occurs
directly on a line that is being digitized in the
hydrography overlay.
3.5.6 General Purpose Attribute Codes
050 0400 Rapids
This code identifies rapids that are digitized as
a node, area, or line, depending on the symbol
treatment on the source. When rapids are shown
by double ticks across a single-line stream as in
symbols 443(A), 141.32(B), 541.54(C), or
2205.17(D), digitize a node between and
equidistant from the points where the ticks
intersect the stream. When shown by several
ticks across a single-line stream, digitize a
node at the beginning and ending points where the
ticks intersect the stream and apply this code to
the section of line between the nodes. If the
rapids are shown by double ticks across a narrow
double-line stream, as in symbols 141.32(B), or
541.54(C), digitize a line from bank to bank that
is between and equidistant from the two ticks.
In the case where the rapids are shown by a
pattern of ticks as in symbols 442(A), 141.31(B),
541.53(C), or 2205.16(D), then digitize an area
point in the rapids and identify it with this
code. The limit is digitized with a closure line
(050 0202) from bank to bank along the upstream
and downstream edges of the ticks. The rapids
area is implicitly part of the stream and does
not need to be coded as "stream."
050 0401 Falls
This code identifies a node placed where the tick
mark in symbols 441(A), 141.30(B), 541.52(C), or
2205.15(D) intersects a single-line stream to
show a small falls. It also identifies a
digitized line that follows the upstream edge of
symbols 440(A), 141.29(B), 541.51(C), or
2205.14(D) to depict a large falls on a
double-line stream. In the case of a tick mark
across a narrow double-line stream as is shown in
symbols 141.30(B) or 541.52(C), digitize a line
along the tick and identify it with this code.
050 0402 Gravel pit or quarry filled with water
This code identifies a body of water that has
formed naturally in a manmade excavation. It is
labeled as gravel pit or quarry. If the feature
is 0.030 inches or less in diameter, it is
digitized as a degenerate line. If it is greater
than 0.030 inch in diameter, it is digitized as an
area.
050 0403 Gaging station
This code identifies a point placed on symbols
200(A), 112.45(B), 512.113(C), or 2111.05(D). If
the center of the gaging station symbol occurs
directly on a line, such as a single-line stream
or bank of a double-line stream, it is digitized
as a node on that line. If the center of the
symbol is placed off the line, digitize as a
degenerate line.
050 0404 Pumping station
This code identifies a point placed on symbols
201(A), 163(A), 112.7(B), or 2111.06(D) and
labeled. If the feature is shown with the minimum
size building symbol, 163(A), and occurs directly
on a digitized line, it is coded as a node. If it
is separate from the line and shown with the
minimum size building symbol, 163(A), it is
digitized as a degenerate line. If the feature is
shown to scale, 165(A), it is digitized as an
area.
050 0405 Water intake
This code identifies a point placed on a labeled
water intake shown by symbols 198(A) or
2111.03(D). If the symbol is on a digitized line,
it is digitized as a node. If the symbol is
separate from the line, it is digitized as a
degenerate line. This code does not apply to
1:100,000- scale maps.
050 0406 Dam or weir
This code identifies a feature shown by symbols
152, 153, 313 (A); 112.63, 132.14 (B); 512.34,
512.35, 532.9 (C); or 2108.01, 2108.02, 2302.08
(D). The feature may be labeled or named. A weir
may be labeled "diversion weir". The code is used
as a line code when the dam is shown by a line.
When the dam is shown by contouring, digitize the
straight segment of the shoreline of the impounded
water, parallel to the contouring, and code as
dam. In general, a single-line dam is digitized
uniquely, and not double coded as shoreline. If
the dam is carrying a road as in symbols 155(A),
112.65(B), 511.20, 512.37 (C), or 2108.04(D),
digitize a centerline equidistant from the two
road casings and use code 059 0017 as well to
indicate the coincidence. The code is used as an
area code when the dam is a large structure
depicted to scale. The outer limits of the dam
generally are unattributed, except the edge
defining a shoreline, which is coded with the
appropriate shoreline code. The radiating lines
within symbol 153(A) are not digitized. See code
050 0407 for treatment of lock as in symbols
154(A), 112.64(B), 512.36(C), or 2108.03(D). If
the dam is of earthen construction also use code
050 0618.
050 0407 Canal lock or sluice gate
This code identifies canal locks or sluice gates
shown by symbols 160, 161, 154 (A); 112.66(B);
512.36, 512.38 (C); or 2108.08, 2108.09, 2108.03
(D). It is used as a node or line code depending
on the size of the feature. Symbols 160(A) or
2108.08(D) are digitized as nodes on the
single-line stream. Symbols 161(A) or 2108.09(D)
are digitized as lines across a double-line
stream. The lock
symbol within symbols 154(A) or 2108.03(D) is
digitized as a node on the dam line if shown at
symbol size (0.075 by 0.033 inch). If digitized
to scale and larger than the symbol, the outline
of the lock is digitized and coded. Some major
rivers have extensive structures shown to scale
for which the lock code is used on the enclosed
areas of the structures as well as any linear
extent. The enclosed water areas are not coded
as stream because that information is implied by
the feature.
050 0408 Spillway
This code identifies a spillway, which is shown
on a map in various ways. The spillway is
digitized as a node, area, line, or degenerate
line according to the size of the feature. If it
is shown by a small circle or dot, it is
digitized as a degenerate line. If the feature
is shown by drainage lines, perennial or
intermittent, it is digitized as a line. If the
spillway is indicated by an arrangement of
contour lines or a black box, it is digitized as
an area. If a spillway is represented as an
integral part of the dam, this code and an
elevation value (if applicable) are assigned to
a node on the digitized line of the dam. Some
judgment is required to correctly digitize the
spillway, as the feature is not always labeled.
The label "Spillway elevation NNNN" placed in the
impounded water area is sometimes the only
reference to the feature. If the feature itself
is represented by a label only, this code and the
elevation value are assigned to a node placed on
the digitized shoreline near the label.
050 0409 Gate (flood, tidal, head, or check)
This code identifies a variety of labeled
features used to control or divert the flow of
water. These features are shown by a tick or
black line. If shown by a tick on a
single-line stream, a node is digitized and
coded. If shown by a line on a double-line
stream, the line is digitized and coded.
050 0410 Rock
This code identifies a rock or group of rocks
shown by symbols 236, 237, 238, 246 (A); 112.97,
112.98, 112.99 (B); 512.136 through 512.138,
512.160 (C); or 2113.03, 2113.04 (D). A rock
shown by symbols 236, 237 (A); 112.97(B);
512.136, 512.137 (C); or 2113.03(D) is digitized
as a degenerate line. A group of rocks less than
0.030 inch diameter is also digitized as a
degenerate line. If the rocks are shown by
symbols 238(A), 112.98(B), 512.138(C), or
2113.04(D), the outline is digitized but not
coded; a point is placed in the area and coded.
A sunken rock shown by symbols 246(A), 112.99(B),
or 512.160(C) is digitized as a degenerate line
and is assigned this code as well as code 050
0612 (sunken).
050 0411 Crevasse (glacial)
This code identifies crevasse lines and crevasse
areas depicted by symbol 453(A). If the crevasse
area contains less than four lines, the
individual lines are digitized. Crevasse areas
that contain four or more lines are digitized as
an area. The edge of the crevasse pattern is
digitized as an apparent limit (see code 050
0204). This code does not apply to
1:100,000-scale maps.
050 0412 Stream
This code identifies all naturally flowing water
except braided streams (see code 050 0413).
Streams are shown by symbols 402, 403, 405, 406,
408 (A); 141.4, 141.5, 141.6 (B); 541.4, 541.5,
541.7, 541.8, 541.10, 541.11 (C); or 2202.01,
2202.02, 2202.05 (D). Single-line streams are
digitized as lines. Double-line streams are
digitized as areas. The limits of the
double-line stream area are formed by the left
and right banks (see codes 050 0605 and 050
0606), by a closure line (code 050 0202) to
separate the stream from a hydrographic area that
it enters, or by the neatline. The course of a
submerged stream in an impounded water area is
digitized as a separate area with the stream code
and the descriptive code for submerged (code 050
0612). The dashed blue lines are generally
digitized as unattributed lines. Use the
appropriate descriptive codes for streams that
are intermittent or unsurveyed. In some cases an
appropriately symbolized natural stream course
will carry a ditch label; however, do not code as
ditch.
050 0413 Braided stream
This code identifies braided streams that are
shown by symbols 404(A), 541.6, 541.9 (C), or
2202.03(D). A braided stream is a special case
where the stream subdivides into interlacing
channels. In map compilation, where possible,
the actual channels are shown. However, if the
channels are extremely complex or obscured by
vegetation, the outer limit is scribed accurately
and the inner channels are represented by a
conventional pattern. The use of pattern versus
actual channel is not noted on the map.
Therefore, the braided portion of a stream is
digitized as an area that carries this code. The
outer limits are digitized and carry left and
right bank codes (see codes 050 0605 and 050
0606). The braided area is separated from a
double-line stream by a closure line (code 050
0202) and from a single-line stream by nodes (see
codes 050 0004 and 050 0005).
050 0414 Ditch or canal
This code identifies any manmade, flowing water
feature used for irrigation, drainage, or
transportation shown by symbols 416 through 422
(A); 141.19, 141.20 (B); 541.31 through 541.33
(C); or 2204.01 through 2204.06 (D). These may be
labeled or unlabeled. Manmade water courses, of
various shapes, are included in this code, even if
not labeled. If an obviously natural stream
course carries a ditch label, do not use this
code. Some natural streams have portions that
appear to have been realigned by man. If the
artificial portion of a natural stream is not
identified by a label or name change, do not use
this code. The banks of double-line ditches and
the points of origin or where single-line canals
or ditches join water bodies are coded and
digitized in the same way as they are for streams
when the direction of flow can be determined.
Navigable canals used for transportation have an
additional code added to preserve this information
(code 050 0616). Use additional descriptive codes
to identify canals that are abandoned,
intermittent, and so on.
050 0415 Aqueduct
This code identifies features represented by
symbols 418, 419, 421, 423, 424, 425 (A); 141.19
through 141.23 (B); 541.31 through 541.36 (C); or
2204.03, 2204.04, 2204.06 through 2204.09 (D),
which are labeled "Aqueduct." Single-line
aqueducts are digitized as lines. Double-line
aqueducts are digitized as areas. The banks and
inter-sections of aqueducts with water bodies are
digitized and coded in the same manner as streams.
An aqueduct that goes into an underground water
tunnel is shown by symbols 424(A), 141.23(B),
541.35(C), or 2204.08(D) regardless of size.
Therefore, the portion of the aqueduct that is in
the tunnel is digitized as a line and carries the
code for tunnel
(050 0604) in addition to the aqueduct code.
This code combination is also used for a feature
shown by symbol 424 but labeled water tunnel. Use
additional descriptive codes to identify
aqueducts that are abandoned, elevated, or
underground.
050 0416 Flume
This code identifies features that are shown by
symbols 418, 419, 421, 423, 425 (A); 141.19
through 141.22 (B); 541.31 through 541.34, 541.36
(C); or 2204.03, 2204.04, 2204.06, 2204.07,
2204.09 (D) and labeled "Flume." A flume is an
artificial open inclined channel that conveys
water for a special purpose and is frequently an
elevated feature. A single-line flume is
digitized as a line. A double-line flume is
digitized as an area. The banks and the points
where flumes intersect water bodies are coded and
digitized in the same manner as streams. Use
additional descriptive codes to describe flumes
that are abandoned or elevated.
050 0417 Penstock
This code identifies a feature that is shown by
symbols 423, 425 (A); 141.21(B); 541.34, 541.36
(C); or 2204.07, 2204.09 (D) and labeled
"Penstock." A penstock is an underground or
exposed pipe conveying water from a canal or a
dam to a hydroelectric plant. It is usually
shown as a single-line feature, that is digitized
as a line. The penstock may be carried
underground in an aqueduct tunnel, symbols
424(A), 141.23(B), or 2204.08(D), in which case
the single line is digitized and carries the
additional code for tunnel (050 0604). In the
event that a penstock is shown as a double-line
feature in itself, it is digitized as an area.
The banks and intersections with water bodies are
coded and digitized in the same manner as
streams.
050 0418 Siphon
This code identifies features shown by symbols
452(A), 141.21(B), 541.41(C), or 2205.18(D). A
siphon is a pipe conveying water to another
level, either over or under an obstruction. On
1:24,000-scale maps, the dashes in the symbol may
be omitted on siphons less than 200 feet long and
a wing tick or break in the underpassing symbol
used instead. On 1:100,000-scale maps a siphon
is labeled. A single-line siphon is digitized as
a line. A double-line siphon is digitized as an
area. The limits of the area are unattributed.
Use the code to indicate overpassing (050 0602)
or underpassing (050 0617) on the portion of the
siphon that crosses the obstruction. The code
for overpassing is used if the relationship of
the features is not clear on the source material.
050 0419 Channel in water area
This code identifies a feature shown by symbols
444(A); 112.94, 141.9, 141.34 (B); or 512.154
through 512.156, 541.15, 541.16 (C). A channel
in a water area shown with a double line is
digitized as an area feature. By definition,
this code denotes water area and therefore the
area is not double coded. Arbitrary closure
lines are normally required to complete the
definition of an open-ended channel. The limits
of the area are not otherwise coded. This code
does not apply to submerged river courses in
inundated areas. Use this code to identify an
airboat trail, canoe trail, or wilderness
waterway shown by one of the symbols listed
above. See code 050 0616 for the application of
the "navigable" descriptive code to channels.
050 0420 Wash or ephemeral drain
This code identifies features shown by symbols
317, 409 (A); 134.1, 141.6 (B); 534.3, 541.13
(C); or 2112.04, 2202.06 (D). A wash is encoded
as a hydrographic feature because it is an
integral part of a stream network, generally
found in arid areas and often associated with
intermittent drainage. This code applies to
symbols 409(A), 141.6(B), 541.13(C), or
2202.06(D) only when the feature is labeled as a
wash. Any single-line drainage that is found in
an areal wash, shown by symbol 541.14(C), is
coded as appropriate. A wash is an ephemeral
drainage feature because it is normally dry, but
can contain runoff from heavy storms or snowmelt
for a few hours. The edge of an areal wash
pattern is coded as apparent limit (050 0204),
unless the limits are defined by a hydrographic
feature such as a double-line intermittent
stream, then it is coded as right bank (050 0605)
or left bank (050 0606), and intermittent (050
0610). Perennial features labeled as wash carry
only the perennial stream code. Sand areas
adjacent to double-line perennial streams are not
coded as washes, but as sand in the Non-
Vegetative Features category.
050 0421 Lake or pond
This code identifies a natural body of water of
any size. Lakes or ponds are shown by symbols
410, 411, 412, 414 (A); 134.7, 141.12, 141.13,
141.14 (B); 541.23, 541.25, 541.26 (C); or
2203.03, 2203.04, 2203.05, 2203.06 (D). This
classification includes also impounded rivers
that are labeled "Lake." A lake or pond that is
0.030 inch or less in diameter is digitized as a
degenerate line. If the lake or pond is 0.030
inch or less in diameter and has a drain
attached, it is digitized as a node. Any lake or
pond larger than 0.030 inch is digitized as an
area feature. The limits of the lake or pond are
coded with the appropriate shoreline code.
050 0422 Coral reef
This code identifies a coral reef or rock reef
shown by symbols 233, 234 (A); 135.8, 112.100 (B);
512.135, 517.2, 517.3, 535.11 (C); or 2113.02(D).
A coral reef or rock reef is digitized as an area
if greater than 0.030 inch in diameter. An
unattributed line is digitized around the outside
of the reef pattern. If there is a brown tint
inside the reef pattern, the inference is that the
reef uncovers at low water and the area should also
be coded as "flat" (050 0115). If there is no
brown tint inside of the reef pattern, the
inference is that the reef is always submerged and
the area should be coded only (050 0422). If the
coral reef or rock reef is shown by a symbol of
0.030 inches or less, it is digitized as a
degenerate line.
050 0423 Sand in open water
The code identifies an area of sand in other than
tidal waters. It is shown by symbols 322(A),
134.3(B), 534.4(C), or 2112.03(D). The sand is
digitized as an area if greater than 0.030 inch in
diameter or as a degenerate line if 0.030 inch or
less. The edge of the sand pattern is digitized as
an apparent limit (050 0204) unless defined by a
hydrographic limiting feature.
050 0424 Spoil area, dredged area, or dump area
This code identifies a feature labeled "Spoil
area", "Dredged area" or "Dump area." When shown
by symbols 401(A) or 2203.02(D), it is digitized as
a line. If shown by symbols 112.95(B) or
512.157(C), with or without blue tint in the
enclosed area, it digitized as an area. When shown
by two parallel dashed black lines without blue
tint between
them, it is also digitized as an area with a
closure line on each end. Lines depicting the
limits of the area are unattributed. By
definition, spoil areas are located in water
areas and therefore are not double coded.
050 0425 Fish ladder
This code describes a feature shown by symbol
512.39(C) or shown as a labeled portion of a
stream. When symbol 512.39(C) is depicted, the
outline is coded 050 0201 (manmade shoreline) if
shown in black or 050 0200 (shoreline) if shown
in blue, and the area inside is coded with this
attribute. When a section of a double-line
stream is labeled, the upstream and downstream
area limits are digitized as a closure line (050
0202), the shoreline is coded right bank or left
bank (050 0605, 050 0606), and the area is
attributed with this code. If a portion of a
single-line stream is labeled, unattributed nodes
are placed at the upstream and downstream limits,
and the linear portion of this feature is
attributed with this code. A fish ladder, that
is symbolized as a labeled portion of a stream
feature, is not double coded with the stream
code.
050 0426 Holiday area
This code identifies an inadequate survey area
feature shown by symbols 112.93(B) or 512.153(C)
and labeled "holiday area." The limits of this
area are uncoded.
3.5.7 Descriptive Attribute Codes - apply to multiple types of
feature
050 0601 Underground
This code describes a feature that is labeled
"underground" other than a tunnel, such as an
underground aqueduct shown by symbols 423(A),
141.21(B), 541.34(C), or 2204.07(D). This code
is not used to describe a portion of a feature
that is placed underground to pass under another
feature. (See code 050 0617.)
050 0602 Overpassing
This code describes a feature or section of a
feature that passes over rather than intersects
another feature. The code is generally applied
to a linear hydrographic feature carried over
another feature in a manmade object, such as an
aqueduct over a stream. The code is applied only
to the overpassing portion of a longer elevated
feature or to a section of a feature between wing
ticks that is raised just to cross the
obstruction. In some instances, such as a
double-line stream passing over an aqueduct, the
relationship of the feature is shown more simply
by using code 050 0617 on the underpassing
feature rather than using the overpassing code,
because only one of the two conditions need be
coded.
050 0603 Elevated
This code describes a feature that is raised
above ground level and is either labeled
"elevated," or has wing ticks to indicate the
elevated portion, as in symbols 425(A),
141.22(B), or 2204.09(D). This code is not used
to describe any portion of a feature that is
raised at some point in order to pass over
another feature. (See code 050 0602.)
050 0604 Tunnel
This code describes any portion of a feature that
is carried through a tunnel as indicated by
symbols 424(A), 141.23(B), 541.35(C), or
2204.08(D) or by a label. The code applies only
to the portion of the feature that is in the
tunnel. The concept of a tunnel conveys the idea
of underground or underpassing. Therefore the
additional attributes 050 0601 or 050 0617 are
not used.
050 0605 Right bank
This code describes the limit of a double-line
feature, such as a stream, that would be on the
right side if one were facing downstream.
050 0606 Left bank
This code describes the limit of a double-line
feature, such as a stream, that would be on the
left side if one were facing downstream.
050 0607 Under construction
This code describes any feature that has a label
indicating that it was under construction at the
time the map was made, typically canals or dams.
050 0608 Salt
This code describes any feature, such as a marsh
or well, that is labeled "salt."
050 0609 Unsurveyed
This code describes stream features shown by
symbols 408(A); 141.5(B); 541.03, 541.10, 541.11
(C); or 2202.05(D); which indicates a stream is
unsurveyed, or any other feature that is labeled
"unsurveyed."
050 0610 Intermittent
This code describes any hydrographic feature,
such as stream, pond, or canal, that is depicted
by an intermittent symbol, such as 405, 412, 417,
420 (A); 141.6(B); 541.7, 541.32 (C); or 2202.02,
2203.05, 2204.02, 2204.05 (D). This code
overrides the default value of "perennial" that
is assumed in the basic codes.
050 0611 Abandoned or discontinued
This code describes any feature that is labeled
"abandoned" or "discontinued."
050 0612 Submerged or sunken
This code describes any hydrographic feature that
was overprinted by blue tint to indicate it is
submerged, such as a marsh or an old river course
in an impounded water area. This code is not
used to define water channels (050 0419). It is
also used to describe features labeled "sunken."
The outline of the submerged river course is
generally digitized as an unattributed line.
050 0614 Dry
This code describes any feature that is labeled
"Dry," such as a dry lake, shown by symbols
134.7(B) or 534.5(C), or dry well.
050 0615 Mineral or hot (sulphur, alkali, and so on)
This code describes any well, spring, or water
source that is labeled to indicate the water is
hot or contains minerals. The labels vary
according to the substance in the water.
050 0616 Navigable - transportation
This code describes any canal that is labeled as
navigable and is therefore a transportation
feature. It is also used for channels intended
for transportation, such as the Intracoastal
Waterway.
050 0617 Underpassing
This code describes a feature or a section of a
feature that passes underneath, rather than
intersects, another feature. This code is
generally applied to a linear feature, such as an
aqueduct under a canal. In some cases, such as
a single-line stream passing under a siphon, the
relationship is more simply shown by using code
050 0602 on the overpassing feature rather than
using the underpassing code, because only one of
the two conditions need be coded.
050 0618 Earthen construction
This code describes a dam that is earthen in
construction as is shown in symbols 313(A),
132.14(B), 532.9(C), or 2302.08(D). This feature
must consist of two or more contours that are
shown parallel to a straightened or near-
straightened portion of the shoreline (which may
or may not have a perennial drain attached) and
(or) be labeled as a dam. This code (050 0618)
and the code for dam (050 0406) are assigned to
the straightened portion of the shoreline that
parallels the contours. This code (050 0618) and
the code for dam (050 0406) are also assigned to
the portion of the shoreline of a lake or pond
that is shown by a brown line. Do not apply this
code to the shoreline of a lake or pond that is
too small to require an interpolated elevation
(050 0619) and that has an intermittent stream
attached, for example, a stock pond.
050 0619 Interpolated elevation
This code identifies a water surface elevation
that is not printed on the graphic source but has
been interpolated from adjacent hypsography.
Interpolated elevations are applied when required
to perennial and intermittent lakes, ponds,
reservoirs, and other impounded bodies of water
meeting a minimum size of 0.500 inch at map
scale.
The following descriptive attribute codes represent
decimal fractions of feet or meters. They must only be
used in conjunction with the elevation or river mile mark
parameter attribute codes and only when the original
elevations or river mile marks are expressed to decimal
fractions or when applying interpolated elevations in
extremely flat areas. The units will be the same as those
of the corresponding parameter code.
050 0621 .1
050 0622 .2
050 0623 .3
050 0624 .4
050 0625 .5
050 0626 .6
050 0627 .7
050 0628 .8
050 0629 .9
3.5.8 Parameter Attribute Codes
05N ---- Elevation of actual, interpolated, or predicted
water surface
This code is used for the value of the water
surface elevation shown on bodies of water. The
value may be shown as "normal pool elevation
XXX," "elevation XXXX," or simply as a value
printed in blue or black. This code is also used
for the value of the maximum potential water
surface elevation shown on the indefinite
shoreline defining the limits of an area subject
to controlled inundation. The digitizer enters a
value in place of the "N" in the major code as
follows:
1 = whole feet
2 = whole meters
6 = whole feet below datum
7 = whole meters below datum
The elevation value is then entered into the
minor code, flush right. If a value in feet
exceeds four digits, it is converted to meters.
To express elevations in decimal feet or meters,
use this parameter code in conjunction with
descriptive attribute codes 050 0621 through 050
0629.
055 ---- River mile mark
This code identifies a river mile mark as shown by
symbol 512.109(C). The point is placed on the
black cross next to the label "Mile NNN." If the
cross occurs in the area of a double-line stream
it is digitized as a degenerate line. If the
cross occurs directly on a line that is also being
digitized, the point is digitized as a node on
that line. When the river mile mark is expressed
to a decimal fraction, use this code 055 xxxx for
the nondecimal value and 050 0621 through 050 0629
for the decimal value. Enter the value in the
minor code flush right. If the source material
has the value shown at intervals, such as at every
fifth mark, the digitizer assigns the appropriate
value to each mark.
050 0000 Photorevised feature
This code is described in section 3.3.3.
058 0000 Best estimate of classification or position
This code is described in section 3.3.3.
059 00-- Coincident feature
This code is described in section 3.3.3.
This sheet represents pages 3-14, which is blank
(Current version containing all changes through 11/15/93)
3.6 VEGETATIVE SURFACE COVER--MAJOR CODE 070
Features that are collected under this code include woods
or brush-wood, scrub, orchards or plantations, scattered
trees, and vineyards. Additional vegetative features that
are associated with wetland or submerged areas, such as
marshes and swamps, rice fields, mangrove, and cranberry
bogs, are collected under hydrography, major code 050.
3.6.1 General Principles
Vegetative surface cover information is shown on the map
source as an area of pattern or tint. Each area is
digitized by following the edge of the open-window
separate. If the open-window separate is not available,
the line is digitized following the outline of the pattern
or tint as closely as possible. The digitized line
depicting the limits of the vegetative feature is
3.6 VEGETATIVE SURFACE COVER--MAJOR CODE 070
Features that are collected under this code include woods
or brush-wood, scrub, orchards or plantations, scattered
trees, and vineyards. Additional vegetative features that
are associated with wetland or submerged areas, such as
marshes and swamps, rice fields, mangrove, and cranberry
bogs, are collected under hydrography, major code 050.
3.6.1 General Principles
Vegetative surface cover information is shown on the map
source as an area of pattern or tint. Each area is
digitized by following the edge of the open-window
separate. If the open-window separate is not available,
the line is digitized following the outline of the pattern
or tint as closely as possible. The digitized line
are associated with wetland or submerged areas, such as
marshes and swamps, rice fields, mangrove, and cranberry
bogs, are collected under hydrography, major code 050.
3.6.1 General Principles
Vegetative surface cover information is shown on the map
source as an area of pattern or tint. Each area is
digitized by following the edge of the open-window
separate. If the open-window separate is not available,
the line is digitized following the outline of the pattern
or tint as closely as possible. The digitized line
depicting the limits of the vegetative feature is
depicting the limits of the vegetative feature is
unattributed. However, the line digitized between
features, to retain the separate identity of each, is
coded as a closure line (070 0200). See figure 3-2. Note
that in the vegetative surface cover category, there are
no photorevised features shown in purple. Photorevised
vegetation is shown in green and not distinguishable as
such.
3.6.1.1 Vegetative Surface Cover Attribute Codes
3.6.1.1 Vegetative Surface Cover Attribute Codes
The attribute codes authorized for use in digitizing the
vegetative surface cover category are listed in this
section. The instructions for the use of the attribute
codes are given in section 3.6.2 through 3.6.8.
o Node attribute codes
None
o Area attribute codes
000 0000 Outside area
070 0101 Woods or brushwood
070 0102 Scrub
070 0103 Orchard or plantation
070 0104 Vineyard
070 0105 Scattered trees
070 0106 Void area
o Line attribute codes
070 0200 Closure line
070 0299 Processing line
o Single-point attribute codes
None
o General purpose attribute codes
None
o Descriptive attribute codes
None
o Parameter attribute codes
078 0000 Best estimate of position or
classification
079 00-- Coincident feature
3.6.2 Node Attribute Codes
There are no attribute codes for nodes in this category.
3.6.3 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
070 0101 Woods or brushwood
Wooded areas contain tree cover or brush that is
potential tree cover. The growth is at least 6
feet tall, is dense enough to afford cover for
troops, and has a minimum density between 20 and
35 percent. Woods are shown by symbols 600,
604(A); 152.1, 152.2, 152.3, 152.5(B); 552.1,
552.2, 552.3, 552.5(C); or 2402.01(D).
Woods which overprint swamp, submerged swamp, or
open water areas will be delineated as separate
from any contiguous wooded areas and will be
coded as coincident with the hydrographic overlay
as shown in Figure 3.2.
070 0102 Scrub
Scrub areas are covered with low-growing or
stunted perennial vegetation such as cactus,
mesquite, or sagebrush. Scrub is common in arid
areas and usually is not mixed with woods. It is
shown by symbols 603(A); 154.1(B), 554.1(C), or
2402.05(D).
070 0103 Orchard or plantation
Orchard or plantation areas consist of evenly
spaced trees or tall bushes that bear fruit or
nuts. Plantings of trees that are called groves
are included in this type. These features are
shown by symbols 601(A), 155.1(B), 555.1(C), or
2402.03(D).
Area Parameter
Area Feature attribute attribute
code code
1 Woods 070 0101 None
2 Submerged woods,
submerged wooded swamp,
wooded swamp 070 0101 079 0005*
3, 4, 5 Not digitized in this
category
* This code does not apply to 1:100,000-scale maps.
Figure 3-2
Attribute and parameter coding for woods, submerged woods,
wooded swamp and submerged wooded swamp
070 0104 Vineyard
Vineyards are plantings of grapevines or other
kinds of cultivated climbing plants, such as
berry vines and hops, supported and arranged
evenly in rows. Vineyards are shown by symbols
602(A), 156.1(B), 556.1(C), or 2402.04(D).
070 0105 Scattered trees
Scattered trees are woods or brushwood that are
less than the minimum density required for woods
(code 070 0101). Scattered trees are shown by
symbol 553.1(C).
070 0106 Void area
This code identifies the area on the source
material where vegetative surface cover data do
not exist because of replacement by imagery.
This code is also used to identify the area
beyond the national boundary to distinguish it
from the background area. The closure line that
defines the void area beyond the national
boundary is coded as coincident with the
Boundaries category (079 0009).
3.6.4 Line Attribute Codes
070 0200 Closure line
This code describes a line digitized to define
the perimeter of void areas that are not
otherwise explicitly symbolized. This code also
describes a line segment digitized between
vegetative features to retain separate identity
of each. See figure 3-2.
070 0299 Processing line
Some routines in the processing system (PROSYS)
have limitations on the number of lines, nodes,
or areas that can be processed. For example, an
area may be associated with no more than 4,751
lines. This code identifies a line or lines
digitized to segment the data within a file to
create more background areas, thereby enabling
large files to be processed.
3.6.5 Single-Point Attribute Codes
There are no single-point attribute codes for this
category.
3.6.6 General Purpose Attribute Codes
There are no general purpose attribute codes for this
category.
3.6.7 Descriptive Attribute Codes
There are no descriptive attribute codes for this
category.
3.6.8 Parameter Attribute Codes
078 0000 Best estimate of position or classification
This code is described in section 3.3.3.
079 00-- Coincident feature
This code is described in section 3.3.3. For the
Vegetative Surface Cover category, the coincident
feature parameter code is used for wooded swamps,
submerged wooded swamps, or submerged woods.
Figure 3-2 depicts an example.
(Current version containing all changes through 11/15/93)
3.7 NON-VEGETATIVE FEATURES--MAJOR CODE 080
3.7.1 General Principles
The purpose in digitizing non-vegetative features is to
collect information about the natural surface of the Earth
as symbolized on the map. This includes lava, sand, and
gravel features. Numerous other non-vegetative features
are included in the categories of Hydrography (major code
050) and Manmade Features (major code 200). Vegetative
surface features are in the category of Vegetative Surface
Cover (major code 070).
The non-vegetative features information is primarily
digitized as distinct areas (polygons) identified by an
attribute code assigned to a point within the area. The
outline of the area is digitized from the open-window
separate used to prepare the map. If the separate is not
available, the line is digitized by following the outline
of the symbolized area as closely as possible. The
outline of the coded area is not given an attribute code,
unless it is coincident with a linear feature in another
category. Non-vegetative features symbolized as point
features, such as natural arches, are also digitized in
this category.
3.7.1.1 Non-Vegetative Features Attribute Codes
The attribute codes authorized for use in digitizing non-
vegetative features are listed in this section and the
instructions for the use of the codes are given in
sections 3.7.2 through 3.7.8.
o Node attribute codes
None
o Area attribute codes
000 0000 Outside area
080 0100 Glacial moraine
080 0101 Gravel beach
080 0102 Sand area or beach
080 0103 Shifting sand or dune area
080 0104 Lava
080 0105 Void area
o Line attribute codes
080 0200 Closure line
080 0299 Processing line
o Single-point attribute codes (degenerate line)
080 0300 Located surface feature
o General purpose attribute codes
None
o Descriptive attribute codes
None
o Parameter attribute codes
080 0000 Photorevised feature
088 0000 Best estimate of position or
classification
089 00-- Coincident feature
3.7.2 Node Attribute Codes
There are no attribute codes for nodes in this category.
3.7.3 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
080 0100 Glacial moraine
A glacial moraine is an area of gravel deposited
by a glacier. The glacier symbol (see code 050
0103) may be adjacent to the moraine. Areas
where the glacial moraine
pattern overlaps a glacier are coded coincident
with the hydrography category (080 0005). The
moraine is shown by symbols 320(A), 134.4(B), or
537.2(C). However, on 1:100,000-scale maps, the
symbol is not labeled. Therefore, the feature
must be examined with respect to the surrounding
area to identify a moraine correctly.
080 0101 Gravel beach
This code identifies an area shown by the gravel
pattern USGS 22 or by symbols 329(A), 134(B),
537.1(C), or 2112.03(D) and labeled "gravel."
Note that on 1:100,000-scale maps, the sand and
gravel beaches are shown by the sand pattern USGS
17 and the only distinction made between them is
the label "gravel."
080 0102 Sand area or beach
This code identifies an area shown by the sand
pattern, USGS 17 or by symbols 316(A), 134.3(B),
or 534.1(C). A sand beach is not labeled on
1:24,000-scale maps, nor is there a separate
symbol number, but is usually found bordering a
large water body. On 1:100,000-scale maps, this
code is used for all beaches as shown in symbol
134.5(B). On P-Maps this code is used for all
areas and beaches as shown by symbol 2112.03(D)
and labeled "sand."
080 0103 Shifting sand or dune area
This code identifies an area shown by symbols
331(A), 134.6(B), 534.2(C), or 2112.03(D). Each
symbol carries the label "sand dunes." On older
maps shifting sand may be shown by USGS 17A,
which is no longer in use. Such areas are also
identified by this code.
080 0104 Lava
This code identifies an area shown by symbols
328(A), 135.5(B), 535.6(C), or 2112.07(D) or
outlined by symbol 532.24(C), all labeled "Lava."
Such areas must be labeled to have this code
assigned because the disturbed surface symbols
are used for other features.
080 0105 Void area
This code identifies an area on the source
material, beyond the national boundary, where
non-vegetative feature data do not exist because
of replacement by imagery. This code is also
used to identify the area beyond the national
boundary to distinguish it from the background
area. The closure line that defines the void
area beyond the national boundary is coded as
coincident with the Boundaries category (089
0009).
3.7.4 Line Attribute Codes
080 0200 Closure line
This code describes a line digitized to define
the perimeter of void areas that is not otherwise
explicitly symbolized.
080 0299 Processing line
Some routines in the processing system software
(PROSYS) have limitations on the number of lines,
nodes, or areas that can be processed. For
example, an area may be associated with no more
than 4,751 lines. This code describes a line or
lines digitized to segment the data within a file
to create more background areas, thereby enabling
large files to be processed.
3.7.5 Single-Point Attribute Codes
080 0300 Located surface feature
This code describes a point placed on a landmark
surface feature that is shown by symbols 198(A),
112.4(B), 412.72(C), or 2111.03(D) and labeled.
Landmark surface features may include natural
arches and natural bridges, which are not
otherwise symbolized.
3.7.6 General Purpose Attribute Codes
There are no general purpose attribute codes in this
category.
3.7.7 Descriptive Attribute Codes
There are no descriptive attribute codes in this category.
3.7.8 Parameter Attribute Codes
080 0000 Photorevised feature
This code is defined in section 3.3.3.
088 0000 Best estimate of position or classification
This code is defined in section 3.3.3.
089 00-- Coincident feature
This code is defined in section 3.3.3.
(Current version containing all changes through 11/15/93)
3.8 BOUNDARIES--MAJOR CODE 090
3.8.1 General Principles
The purpose of digitizing boundaries is to convert into
digital form the point and line information, displayed on
a map source, that is part of the National Mapping
Division base category denominated as boundaries. Map
information normally considered to be in other base
categories, but using symbology similar to that found in
the boundaries category, e.g., cemetery, ruins, and
drive-in theatre limits, is not included in the boundaries
category.
Counties, or county equivalents, may be divided into minor
civil subdivisions. Quadrangle maps show only
subdivisions that are reasonably stable. Incorporated
places includes cities, towns, and villages, which may be
subdivisions of the county, town, or township wherein they
are located or may be coextensive with them or
independent.
Hawaii is divided into five counties. Four of the
counties are subdivided into districts. Districts are
subdivided into smaller areas called ahupuaas, and
ahupuaas are subdivided into small land divisions called
ilis and leles. The boundaries of ilis and leles are not
collected. A further land subdivision shown on 1:24,000-
Scale maps in Hawaii is the homestead. The homesteads are
much smaller than the ahupuaas, generally less than a
square mile.
Line attribute codes are not attached to a boundary if
they are implicitly defined by its bounding areas. For
example, a civil township boundary is deducible as such
from the area codes on either side of it. However,
boundary lines that are coincident with features from
other categories or that have been revised have the
appropriate parameter or descriptive codes attached to the
line segment itself, i.e., 099 00 or 090 0000.
Boundaries are described in Topographic Instructions,
Chapter 4a3, Boundaries on 1:24,000-Scale Maps (January
1980).
3.8.1.1 Boundaries Attribute Codes
The attribute codes used in digitizing boundary
information are listed in this section. Instructions for
the use of the attribute codes are given in sections 3.8.2
through 3.8.6.
o Node attribute codes
090 0001 Monumented point on a boundary
o Area attribute codes
000 0000 Outside area
090 0100 Civil township, district, precinct, or
barrio
090 0101 Incorporated city, village, town,
borough, or hamlet
090 0103 National park, monument, lakeshore,
seashore,
parkway, battlefield, or recreation area
090 0104 National forest or grassland
090 0105 National wildlife refuge, wildlife
management area,
game preserve, or fish hatchery
090 0106 National scenic waterway, riverway, wild
and scenic river, or wilderness area
090 0107 Indian reservation
090 0108 Military reservation
090 0110 Federal prison
090 0111 Miscellaneous Federal reservation
090 0129 Miscellaneous State reservation
090 0130 State park, recreation area, arboretum,
or lake
090 0131 State wildlife refuge, wildlife
management area,
game preserve, or fish hatchery
090 0132 State forest or grassland
090 0133 State prison
090 0134 County game preserve
090 0135 Ahupuaa (Hawaii)
090 0136 Hawaiian homestead
090 0150 Large park (city, county, or private)
090 0151 Small park (city, county, or private)
090 0197 Canada
090 0198 Mexico
090 0199 Open water
o Line attribute codes
090 0201 Indefinite (or approximate) boundary
090 0202 Disputed boundary
090 0203 Historical line
090 0204 Boundary closure line
090 0299 Processing line
o Single-point attribute codes (degenerate line)
090 0301 Reference monuments for boundary points
o Parameter attribute codes
090 0000 Photorevised feature
091 00-- State or State equivalent FIPS code
092 0--- County or county equivalent FIPS code
093 00-- Civil township or civil township
equivalent FIPS code, first two digits
094 0--- Civil township or civil township
equivalent FIPS code, last three digits
095 ---- Monument number
096 XXYY Alphabetic portion of any monument number
Substitute numeric equivalent of
alphabetic portion for XX and for YY as follows:
00 = blank, 01 = A, 02 = B, 03 = C, 04 = D,
05 = E, 06 = F, 07 = G, 08 = H, 09 = I, 10 = J,
11 = K, 12 = L, 13 = M, 14 = N, 15 = O, 16 = P,
17 = Q, 18 = R, 19 = S, 20 = T, 21 = U, 22 = V,
23 = W, 24 = X, 25 = Y, 26 = Z.
098 0000 Best estimate of classification or position
099 00-- Coincident feature
3.8.2 Node Attribute Codes
090 0001 Monumented point on a boundary
This code describes a physical monument lying on
a boundary line. This includes any of the
following:
o recovered section corners, quarter corners, closing
corners, angle points, or meander turning points
that fall on a boundary. These monuments are
designated by symbols 506, 507, 510, 511, 523 (A);
523.5 through 523.7 (C); or 2502.07, 2502.08 (D).
The coincidence code 099 0030 is also used.
o survey control stations on a boundary. These
monuments are designated by symbols 216 through
219, 222, 223, 225 through 227, 230, 231 (A);
512.99 through 512.107 (C); or 2102.02 through
2102.04, 2102.06 through 2102.09, 2102.12 (D). The
coincidence code 099 0015 is used in all cases, and
coincidence code 099 0030 is also used if the
monument is coincident with the U.S. Public Land
Survey System.
o land grant monuments on a boundary. These
monuments are designated by symbols 501(A) or
2502.02(D). The coincidence code 099 0030 is used.
Land grants are digitized as part of Public Lands.
o any other point represented with a red or black
boundary monument symbol. If the monument is
numbered, also use code 095 ----.
3.8.3 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
090 0100 Civil township, district, precinct, or barrio
This code identifies a point placed within an
area delineated by symbols 205(A), 112.77(B),
512.126(C), or 2107.03(D).
090 0101 Incorporated city, village, town, borough, or
hamlet
This code identifies a point placed within an
area delineated by symbols 206(A), 112.77(B),
512.127(C), or 2107.04(D).
090 0103 National park, monument, lakeshore, seashore,
parkway, battlefield, or recreation area
This code identifies a point placed within a
national park, national monument, national
recreation area, national seashore or lakeshore,
national historic site, national parkway, or
national battlefield. The following national
areas are normally administered by the National
Park Service and can be included under the
national park attribute code: historic parks and
places, memorial parks, natural landmarks, and
national preserves. National cemeteries are
included under the national park code and are
given the coincidence code 099 0020. All areas
with pink stippling along the boundary should be
included under national parks unless the area
label falls within one of the other Federal area
categories. National park areas are delineated
by symbols 207(A), 112.78(B), 512.128(C), or
2107.05(D).
090 0104 National forest or grassland
This code identifies a point placed within a
national forest or grassland delineated by
symbols 207(A), 112.78(B), 512.128(C), or
2107.05(D).
090 0105 National wildlife refuge, wildlife management
area, game preserve, or fish hatchery
This code identifies a point placed within a
wildlife recreation or management area, fish
hatchery, animal range, or refuge for specific
animals, and is delineated by symbols 207(A),
112.78(B), 512.128(C), or 2107.05(D).
090 0106 National scenic waterway, riverway, wild and
scenic river, or wilderness area
This code identifies a point placed within a
national scenic waterway, riverway, wild and
scenic river, or wilderness area. These areas
are delineated by symbols 207(A), 112.78(B),
512.128(C), or 2107.05(D).
090 0107 Indian reservation
This code identifies a point placed within an
Indian reservation, including those that have
boundaries symbolized with a solid red line. If
the solid red line is labeled with the name "Old
Indian Reservation Boundary" it should be
assigned only the historical line code (see code
090 0203). Rancherias and Indian allotments are
types of Indian reservations, all of which are
delineated by symbols 207(A), 112.78(B),
512.128(C), or 2107.05(D).
090 0108 Military reservation
This code identifies a point placed within a
military reservation. Examples are: forts,
bases, weapons stations, Coast Guard stations,
and bombing and gunnery ranges. These areas are
delineated by symbols 207(A), 112.78(B),
512.128(C), or 2107.05(D).
090 0110 Federal prison
This code identifies a point placed within a
Federal prison delineated by symbols 207(A),
112.78(B), 512.128(C), or 2107.05(D).
090 0111 Miscellaneous Federal reservation
This code identifies a point placed within a
Federal government reservation not included in
any other Federal area category. An example is
a veterans hospital. This code and code 090 0129
replace previous code 090 0109, Non-military
Government Reservation. The area is delineated
by symbols 207(A), 112.78(B), 512.128(C), or
2107.05(D).
090 0129 Miscellaneous State reservation
This code identifies a point placed within a
State equivalent government reservation not
included in any other State area category. An
example is State hospital. This code and code
090 0111 replace previous code 090 0109, Non-
military Government Reservation. The area is
delineated by symbols 207(A), 112.78(B),
512.128(C), or 2107.05(D).
090 0130 State park, recreation area, arboretum, or lake
This code identifies a point placed within a
State park, recreation area, arboretum, or lake
delineated by symbols 207(A), 112.78(B),
512.128(C), or 2107.05(D).
090 0131 State wildlife refuge, wildlife management area,
game preserve, or fish hatchery
This code identifies a point placed within a
State wildlife refuge, wildlife management area,
fish hatchery, or game preserve delineated by
symbols 207(A), 112.78(B), 512.128(C), or
2107.05(D).
090 0132 State forest or grassland
This code identifies a point placed within a
State forest or grassland delineated by symbols
207(A), 112.78(B), 512.128(C), or 2107.05(D).
090 0133 State prison
This code identifies a point placed within a
State prison area delineated by symbols 207(A),
112.78(B), 512.128(C), or 2107.05(D).
090 0134 County game preserve
This code identifies a point placed within a
county game preserve delineated by symbols 207,
209 (A); 512.128, 512.129 (C); or 2107.05,
2107.06 (D).
090 0135 Ahupuaa (Hawaii)
This code identifies a point placed within an
area delineated by symbols 500(A), 112.78(B),
523.10(C), or 2502.01(D). Code 300 0103 is not
used for ahupuaas because they are not part of
the Public Land Survey System. More explanation
of this code is given in section 3.8.1.
090 0136 Hawaiian homestead
This code identifies a point placed within an
area delineated by symbols 500(A), 112.78(A),
523.10(C), or 2502.01(D). Codes 090 0111 and 090
0129 are not used for Hawaiian homesteads because
they are not reservations. More explanation of
this code is given in section 3.8.1.
090 0150 Large park (city, county, or private)
This code identifies a point placed within a
regional, city, county, or private park
delineated by symbols 207(A), 112.79(B),
512.128(C), or 2107.05(D).
090 0151 Small park (city, county, or private)
This code identifies a point placed within a
regional, city, county, or private park
delineated by symbols 209(A), 512.129(C), or
2107.06(D).
090 0197 Canada
This code identifies a point placed within the
boundaries of Canada. The boundary between
Canada and the United States is identified by
symbols 202(A), 112.74(B), 512.123(C), or
2107.01(D).
090 0198 Mexico
This code identifies a point placed within the
boundaries of Mexico. The boundary between
Mexico and the United States is identified by
symbols 202(A), 112.74(B), 512.123(C), or
2107.01(D).
090 0199 Open water
This code identifies a point placed within water
areas on coastal quadrangles, which are not
otherwise included within a coded area, such as
091 00xx-- State FIPS.
3.8.4 Line Attribute Codes
090 0201 Indefinite (or approximate) boundary
This code identifies a boundary for which the
accuracy of location does not meet National Map
Accuracy Standards for well-defined features.
Indefinite boundaries of county rank or higher
appear on 1:100,000- and 1:24,000-scale maps with
standard symbolization but reduced to one-half
the specified lineweight and labeled "Indefinite
Boundary." Those of less than county rank are
shown with normal symbolization and lineweight
and are labeled "Indefinite Boundary."
Boundaries labeled "Approximate" on
1:24,000-scale maps are included under this code.
Indefinite boundaries are depicted by symbols
212(A), 112.80(B), or 512.130(C).
090 0202 Disputed boundary
This code identifies a State, county, or national
reservation boundary that is unmarked and cannot
be located on the ground from other substantial
evidence, that has a disputed location, or that
the recorded description of cannot be reconciled
with local conditions. Disputed boundaries are
labeled "Indefinite" on the map with an
additional marginal note.
090 0203 Historical line
This code identifies boundary lines that have
some historical significance as indicated by a
label. These include boundaries labeled with a
name, old Indian treaty or allotment lines,
historical State lines, and old military
reservation boundaries (shown in red).
090 0204 Boundary closure line
This code identifies lines digitized to complete
unclosed boundaries. In the case of national,
State, or county boundaries that stop at a
shoreline, the shoreline is
digitized and given this attribute. The offshore
area is then given the appropriate area code. In
the case where a national, State, or county
boundary is extended out from shore and dropped,
an arbitrary line is digitized by extending the
line from the drop point to the quadrangle
neatline and giving the new line the 090 0204
attribute code. The water area within the
boundary is given the same code as the equivalent
land area.
090 0299 Processing line
Some routines in the processing system (PROSYS)
have limitations on the number of lines, nodes,
or areas that can be processed. For example, an
area may be associated with no more than 4,751
lines. This code describes a line or lines
digitized to segment the data within a file to
create more background areas, thereby enabling
large files to be processed.
3.8.5 Single-Point Attribute Codes (degenerate lines)
090 0301 Reference monuments for boundary points
This code identifies monumented points not on a
boundary line, but serving as references to
establish the location of points on the boundary.
Reference monuments are delineated by symbols
226(A) or 512.105(C). If the monument is
numbered, also use code 095 ----.
3.8.6 Parameter Attribute Codes
090 0000 Photorevised feature
This code is described in section 3.3.3.
091 00-- State or State equivalent FIPS code
Enter the two-digit State or State equivalent
FIPS code.
092 0--- County or county equivalent FIPS code
Enter the three-digit county or county equivalent
(e.g., parish, independent city) FIPS code.
093 00-- Civil township or township equivalent FIPS code
Enter the first two of the five-digit township or
township equivalent FIPS code.
094 0--- Civil township or township equivalent FIPS code
Enter the last three of the five-digit township
or township equivalent FIPS code.
095 ---- Monument number
Enter the one- to four-digit monument number,
flush right.
096 XXYY Alphabetic portion of any monument number
This code is used to encode the alphabetic
portion of any monument number. The code is used
in conjunction with the appropriate code 095 ----
if the monument designation is
mixed numeric and alphabetic. The code can hold
one or two letters by substituting the numeric
equivalent 01 to 26 for the letters A to Z with
00 substituting for a blank. If one letter is
encoded it will be entered in the YY portion of
the code with blank coded into the XX portion.
The code precedes or follows the numeric portion
of the monument number in accordance with its
actual position. In the case of an entirely
alphabetic monument designator, also use the FIPS
code to specify jurisdiction with 0000 entered
into the minor code. The procedure for encoding
the alphabetic portion of a monument number is
identical to the procedure for encoding the
alphabetic portion of a route number as described
under code 177 XXYY.
098 0000 Best estimate of classification or position
This code is described in section 3.3.3.
099 00-- Coincident feature
This code is described in section 3.3.3.
(Current version containing all changes through 11/15/93)
3.9 SURVEY CONTROL AND MARKERS--MAJOR CODE 150
3.9.1 General Principles
The purpose of collecting Survey Control and Markers
category data is to capture horizontal and vertical
control information about the points of established
horizontal and vertical positions that are used as fixed
references in positioning and correlating map features.
The vertical control data are digitized from the graphic
source, and the survey control markers with horizontal
control data are derived from ancillary source (i.e.,
geodetic control sheets). Not included are elevation data
of less than third order, such as spot elevations, or the
"T" and "AT" spot elevations on provisional maps.
The features in this category are generally digitized as
single-point features, also called degenerate lines. When
these features are located directly on a linear feature in
this overlay, they are collected as node elements. Each
single-point feature is assigned a code to describe the
type of control point or marker and appropriate parameter
codes to designate the location and elevation. Each
single- point feature is also assigned the State and
county FIPS codes.
Several of the control points and markers are coincident
with points in the U.S. Public Land Survey System or in
the Boundaries category. Such features are also assigned
the coincident feature code. The list of codes used is in
section 3.9.1.1 and instructions for their use are in
sections 3.9.2 through 3.9.8.
The codes that describe a photorevised feature and a best
estimate of position/classification are not used in this
category.
Only one of the codes in this section is applicable to
1:100,000-scale maps, code 150 0331.
3.9.1.1 Survey Control and Markers Attribute Codes
The attribute codes used in digitizing survey control
features are listed in this section. Instructions for the
use of the attribute codes are given in sections 3.9.2
through 3.9.8.
o Node attribute codes
None (See 3.9.1)
o Area attribute codes
000 0000 Outside area
150 0100 Void area
o Line attribute codes
150 0200 Closure line
o Single-point attribute codes
150 0300 Horizontal control station, third order
or better, permanent mark
150 0301 Horizontal and vertical control station,
third order or better
150 0302 Horizontal control station, vertical
angle bench mark (VABM)
150 0303 Horizontal control station, checked spot
elevation
150 0310 Vertical control station, third order or
better, tablet
150 0311 Vertical control station, recoverable
mark, third order or better, no tablet
150 0320 Boundary monument, third order or better,
tablet
150 0321 Boundary monument, third order or better,
no tablet
150 0330 Reference monument
150 0331 U.S. mineral or location monument
150 0332 Other control point
o General purpose attribute codes
None
o Descriptive attribute codes
150 0601 - 150 0609 Fractions of elevation values
o Parameter attribute codes
151 ---- State or State equivalent FIPS code
152 ---- County or county equivalent FIPS code
153 ---- Elevation in feet
154 ---- Elevation in meters
155 ---- Elevation in feet below datum
156 ---- Elevation minus 10,000 for elevations
greater than 9,999 feet
157 ---- Elevation in meters below datum
159 00-- Coincident feature
3.9.2 Node Attribute Codes
There are generally no node attribute codes in this
category. However, single-point features, which are
generally digitized as degenerate line elements, are
digitized as node elements when located on a line (200 -
closure line) in this category. See sections 3.9.3,
3.9.4, and 3.9.5 for additional information.
3.9.3 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
150 0100 Void area
This code identifies an area on the source
material where no survey control data exist
because of replacement by imagery or a pattern
from another category. A void area is also found
beyond the national boundary to distinguish it
from the background area. Where appropriate, the
perimeter of the void area, a closure line, is
coded as coincident with the category that
defines the survey control void area. The
closure line that defines the void area beyond
the national boundary is coded as coincident with
the Boundaries category (159 0009).
3.9.4 Line Attribute Codes
150 0200 Closure line
This code describes a line digitized to define
the perimeter of void areas.
3.9.5 Single-Point Attribute Codes
Although the following single-point features are generally
digitized as degenerate line elements, they are digitized
as node elements when located on a line (200 - closure)
collected in this category.
150 0300 Horizontal control station, third order or
better, permanent mark
This code identifies a degenerate line placed on
a horizontal control station of third order or
better with a permanent mark. It is shown by
symbols 216(A), 512.99(C), or 2102.03(D). If the
control station is coincident with a section
corner as shown by symbols 229(A) or 512.101(C)
also use code 159 0030.
150 0301 Horizontal and vertical control station, third
order or better
This code identifies a degenerate line placed on
a horizontal control station having elevation
data of third order or better and labeled BM
(benchmark) as shown by symbols 217(A),
512.199(C), or 2102.03(D). If the control
station is coincident with a section corner as
shown by symbols 229(A) or 512.101(C) also use
code 159 0030. See codes 153---- through 156----
for the appropriate elevation code.
150 0302 Horizontal control station, vertical angle bench
mark (VABM)
This code identifies a degenerate line placed on
a horizontal control station, third order or
better, with vertical angle elevation indicated
by the label VABM as shown by symbols 218(A) or
2102.03(D). See codes 153---- through 156----
for the appropriate elevation code.
150 0303 Horizontal control station, checked spot
elevation
This code identifies a degenerate line placed on
a horizontal control station, third order or
better, with a checked spot elevation as shown by
symbols 219(A), 512.99(C), or 2102.04(D). Do not
code the elevation value in this category because
it is coded in the hypsography category.
150 0310 Vertical control station, third order or better,
tablet
This code identifies a degenerate line that is
placed on a vertical control station with
elevation data of third order or better and that
is marked with a tablet as is shown by symbols
220(A), 512.100(C), or 2102.06(D). If that
station is coincident with a found section corner
as shown by symbols 230(A) or 512.102(C), also
use code 159 0030. See codes 153--- through 156-
-- for the appropriate elevation code.
150 0311 Vertical control station, recoverable mark, third
order or better, no tablet
This code identifies a degenerate line placed on
a vertical control station without a tablet but
with a recoverable mark as shown by symbols
221(A), 512.100(C), or 2102.07(D). See codes
153---- through 156---- for the appropriate
elevation code.
150 0320 Boundary monument, third order or better, tablet
This code identifies a degenerate line placed on
a boundary monument with elevation data of third
order or better that has a tablet as shown by
symbols 222, 501 (A) or 512.104, 523.22 (C). If
the monument is shown by symbols 222(A) or
512.104(C) also use code 159 0009; if shown
in red by symbols 501(A) or 523.11(C) also
use code 159 0030. Although both of
these symbols are digitized in another
category, they must
be digitized in this category as well to collect
the elevation data. A monument number, if shown,
is encoded in the Boundaries category. See codes
153 ---- through 156 ---- for the appropriate
elevation code.
150 0321 Boundary monument, third order or better, no
tablet
This code identifies a degenerate line placed on
a boundary monument with elevation data of third
order or better but without a tablet as shown by
symbols 223, 501 (A) or 512.104, 523.11 (C). If
the monument is shown by symbols 223(A) or
512.104(C), also use code 159 0009; if shown in
red by symbols 501(A) or 523.11(C), also use code
159 0030. A monument number, if shown, is
encoded in the Boundaries category. See codes
153 ---- through 156 ---- for the appropriate
elevation code.
150 0330 Reference monument
This code identifies a degenerate line placed on
a reference monument shown by symbols 226(A) or
512.105(C).
150 0331 U.S. mineral or location monument
This code identifies a degenerate line placed on
a U.S. mineral or location monument as shown by
symbols 227(A), 512.106(C), or 2102.12(D). This
is the only code in this category that appears on
1:100,000-scale maps where it is shown by symbol
112.46(B).
150 0332 Other control point
This code identifies a degenerate line placed on
any other control point as shown by symbols
231(A) or 512.103(C).
3.9.6 General Purpose Attribute Codes
There are no general purpose attribute codes in this
category.
3.9.7 Descriptive Attribute Codes
There are nine attribute codes that are used to encode
fractions of elevation values in tenths.
150 0601 .1
150 0602 .2
150 0603 .3
150 0604 .4
150 0605 .5
150 0606 .6
150 0607 .7
150 0608 .8
150 0609 .9
3.9.8 Parameter Attribute Codes
151 00-- State or State equivalent FIPS code
Enter in the two spaces, flush right, the two
digit FIPS code for the state in which the
control point is located.
152 0--- County or county equivalent FIPS code
Enter in the three spaces, flush right, the
three-digit FIPS code for the county in which the
control point is located.
153 ---- Elevation in feet
Enter in the four spaces, flush right, the
elevation shown for the control point, shown in
feet on standard unit maps. If the elevation is
greater than 9,999 feet use code 156 ----.
154 ---- Elevation in meters
Enter in the four spaces, flush right, the
elevation shown for the control point, shown in
meters on metric unit maps. If a fractional part
of a meter is shown, use the appropriate
descriptive attribute to encode the value.
155 ---- Elevation in feet below datum
Enter in the four spaces, flush right, the
elevation shown for the control point. This code
is only used for negative elevations shown in
feet on standard unit maps.
156 ---- Elevation minus 10,000 for elevations greater
than 9,999 feet
If the elevation for a control point is greater
than 9,999 feet, subtract 10,000 from that
elevation and enter the remainder in the four
spaces, flush right. Do not use this code with
code 153 ---- to encode the total amount.
157 ---- Elevation in meters below datum
Enter in the four spaces, flush right, the
elevation shown for the control point. This code
is only used for negative elevations shown in
meters on metric unit maps.
Examples: elevation 8,745 feet - 153 8745
elevation 12,321 feet - 156 2321
elevation 423 meters - 154 0423
elevation 3,480.5 feet - 153 3480, 150
0605
elevation -5 feet - 155 0005
159 00-- Coincident feature
This code is defined in section 3.3.3.
(Current version containing all changes through 11/15/93)
3.10 TRANSPORTATION--MAJOR CODES 170, 180, 190
The National Mapping Division collects digital information
about transportation in three categories to support the
analysis and extraction of data to meet the needs of a
wide variety of users. The categories collected are:
major code 170 - Roads and Trails
major code 180 - Railroads
major code 190 - Pipelines, Transmission Lines, and
Miscellaneous Transportation Features
3.10.1 General Principles
These data are collected in three separate categories for
each map source, which means that the attribute codes from
the three categories are not intermingled, however the
three categories are distributed by the National
Cartographic Data Base Office as one unit. When
collection of transportation is authorized from a map
source, all of the transportation for that source is
collected. If there are no features in a particular
category on a source, the header record shows that the
file was initialized to hold Roads and Trails, Railroads,
or Pipelines, Transmission Lines, and Miscellaneous
Transportation Features, but the neatlines of the source,
the background area, and the area outside the map, are the
only information digitized for that category.
The only area records in any transportation category are
one or more background areas, existing void areas, and the
area outside the map.
The general purpose attribute codes that are used on
various element types are applicable only to nodes and
lines. The descriptive attribute codes are used as
modifiers to the node, line, degenerate line, or
general purpose attribute code that defines
the feature. The common attribute codes described in
section 3.3.3 are used in this category.
In general, if multiple attributes are needed to describe
a feature the ordering is not significant. An exception
occurs in coding highway route numbers. If a highway is
labeled BYP, ALT, BR, and so on, then the route number
parameter code should be preceded by the appropriate
descriptive code for Bypass, Alternate, or Business, and
so on. This is especially important if multiple
descriptive codes are required to describe a road, so that
the descriptive code may be associated with the proper
route number.
3.10.1.1 Transportation
The attribute codes authorized for use in digitizing
Transportation are in sections 3.10.1.2 through 3.10.1.4.
The instructions for use of the attribute codes are in
sections 3.10.2 through 3.10.4.
3.10.1.2 Roads and Trails - Major Code 170
o Node attribute codes
170 0001 Bridge abutment
170 0002 Tunnel portal
170 0004 Gate
170 0005 Cul-de-sac
170 0006 Dead end
170 0007 Drawbridge
o Area attribute codes
000 0000 Outside area
170 0100 Void area
o Line attribute codes
170 0201 Primary route, class 1, symbol undivided
170 0202 Primary route, class 1, symbol divided by
centerline
170 0203 Primary route, class 1, divided, lanes
separated
170 0204 Primary route, class 1, one way, other
than divided highway
170 0205 Secondary route, class 2, symbol
undivided
170 0206 Secondary route, class 2, symbol divided
by centerline
170 0207 Secondary route, class 2, divided, lanes
separated
170 0208 Secondary route, class 2, one way, other
than divided highway
170 0209 Road or street, class 3
170 0210 Road or street, class 4
170 0211 Trail, class 5, other than
four-wheel-drive vehicle
170 0212 Trail, class 5, four-wheel-drive vehicle
170 0213 Footbridge
170 0214 Road ferry crossing
170 0215 Perimeter of parking area
170 0216 Arbitrary line extension
170 0217 Road or street, class 3, symbol divided
by centerline
170 0218 Road or street, class 3, divided, lanes
separated
170 0219 Road or street, class 4, one way
170 0220 Closure line
170 0221 Road or street, class 3, one way
170 0222 Road in transition
170 0299 Processing line
o Single-point attribute codes
None
o General purpose attribute codes - node or line
170 0401 Traffic circle
170 0402 Cloverleaf or interchange
170 0403 Tollgate, toll plaza, or perimeter of
toll plaza
170 0404 Weigh station
170 0405 Nonstandard section of road
o Descriptive attribute codes
170 0601 In tunnel
170 0602 Overpassing, on bridge
170 0603 Under construction, classification known
170 0604 Under construction, classification
unknown
170 0605 Labeled "old railroad grade"
170 0606 Submerged or in ford
170 0607 Underpassing
170 0609 Toll road
170 0610 Privately operated or restricted use
170 0611 Proposed
170 0612 Double-decked
170 0613 In service facility, rest area, or
roadside park
170 0614 Elevated
170 0615 Bypass route
170 0616 Alternate route
170 0617 Business route
170 0618 On drawbridge
170 0619 Spur
170 0620 Loop
170 0621 Connector
170 0622 Truck route
170 0623 With railroad
170 0624 Covered
170 0650 Road width 46-55 feet, 0.025 inch at
1:24,000
170 0651 Road width 56-65 feet, 0.030 inch at
1:24,000
170 0652 Road width 66-75 feet, 0.035 inch at
1:24,000
170 0653 Road width 76-85 feet, 0.040 inch at
1:24,000
170 0654 Road width 86-95 feet, 0.045 inch at
1:24,000
170 0655 Road width 96-105 feet, 0.050 inch at
1:24,000
170 0656 Road width 106-115 feet, 0.055 inch at
1:24,000
170 0657 Road width 116-125 feet, 0.060 inch at
1:24,000
170 0658 Road width 126-135 feet, 0.065 inch at
1:24,000
170 0659 Road width 136-145 feet, 0.070 inch at
1:24,000
o Parameter attribute codes
170 0000 Photorevised feature
171 ---- Number of lanes
172 ---- Interstate route number
173 ---- U.S. route number
174 ---- State route number
175 ---- Reservation, park, or military route
number
176 ---- County route
177 XXYY Alphabetic portion of any route number
Substitute numeric equivalent of
alphabetic portion for XX and for YY as follows:
00 = blank, 01 = A, 02 = B, 03 = C, 04 = D,
05 = E, 06 = F, 07 = G, 08 = H, 09 = I, 10 = J,
11 = K, 12 = L, 13 = M, 14 = N, 15 = O, 16 = P,
17 = Q, 18 = R, 19 = S, 20 = T, 21 = U, 22 = V,
23 = W, 24 = X, 25 = Y, 26 = Z.
178 0000 Best estimate of position or
classification
179 00-- Coincident feature
3.10.1.3 Railroads - Major Code 180
o Node attribute codes
180 0001 Bridge abutment
180 0002 Tunnel portal
180 0007 Drawbridge
o Area attribute codes
000 0000 Outside area
180 0100 Void area
o Line attribute codes
180 0201 Railroad
180 0202 Railroad in street or road
180 0204 Carline
180 0205 Cog railroad, incline railway, or logging
tram
180 0207 Railroad ferry crossing
180 0208 Railroad siding or spur
180 0209 Perimeter or limit of yard
180 0210 Arbitrary line extension
180 0211 Closure line
180 0299 Processing line
o Single-point attribute codes
None
o General purpose attribute codes - node, line, or
degenerate line
180 0400 Railroad station, perimeter of station
180 0401 Turntable
180 0402 Roundhouse
o Descriptive attribute codes
180 0601 In tunnel
180 0602 Overpassing, on bridge
180 0603 Abandoned
180 0604 Dismantled
180 0605 Underpassing
180 0606 Narrow gauge
180 0607 In snowshed or under structure
180 0608 Under construction
180 0609 Elevated
180 0610 Rapid transit
180 0611 On drawbridge
180 0612 Private
180 0613 U.S. Government
180 0614 Juxtaposition
o Parameter attribute codes
180 0000 Photorevised feature
181 ---- Number of tracks
188 0000 Best estimate of position or classification
189 00-- Coincident feature
3.10.1.4 Pipelines, Transmission Lines, and Miscellaneous
Transportation Features - Major Code 190
o Node attribute codes
190 0001 End of transmission line at power
station, substation, or hydroelectric plant
190 0002 End of pipeline at oil or gas field
190 0003 End of pipeline at refinery, depot, or
tank farm
190 0004 Steel or concrete tower on transmission
line
o Area attribute codes
000 0000 Outside area
190 0100 Void area
o Line attribute codes
190 0201 Pipeline
190 0202 Power transmission line
190 0203 Telephone or telegraph line
190 0204 Aerial tramway, monorail, or ski lift
190 0205 Arbitrary line extension
190 0206 Closure line
190 0299 Processing line
o Single-point attribute codes
None
o General purpose attribute codes - node, line, or
degenerate line
190 0400 Power station
190 0401 Substation
190 0402 Hydroelectric plant
190 0403 Landing strip, airport, or perimeter of
airport
190 0404 Heliport, perimeter of heliport
190 0405 Launch complex, perimeter of launch
complex
190 0406 Pumping station or compressor station
190 0407 Seaplane ramp or landing area
190 0408 Measuring station, or valve station
o Descriptive attribute codes
190 0600 Underground
190 0601 Under construction
190 0602 Abandoned
190 0603 Above ground
190 0604 Labeled "closed"
190 0605 Unimproved, loose surface
190 0606 Submerged
190 0607 Nuclear
o Parameter attribute codes
190 0000 Photorevised feature
198 0000 Best estimate of position or
classification
199 00-- Coincident feature
3.10.2 Instructions for the Use of Attribute Codes for Roads and
Trails
3.10.2.1 Node Attribute Codes
170 0001 Bridge abutment
This code identifies a node placed on the central
point of a wing tick that indicates either end of
a bridge. The wing ticks are shown by symbols
137, 138, 146 (A); 112.83, 116.6 (B); 511.15(C);
or 2105.01, 2105.02 (D).
170 0002 Tunnel portal
This code identifies a node placed at the point of
a wing tick that indicates either end of a road
tunnel. The tunnel portal is indicated by symbols
139(A), 112.83(B), 511.17(C), or 2105.03(D). See
code 170 0601 for coding the tunnel.
170 0004 Gate
This code identifies a node placed on a tick line
labeled "gate," other than a tollgate, that
appears at the beginning of a controlled public
access road. The feature is shown on standard
quadrangles by the same tick as symbols 104(A) or
2103.06(D) although the label is different. This
code does not apply to 1:100,000-scale maps.
170 0005 Cul-de-sac
This code identifies a cul-de-sac shown by symbols
116.10, 121.10 (B); 511.29, 516.7 (C); or
2103.09(D). The symbol may be digitized as a node
or a line. When a cul-de-sac is less than or
equal to 0.030 inch in diameter, it is digi-tized
as a node and assigned this code. When the
feature is greater than 0.030 inch in diameter and
does not have an interior island, it is digitized
as a line. An unattributed node is placed at the
end of the road, and a line is digi-tized around
the perimeter of the cul-de-sac and identified by
this code and the appropriate road classification.
When the cul-de-sac is shown with an interior island,
the road that forms the cul-de-sac is digitized
and coded as appropriate for the road class and
is not identified by this code.
170 0006 Dead end
This code identifies a dead-end street that has
been closed with a tick as in symbols 116(A),
511.21, 511.22 (C), or 2105.07(D). This code
does not apply to 1:100,000-scale maps.
170 0007 Drawbridge
This code identifies a node that is digitized in
the center of the circle portion of the
drawbridge symbol: 138(A), 511.15, 516.11 (C),
or 2105.02(D). See code 170 0618 for coding the
road segments on both sides of the circle portion
of the drawbridge symbol. This code does not
apply to 1:100,000-scale maps.
3.10.2.2 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
170 0100 Void area
This code identifies an area on the source
material where no roads and trails data exist
because of replacement by imagery or a pattern
from another category. A void area is also found
beyond the national boundary to distinguish it
from the background area. Where appropriate, the
perimeter of the void area, usually a closure
line, is coded as coincident with the category
that defines the roads and trails void area. The
closure line that defines the void area beyond
the national boundary is coded as coincident with
the Boundaries category (179 0009).
3.10.2.3 Line Attribute Codes
170 0201 Primary route, class 1, symbol undivided
This code identifies a centerline digitized along
a class 1 highway that has no division indicated.
It is used for symbols 100, 101 (A), 121.1(B), or
511.10(C). It is also used for symbol 104(A)
when that symbol is scribed as shown, that is,
without a dividing line. It is also used for
symbol 2103.01(D) when labeled as an interstate
or U.S. Highway. Also use the appropriate width
code (see codes 170 0650 through 170 0659).
170 0202 Primary route, class 1, symbol divided by
centerline
This code identifies the centerline digitized
along a dual highway that is shown with three
road casings. If the road exceeds the standard
width for the map scale, add the appropriate road
width code. It is used when symbol 100(A) is
shown with the centerline division as is seen in
symbols 109(A) or 511.11(C). It is also
used for symbol 2103.02(D) when labeled as an
interstate or U.S. Highway. This code does not
apply to 1:100,000-scale maps.
170 0203 Primary route, class 1, divided, lanes separated
This code describes a centerline digitized in
each lane of a divided highway for which the
lanes are separated by a median strip. If the
road exceeds the standard width for the map
scale, add the appropriate road width code. This
code is used on symbols 110(A) or 511.11(C). The
code is also used on symbol 121.1(B) when the
road is separated into two lanes as described in
the remarks block of that symbol. It is used for
symbol 2103.02(D) when a median strip is shown on
roads labeled as an Interstate or U.S. Highway.
170 0204 Primary route, class 1, one-way, other than
divided highway
This code describes a centerline digitized in a
class 1 road that is designated for one-way
traffic by the placement of a directional arrow,
but is not part of a divided highway. This
situation usually occurs in urban areas in which
major through streets may be designated as
one-way and are shown by symbols 100, 101 (A),
121.1(B), or 511.10(C). It is also used for
symbol 2103.01(D) when labeled as an interstate
or U.S. highway and designated for one-way
traffic. Although one-way streets are not
explicitly symbolized on 1:100,000-scale maps,
this code is applied to a centerline digitized in
a class 1 road that is clearly one-directional.
170 0205 Secondary route, class 2, symbol undivided
This code describes a centerline digitized in a
class 2 road symbol that has no division of lanes
indicated. It is used for symbols 102, 103 (A),
121.2(B), or 511.10(C). This code is also used
for symbol 2103.01(D) when labeled
as a State or county highway. (State highways
depicted by this symbol also require the best
estimate code, 178 0000.)
170 0206 Secondary route, class 2, symbol divided by
centerline
This code describes a centerline digitized in a
second class dual highway shown with three road
casings as in symbols 109(A) or 511.11(C). This
code is also used for symbol 2103.02(D) when
labeled as a State or county highway. (State
highways depicted by this symbol also require the
best estimate code, 178 0000.) This code does
not apply to 1:100,000-scale maps.
170 0207 Secondary route, class 2, symbol divided, lanes
separated
This code describes a centerline digitized in
each lane of a class 2 highway that is shown with
lanes separated by a median strip as in symbols
110(A) or 511.11(C), but with the dashed fill as
in symbol 514(A). On 1:100,000-scale maps, the
code identifies each lane of highway as shown in
symbol 121.2(B). It is also used for symbol
2103.02(D) when labeled as a State or county
highway. (State highways also use the best
estimate code, 178 0000.)
170 0208 Secondary route, class 2, one way, other than
divided highway
This code describes a centerline digitized in a
class 2 highway that is designated as one way by
a directional arrow but is not part of a divided
highway. This generally occurs only in urban
areas. It is used for symbol 2130.01(D) when
labeled as a State or county highway and
designated for one-way traffic. (State highways
also use the best estimate code, 178 0000.)
Although one-way streets are not explicitly
symbolized on 1:100,000-scale maps, this code is
applied to a centerline digitized in a class 2
road that is clearly one-directional.
170 0209 Road or street, class 3
This code describes a centerline digitized in a
class 3 road or street shown by symbols 105(A),
116.1(B), or 516.1(C). It is also used for
symbol 2103.01(D) when unlabeled as to
administrative responsibility.
170 0210 Road or street, class 4
This code describes a centerline digitized in a
class 4 road or street shown by symbols 106(A),
116.2(B), 516.4(C), or 2103.11(D). This code is
also used for street patterns in built-up areas
on 1:100,000-scale maps shown by symbol 116.7(B).
170 0211 Trail, class 5, other than four-wheel drive
This code describes a line digitized along a
class 5 trail symbol that is not designated for
four-wheel-drive use. The trail symbol may be
labeled in various ways such as "foot trail,"
"pack trail," "bicycle trail," or "old railroad
grade." (Also see code 170 0605) This code is
used for symbols 107, 133 (A), 116.3(B),
516.5(C), or 2103.12(D).
170 0212 Trail, class 5, four-wheel drive
This code describes a line digitized along a
class 5 trail that is labeled "Jeep" or "4WD".
It is used on symbols 107(A), 116.3(B), 516.5(C),
or 2103.12(D).
170 0213 Footbridge
This code describes a line digitized along a
footbridge shown by symbols 140(A), 511.23(C), or
2105.04(D). The footbridge is digitized even
when the connecting footpaths are not shown. The
nodes that indicate the ends of the footbridge
are not given an attribute code. This code does
not apply to 1:100,000-scale maps.
170 0214 Road ferry crossing
This code describes a line digitized from bank to
bank along a ferry crossing route as shown in
symbols 150, 151 (A), 112.84(B), 511.24(C), or
2105.09(D).
170 0215 Perimeter of parking area
This code describes a line digitized along the
perimeter of an area usually labeled "parking
area" and shown by symbol 511.25(C). Many
parking areas are not labeled, but are obvious
because of their shape and proximity to such
features as retail centers and stadiums. The
limits of the parking area may be shown by a road
symbol in which case the appropriate road code
classification is used as well. If the perimeter
is shown by a cleared area then the apparent
limit of the parking area carries this code
alone. This code does not apply to
1:100,000-scale maps.
170 0216 Arbitrary line extension
This code is used on a portion of a linear
feature that is not symbolized, but is required
for connectivity of the feature, for example, a
line digitized to join portions of a road that is
broken for an underpass, as shown in symbols 145,
146 (A); 116.4, 116.7 (B); 516.10(C); and
2105.06(D). Road classes and route numbers are
also encoded on this line as appropriate.
170 0217 Road or street, class 3, symbol divided by
centerline
This code describes a centerline digitized in a
class 3 road or street that is shown with three
road casings to indicate that it is divided as is
shown in symbol 109(A) but without any red fill.
It is also used for symbol 2103.02(D) when
unlabeled as to administrative responsibility.
This code does not apply to 1:100,000-scale maps.
170 0218 Road or street, class 3, divided, lanes separated
This code describes a centerline digitized in
each lane of a class 3 road or street that is
shown with lanes separated by a median strip as
in symbols 110(A) or 516.2(C), but without any
red fill. It is also used for symbol 2103.02(D)
when unlabeled as to administrative
responsibility. This code does not apply to
1:100,000-scale maps.
170 0219 Road or street, class 4, one way
This code describes a centerline digitized in a
class 4 road that is designated as one way by a
directional arrow. A class 4 road is shown by
symbols 106(A), 116.2(B), 516.4(C), or
2103.11(D).
170 0220 Closure line
This code identifies a line segment digitized to
define the extent of an areal feature, such as a
void area, that is not otherwise explicitly
symbolized.
170 0221 Road or street, class 3, one way
This code identifies a centerline digitized in a
class 3 road that is designated as one way by a
directional arrow. A class 3 road is shown by
symbols 105(A), 116.1(B), or 516.1(C). Use this
code for symbols 2103.01 and 2103.02 (D) when
unlabeled as to administrative responsibility and
designated for one-way traffic.
170 0222 Road in transition
This code identifies a centerline digitized in a
section of any road where a change in the road
width occurs, and the transitional section is
equal to or greater than 0.25 inch in length. An
unattributed node is placed at the beginning and
end of the extent of the transitional
segment.
The road classification is assigned to the
transitional segment of the road for
connectivity.
170 0299 Processing line
Some routines in the processing software (PROSYS)
have limitations in the number of lines, nodes,
or areas that can be processed. For example, an
area may be associated with no more than 4,751
lines. This code describes a line or lines
digitized to segment the data within a file to
create more background areas, thereby enabling
large files to be processed.
3.10.2.4 Single-Point Attribute Codes
There are no single-point feature attribute codes in this
category.
3.10.2.5 General Purpose Attribute Codes - node or line
170 0401 Traffic circle
This code describes the marked-off area at the
center of a junction of roads (three or more)
that forms a circle around which traffic normally
moves in one direction (not to be confused with
a cul-de-sac). If the diameter of the interior
space in the circle is 0.030 inch or less the
feature is digitized as a node at the
intersection of the roads entering the circle.
If the interior space is greater than 0.030 inch
then the feature is digitized as a center-line
that follows the circle and is broken by
unattributed nodes at the points where the roads
join the circle. Road classes and route numbers
are also encoded on this centerline as
appropriate. This code is used on symbols
114(A); 116.10, 121.10 (B); 511.28, 516.6 (C); or
2103.09(D).
170 0402 Cloverleaf or interchange
This code describes an intersection of roads and
ramps at a cloverleaf or interchange. If the
cloverleaf is shown by symbol 115(A) at the
symbol size shown, the feature is digitized as a
node and described by this code. If the
cloverleaf or interchange is shown to scale, or
larger than symbol size as shown in symbols
121.5(B), 511.13, 516.8 (C), or 2103.10(D), then
the feature is digitized by a line that follows
the road and ramp pattern and is described by
this code. A cloverleaf or interchange generally
does not carry a road class or route number.
170 0403 Tollgate, toll plaza, or perimeter of toll plaza
This code identifies a node placed at the center
of a tick placed on a road to identify a tollgate.
It is shown by symbols 104(A), 511.26(C), or
2103.06(D). It also identifies a line digitized
around an area on a toll road that is labeled
"toll plaza." If the exact extent of the plaza is
difficult to determine also use code 178 0000.
The centerline digitized for the road should be
continued through the feature.
170 0404 Weigh station
This code identifies a feature labeled "weigh
station" or "Agricultural Inspection Station." On
1:100,000-scale maps the feature is shown by
symbol 121.9(B) and digitized as a line. On
1:24,000-scale maps several treatments may be used
depending on the size of the feature. If shown by
a road or ramp only, digitize a line. If shown in
a similar manner to a large toll plaza, digitize
a line around the perimeter of the feature. If
depicted by a located object symbol or building
without ramps or roads shown, digitize as a
degenerate line.
170 0405 Nonstandard section of road
This code describes a line digitized on the
casings of a nonstandard section of any class road
normally symbolized by parallel road casings. An
unattributed node is placed on the ends of the
centerline digitized on either side of the
nonstandard section of road, and the casings
delineating the nonstandard section are digitized
by using this code. A road classification or
route number is not assigned to the lines
digitized as nonstandard section of road.
However, for connectivity, the road classification
and route number (if applicable) are assigned
to the digitized centerline of the standard
section of the road that
continues through the unattributed nodes. This
description also applies to the nonstandard
section of the road shown at a road junction,
without an island, where it widens to 0.060 inch
or more. When the nonstandard section of the
road shown by a circle (not to be confused with
the cul-de-sac or traffic circle) is 0.030 inch or
less in diameter, a node is digitized in the
center of the rounded section of the road and
assigned this code.
3.10.2.6 Descriptive Attribute Codes
170 0601 In tunnel
This code describes the portion of a road or trail
that is shown as being in a tunnel by symbols
139(A); 121.7, 116.5 (B); 511.16, 511.17, 516.12
(C); or 2105.03(D). The code applies only to the
portion between the wing ticks (see 170 0002 for
coding the wing ticks). Also use the road
classification code.
170 0602 Overpassing, on bridge (except drawbridge)
This code describes the section of a road or trail
that passes over, rather than intersects, another
feature, such as when a road crosses over a river
or railroad on a bridge. The code is applied only
to the section of a feature that is raised to
cross the obstruction. In some cases the
relationship of the two features is more simply
shown by coding the underpassing portion (see code
170 0607) because only one of the two conditions
need be coded. It is used with symbols 137, 138,
146 (A); 116.6, 121.8 (B); 511.15, 516.11 (C), or
2105.01, 2105.02 (D). See code 170 0618 for
treatment of a feature on a drawbridge.
170 0603 Under construction, classification known
This code describes the portion of a road that is
labelled "under construction" and the class of the
road is known. It is used in conjunction with the
code that describes the class of the road. The
code is used on symbols 112(A), 511.12(C), or
2103.08(D), for which the red fill indicates the
class of the road. On 1:100,000-scale maps only
class 1 roads under construction are shown,
therefore, this code is used only on symbol
121.3(B). The exact extent of the construction is
not indicated on 1:100,000-scale maps. In such
cases, apply the code to all sections of the road,
extending from the label in both directions, until
an intersection with another road or the edge of an
urban tint provides a reasonable limit to the
portion of the road considered to be under
construction.
170 0604 Under construction, classification unknown
This code describes a road labeled "under
construction" for which the classification is
unknown. The code is used on symbols 113(A) or
2103.08(D). This code is not used on
1:100,000-scale maps.
170 0605 Labeled "old railroad grade"
This code describes a trail that follows the
alignment of a dismantled railroad and is labeled
"old railroad grade." The code is used on symbols
133(A), 116.3(B), 516.5(C), or 2104.12(D), in
conjunction with 170 0211. No code from the
railroad subcategory is used on this feature.
170 0606 Submerged or in ford
This code describes the portion of a road or trail
that fords a stream. The code is used on symbols
147, 148, 149 (A); 516.13(C); or 2105.08(D). In
the case of a ford through a single-line stream,
the code is applied to a node placed at the point
where the road or trail intersects the stream.
This code is not used on 1:100,000-scale maps.
170 0607 Underpassing
This code describes the section of a road or trail
that passes under, rather than intersects, another
feature, as when a road crosses under another road
that is on an overpass. The code is applied only
to the underpassing portion of a longer feature or
to the section of a feature that is broken to pass
under an obstruction. In some cases the
relationship of the two features is more simply
shown by coding the overpassing portion (see code
170 0602) because only one of the two conditions need
be coded. This code is used with symbols 145(A);
116.4, 121.6 (B); 511.14, 516.10 (C); or 2105.06(D).
170 0609 Toll
This code describes a road that is labeled "toll
road." It is used on symbols 104(A), 121.1(B), or
2103.06(D).
170 0610 Privately operated or restricted use
This code describes a road or trail that is
restricted, such as a road through a military
reservation, a road or trail through a ranch, or
a fire road in a forest preserve. These roads are
labeled "private" or "restricted" and may have a
gate shown at the point where the restriction
begins. This code also describes a road or trail
that is not labeled but is only accessible by way
of a road labeled "private" or "restricted."
170 0611 Proposed
This code describes a road that has been planned
and sufficient information was available to show
the proposed location on the map. Such a road is
shown by symbols 516(A) or 521.3(C) and is labeled
"proposed location." This code is not used on
1:100,000-scale maps.
170 0612 Double-decked
This code describes a road that is constructed
over another road or a road on a two-level bridge.
The double-decked structure is shown by the
standard road symbol appropriate to its class,
symbol 2103.03(D), and is labeled "double-decked."
This code is not used on 1:100,000-scale maps.
170 0613 In service facility, rest area, or roadside park
This code identifies a road that runs through a
service facility or rest area. On 1:24,000- and
1:25,000-scale maps the facility is labeled
"service facility," "service area," "service
plaza," "rest area" or "roadside park," shown by
symbols 511.18 or 516.9(C). No specific symbol is
shown in reference A. On 1:100,000-scale maps the
facility is shown by symbols 116.8(B) or 121.9(B),
scribed to scale. The service facility roads are
usually distinguished by a different line weight
from that of the main road and do not require a
road class.
170 0614 Elevated
This code describes a road that is labeled
"elevated" to indicate that it is raised above
ground level. This code is not used on bridges.
(See 170 0602)
170 0615 Bypass
This code describes a road that is identified as
a bypass route by the presence of the letters
"BYP" in the highway route marker. This code is
used in addition to and precedes the parameter
code that contains the route number.
170 0616 Alternate
This code describes a road that is identified as
an alternate route by the presence of the letters
"ALT" in the highway route marker. This code is
used in addition to and precedes the parameter
code that contains the route number.
170 0617 Business
This code describes a road that is identified as
a business route by the presence of the letters
"BR" in the highway route marker. This code is
used in addition to and precedes the parameter
code that contains the route number.
170 0618 On drawbridge
This code describes a centerline digitized along
the portion of a road that crosses an obstruction,
usually a water area, on a drawbridge shown by
symbols 138(A) or 2105.02(D). See code 170 0007
for coding the circular portion of the drawbridge
symbol. This code does not apply to 1:100,000-
scale maps.
170 0619 Spur
This code identifies a road that is described as
a spur route by the presence of the word "Spur" in
the highway route marker. This code is used in
addition to and precedes the parameter code that
contains the route number.
170 0620 Loop
This code identifies a road that is described as
a loop route by the presence of the word "Loop" in
the highway route marker. This code is used in
addition to and precedes the parameter code that
contains the route number.
170 0621 Connector
This code identifies a road that is described as
a connector route by the presence of the word
"Conn" in the highway route marker. This code is
used in addition to and precedes the parameter
code that contains the route number.
170 0622 Truck route
This code identifies a road that is described as
a truck route by the presence of the abbreviation
"TR" in the highway route marker. This code is
used in addition to and precedes the parameter
code that contains the route number.
170 0623 With railroad
This code describes a section of a road or street
where the railroad is superimposed on the road as
shown by symbols 124(A), 112.25(B), 512.08, 512.09
(C), or 2104.07(D). Also use the appropriate road
classification code. Because the description
indicates coincidence with a railroad, the
coincident feature code is not required.
170 0624 Covered
This code describes a feature that is labeled
"covered."
170 0650 Road width 46-55 feet, 0.025 inch at 1:24,000
170 0651 Road width 56-65 feet, 0.030 inch at 1:24,000
170 0652 Road width 66-75 feet, 0.035 inch at 1:24,000
170 0653 Road width 76-85 feet, 0.040 inch at 1:24,000
170 0654 Road width 86-95 feet, 0.045 inch at 1:24,000
170 0655 Road width 96-105 feet, 0.050 inch at 1:24,000
170 0656 Road width 106-115 feet, 0.055 inch at 1:24,000
170 0657 Road width 116-125 feet, 0.060 inch at 1:24,000
170 0658 Road width 126-135 feet, 0.065 inch at 1:24,000
170 0659 Road width 136-145 feet, 0.070 inch at 1:24,000
The 10 codes listed above are used to describe a
road that is scribed to scale rather than shown by
the standard size symbol on 1:24,000-scale maps.
This code is used in addition to the code that
describes the class of the road. At
1:24,000-scale, roads greater than 40 feet and
dual highways greater than 70 feet are scribed to
scale. This code does not apply to 1:100,000-
scale maps.
3.10.2.7 Parameter Attribute Codes
170 0000 Photorevised feature
This code is described in section 3.3.3.
171 ---- Number of lanes
This code is used to encode the number of lanes
annotated on a road on the source map. The number
of lanes is entered in the spaces, flush right,
one to four digits. Use this code on all segments
of a road to which the annotated number of lanes
applies.
172 ---- Interstate route number
This code is used to encode the route number of an
interstate highway. Enter the number shown on the
highway route marker in the spaces, flush right,
one to four digits. If the route number contains
alphabetic characters also use 177 XXYY. If the
highway is labeled BYP, ALT, or BR, this parameter
code should be preceded by the appropriate
descriptive code, such as 170 0615, 170 0616, or
170 0617 respectively. Do not encode the
uppercase "I" that is sometimes associated with an
interstate highway, as this parameter code imparts
that information.
173 ---- U.S. route number
This code is used to encode the route number of a
U.S. highway. Enter the number shown on the
highway route marker in the spaces, flush right,
one to four digits. If the route number contains
alphabetic characters also use code 170 XXYY. If
the highway is labeled BYP, ALT, or BR, this
parameter code, should be preceded by the
appropriate descriptive code, such as 170 0615,
170 0616, or 170 0617 respectively. Do not encode
the uppercase "US" that is sometimes associated
with a U.S. highway, as this parameter code
imparts that information.
174 ---- State route number
This code is used to encode the route number of a
State highway. Enter the number shown on the
highway route marker in the spaces, flush right,
one to four digits. If the route number contains
alphabetic characters also use code 177 XXYY. If
the highway is labeled BYP, ALT, or BR, this
parameter code, should be preceded by the
appropriate descriptive code, such as 170 0615,
170 0616, or 170 0617 respectively. Do not encode
the uppercase "SR" that is sometimes associated
with a State highway, as this parameter code
imparts that information.
175 ---- Reservation, park, or military route number
This code is used to encode the route number of a
reservation, park, or military route number.
Enter the number shown on the highway route marker
in the spaces, flush right, one to four digits.
If the route number contains alphabetic characters
also use code 177 XXYY. If the highway is labeled
BYP, ALT, or BR, this parameter code, should be
preceded by the appropriate descriptive code, such
as 170 0615, 170 0616, or 170 0617 respectively.
This code is not used on 1:100,000-scale maps.
176 ---- County route number
This code is used to encode a county route number.
Enter the number shown on the highway route marker
in the spaces, flush right, one to four digits.
If the route number contains alphabetic characters
also use code 177 XXYY. If the highway is labeled
BYP, ALT, or BR, this parameter code should be
preceded by the appropriate descriptive code, such
as 170 0615, 170 0616, or 170 0617 respectively.
This code is not used on 1:100,000-scale maps.
177 XXYY Alphabetic portion of any route number
This code is used to encode the alphabetic portion
of any route number. The code is used in
conjunction with the appropriate code, 172 ----
through 176 ----, if the route designation is
mixed numeric and alphabetic. The code can hold
one or two letters by substituting the numeric
equivalent 01 to 26 for the letters A to Z with 00
substituting for a blank. If one letter is
encoded it is entered in the YY portion of the
code with blank coded into the XX portion. The
code precedes or follows the numeric route code in
accordance with its actual position. In the case
of an entirely alphabetic route designator, also
use the code to specify jurisdiction with 0000
entered into the minor code.
Examples:
State Route B143 = 177 0002 174 0143
County Route 6R = 176 0006 177 0018
U.S. Route A1A = 177 0001 173 0001 177 0001
State Route KK = 177 1111 174 0000
Do not use this code to represent "ALT", "BR",
"BYP", "I" (interstate), "SR" (state route), or
"U.S." (United States) as these qualifiers of the
route number are encoded by other codes. For
example: Alternate U.S. route 1 would be coded
170 0616 173 0001.
178 0000 Best estimate of position or classification
This code is described in section 3.3.3.
179 00-- Coincident feature
This code is described in section 3.3.3. One
example for this category is a road on a dam
(shown by symbols 155(A), 112.65(B), or
2108.04(D)) that has the code 179 0005
assigned to it, in addition to the codes that
describe the road.
3.10.3 Instructions for the Use of Attribute Codes for Railroads
3.10.3.1 Node Attribute Codes
180 0001 Bridge abutment
This code describes a node placed on the central
point of a wing tick that indicates either end of
a railroad bridge. The wing ticks are shown by
symbols 141, 142, 143 (A); 112.17(B); 512.21(C);
or 2105.02, 2105.05 (D). For any symbol in which
the tick is represented by two lines meeting at an
acute angle, the node is placed at the point. For
any symbol in which the tick is represented by two
lines meeting a third line at obtuse angles, the
node is centered on the middle line.
180 0002 Tunnel portal
This code identifies a node placed at the point of
a wing tick that indicates either end of a
railroad tunnel. The tunnel portal is indicated
by symbols 144(A), 112.19(B), 512.21(C), or
2105.03(D).
180 0007 Drawbridge
This code identifies a node that is digitized in
the center of the circle portion of the drawbridge
shown by symbols: 143(A), 512.21(C), or
2105.02(D). See code 180 0611 for coding the
railroad segments on both sides of the circle
portion of the drawbridge symbol. This code does
not apply to 1:100,000-scale maps.
3.10.3.2 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
180 0100 Void area
This code identifies an area on the source
material where no railroad data exist because of
replacement by imagery or a pattern from another
category. A void area is also found beyond the
national boundary to distinguish it from the
background area. Where appropriate, the perimeter
of the void area, usually a closure line, is coded
as coincident with the category whose pattern
defines the void area. The closure line that
defines the void area beyond the national boundary
is coded as coincident with the Boundaries
category (189 0009).
3.10.3.3 Line Attribute Codes
180 0201 Railroad
This code describes a railroad line shown by
symbols 117 through 123, 127 through 130 (A);
112.11 through 112.14 (B); 512.1 through 512.5,
512.10 through 512.13 (C); or 2104.01 through
2104.06, 2104.10, 2104.11 (D). Unless qualified by
a descriptive or parameter code, this code
indicates a single-track, standard-gauge operating
railroad line. If the symbol denotes a
multiple-track railroad line, the centerline of
the symbol is digitized by using this code as well
as the appropriate parameter code to indicate the
number of tracks.
180 0202 Railroad in street
This code describes a railroad located on a
street. It is shown by symbols 124(A), 112.25(B),
512.8, 512.9 (C), or 2104.07(D), where the street
symbol is superimposed on the railroad symbol.
Because the definition of this code
indicates coincidence with a street, the
coincident feature code is not used in this case.
180 0204 Carline
This code describes a carline shown by symbols
131, 132, 133 (A); 112.27(B); or 512.14, 512.15
(C). If the feature is labeled as "abandoned,"
"dismantled," and so on, use the appropriate
descriptive code in addition to this code. This
code does not apply to provisional edition maps.
180 0205 Cog railroad, incline railway, or logging tram
This code describes a special purpose railroad
such as a cog railroad, incline railway, or
logging tram as shown by symbols 188(A),
112.23(B), 512.24(C), or 2110.02(D). If the
feature is labeled "abandoned," "dismantled," and
so on, use the appropriate descriptive code in
addition to this code.
180 0207 Railroad ferry crossing
This code describes a line digitized from bank to
bank along a ferry crossing route as shown in
symbols 150(A), 112.21(B), 512.23(C), or
2105.09(D).
180 0208 Railroad siding, or spur
This code describes a railroad siding that is one
or more single tracks branching off from a main
line of a railroad and shown by symbols 126(A),
112.16(B), 512.7(C), or 2104.09(D). This code
also describes a spur that is single track that
diverges from the main track and leads to some
facility such as an industrial point. In both
references the siding or spur is shown with a line
weight of 0.003 inch to distinguish it from the
main line, which is shown by a line weight of
0.005 inch. A railroad siding or spur may be of
any length.
180 0209 Perimeter or limit of yard
A railroad yard as shown in symbols 125(A),
112.15(B), 512.6(C), or 2104.08(D) is mapped to
scale with the main line through the yard and the
outermost tracks that form the perimeter shown in
true position. The rest of the tracks in the yard
are shown by a representative pattern. Therefore
the outline of the yard is digitized as a line, by
following the outermost tracks, given this code.
The open end of the yard is closed off by a
digitized line given this code and the code 180
0210. The main line is digitized and described by
the appropriate railroad code where it can be
distinguished. Large railroad yards may have
interior islands or clear areas, that are not
occupied by the track pattern. These area limits
are digitized as a line by following the innermost
track and identified with this code.
180 0210 Arbitrary line extension
This code is used on a portion of a linear feature
that is not symbolized; for example, this code may
be used to identify a line digitized to complete
or join portions of linear features, as in the
underpass shown in symbols 145(A), 512.20(C), or
2105.06(D). This code is used in addition to the
primary code.
180 0211 Closure line
This code identifies a line segment digitized to
define the extent of an areal feature, such as a
void area, that is not otherwise explicitly
symbolized.
180 0299 Processing line
Some routines in the processing software (PROSYS)
have limitations on the number of lines, nodes, or
areas that can be processed. For example, an area
may be associated with no more than 4,751 lines.
This code describes the
line or lines digitized to segment the data within
a file to create more background areas, thereby
enabling large files to be processed.
3.10.3.4 Single-Point Attribute Codes
There are no single-point attribute codes in this category.
3.10.3.5 General Purpose Attribute Codes - node, line, or
degenerate line
180 0400 Railroad station, perimeter of station
This code is used to describe a structure labeled
railroad station. If the station is shown by
symbols 136(A), 112.18(B), 512.18(C), or
2104.14(D), the station is digitized as a node on
the line that represents the railroad. If the
structure is less than 0.030 inch and separated by
a gap in the line, it is digitized as a degenerate
line. If the station is shown to scale, then a
line is digitized that defines the perimeter of
the station and is assigned this code.
180 0401 Turntable
This code is used to describe a railroad
turntable. If the turntable is shown by symbols
134(A), 512.17(C), or 2104.13(D) and is 0.06 inch
in diameter, it is digitized as a node on the
railroad line. If the turntable is shown to scale
then it is digitized as a line that defines the
circumference of the turntable. This code is not
used on 1:100,000-scale sources.
180 0402 Roundhouse
This code is used to describe a railroad
roundhouse as shown by symbols 135(A), 112.22(B),
512.16(C), or 2104.13(D).
Digitize a line that defines the perimeter of the
roundhouse and give it this code.
3.10.3.6 Descriptive Attribute Codes
180 0601 In tunnel
This code describes the portion of a railroad
that is shown as being in a tunnel by symbols
144(A), 112.19(B), 512.22(C), or 2105.03(D). The
code applies only to the portion of the railroad
feature between the wing ticks. The code is used
in addition to the codes that describe the
railroad type.
180 0602 Overpassing, on bridge (except drawbridge)
This code describes the section of a railroad
that passes over, rather than intersects, another
feature, as when a railroad crosses over a river
or a road on a bridge. The code is applied only
to the section of a feature that is raised to
cross an obstruction. In some cases the
relationship of the two features is more simply
shown by coding the underpassing portion (see
code 180 0605) because only one of the two
conditions need be coded. It is used with
symbols 141, 142, 143 (A); 112.17(B); 512.21(C);
or 2105.02, 2105.05 (D). See code 180 0611 for
treatment of a feature on a drawbridge.
180 0603 Abandoned
This code is used to describe any railroad that
is labeled "abandoned." An abandoned railroad is
one for which the tracks and roadbed are still in
place, although unused and of varying conditions.
It is used with symbol 112.24(B).
180 0604 Dismantled
This code describes a railroad that is labeled
"dismantled." The term dismantled means that
the tracks have been removed. Many railroads that
are dismantled are labeled "old railroad grade"
and are used and symbolized as trails on the
Roads and Trails subcategory. These trails are
not to be collected in the Railroad subcategory.
Only features actually labeled "dismantled" are
to be collected as a railroad feature, such as
dismantled logging trams.
180 0605 Underpassing
This code describes the section of a railroad
that passes under, rather than intersects,
another feature, as when a railroad crosses under
a road that is on an overpass. The code is
applied only to the underpassing portion of a
longer feature or to the section of a feature
that is broken to pass under an obstruction. In
some cases the relationship of the two features
is more simply shown by coding the overpassing
portion (see code 180 0602) because only one of
the two conditions need be coded. It is used
with symbols 145(A), 112.20(B), 512.20(C), or
2105.06(D).
180 0606 Narrow gauge
This code is used to describe any railroad that
is shown by symbols 127 through 130 (A); 112.13,
112.14 (B); 512.10 through 512.13 (C); or
2104.10, 2104.11 (D). This code is used in
addition to the line code that defines the
feature as a railroad.
180 0607 In snowshed or under structure
This code is used to describe any portion of a
railroad that is shown with a snowshed as in
symbols 177(A), 112.26(B), 512.19(C), or 2106.06
(D) or that is shown as running through a
building in the same way. The railroad in the
snowshed or building is digitized as a
centerline in the symbol, and the building is
collected in the manmade features category.
180 0608 Under construction
This code is used to describe any feature that is
labeled "under construction."
180 0609 Elevated
This code is used to describe any feature that is
labeled "elevated."
180 0610 Rapid transit
Rapid transit railroad lines are shown by the
standard railroad symbol appropriate to the
feature but, in addition, are labeled "rapid
transit." This code is used to describe symbols
117, 120 (A); 112.11, 112.12 (B); or 2104.01,
2104.04 (D), when labeled "rapid transit."
180 0611 On drawbridge
This code describes the portion of a railroad
that crosses an obstruction, usually water, on a
drawbridge shown by symbols 143(A), 512.21(C), or
2105.02(D). This code does not apply to
1:100,000-scale maps. The digitized railroad on
drawbridge is divided by a node placed in the
circular portion of the drawbridge symbol and
coded with code 180 0007.
180 0612 Private
This code describes a railroad labeled "private."
180 0613 U.S. Government
This code describes a railroad labeled as
belonging to the U.S. Government.
180 0614 Juxtaposition
This code describes a railroad shown by symbol
123(A) or 2104.06(D). The juxtaposition of
railroad tracks outside of a railroad yard
indicates that more than one railroad company
shares the roadbed. Each railroad is digitized
as described under "Railroad" (180 0201) and this
code is used on each line of the railroad
digitized. On 1:100,000-scale maps a similar
treatment is used to indicate juxtaposition.
3.10.3.7 Parameter Attribute Codes
180 0000 Photorevised feature
This code is described in section 3.3.3.
181 ---- Number of tracks
This code is used to encode the number of tracks
for a multiple track railroad as shown in symbols
121 through 123 (A); 512.3, 512.4 (B); 112.12(C);
or 2104.4(D). The number of tracks is entered in
the spaces, flush right, one to four digits. Use
this code on all segments of a railroad to which
the track number applies. Do not attempt to
encode the number of tracks shown in railroad
yards.
188 0000 Best estimate of position or classification
This code is described in section 3.3.3.
189 00-- Coincident feature
This code is described in section 3.3.3.
3.10.4 Instructions for the Use of Attribute Codes for Pipelines,
Transmission Lines, and Miscellaneous Transportation
Features
3.10.4.1 Node Attribute Codes
190 0001 End of transmission line at power station,
substation, or hydroelectric plant
This code describes a node placed at the end of
a transmission line that terminates at a power
station, substation, or power plant. Do not use
this code when the termination point is not
identified.
190 0002 End of pipeline at oil or gas field
This code describes a node placed at the end of
a pipeline that terminates at an oil or gas
field. The code is used only when the area that
is labeled oil field or gas field is not
separated from the termination point by any other
feature.
190 0003 End of pipeline at refinery, depot, or tank farm
This code describes a node placed at the end of
a pipeline that terminates at a labeled refinery
or depot. It is also used when the pipeline
terminates at a group of tanks that make up a
tank farm, whether labeled or not.
190 0004 Steel or concrete tower on transmission line
This code describes a node placed on a steel or
concrete tower, that is located on a transmission
line, shown by an open square as in symbols
512.91(C) and 2110.01(D).
3.10.4.2 Area Attribute Codes
000 0000 Outside area
This code is described in section 3.3.3.
190 0100 Void area
This code identifies an area on the source
material where no miscellaneous transportation
data exist because of replacement by imagery or
a pattern from another category. A void area is
also found beyond the national boundary to
distinguish it from the background area. Where
appropriate, the perimeter of the void area,
usually a closure line, is coded as coincident
with the category whose pattern defines the void
area. The closure line that defines the void
area beyond the national boundary is coded as
coincident with the Boundaries category (199
0009).
3.10.4.3 Line Attribute Codes
190 0201 Pipeline
This code describes a pipeline that is shown by
symbols 190, 191 (A); 112.57, 112.58 (B); 512.93,
512.94, 516.23 (C); or 2110.04(D). When shown by
symbols 190(A), 512.94(C), or the first
illustration for 112.58(B), this code is used
alone. When the pipeline is shown by symbols
191(A), 112.57(B), or 512.93(C), which indicates
that it is above ground, then use the descriptive
code 190 0603 in addition to this code. When the
pipeline is submerged as shown in the
illustration for symbols 116.12(B) or 512.94,
516.23 (C), also use the descriptive code 190
0606.
190 0202 Power transmission line
This code describes a power transmission line
that is shown by symbols 187(A), 112.55(B),
512.91(C), or 2110.01(D). The steel or concrete
towers are digitized as attributed nodes (see
code 190 0004). If an underground power line
is shown and labeled "underground," then use the
descriptive code 190 0600 in addition to this
code.
190 0203 Telephone or telegraph line
This code is used to describe a telephone or
telegraph line shown by symbols 189(A),
112.54(B), 512.90(C), or 2110.03(D). These
symbols are labeled "telephone" or "telegraph,"
but for coding purposes, no distinction is made
between telephone and telegraph lines.
190 0204 Aerial tramway, monorail, or ski lift
This code describes an aerial tramway, monorail,
or ski lift shown by symbols 188(A), 112.59(B),
512.95(C), or 2110.02(D) and labeled as to type.
190 0205 Arbitrary line extension
This code describes an arbitrary line that is not
symbolized on the map but is digitized to link
component symbolized features into pipeline or
transmission line networks. For example, a power
generating station located on the opposite side
of a road from its associated transmission lines
should be connected by a digitized line and given
this code. This code is used in addition to the
primary code.
190 0206 Closure line
This code identifies a line segment digitized to
define the extent of an areal feature, such as a
void area, that is not otherwise symbolized.
190 0299 Processing line
Some routines in processing software (PROSYS)
have limitations on the number of lines, nodes,
or areas that can be processed. For example, an
area may be associated
with no more than 4,751 lines. This code
describes a line or lines digitized to segment
the data within a file to create more background
areas, thereby enabling large files to be
processed.
3.10.4.4 General Purpose Attribute Codes - node, line, or
degenerate line
190 0400 Power station or power plant
This code describes a power station that is shown
by a building symbol appropriate to the size of
the structure and labeled as a "power plant" or
"power station." If the structure is less than
0.030 inch at its widest dimension and is joined
to a power transmission line, it is digitized as
a node at the end of the line. If the structure
is less than 0.030 inch and separated by a gap
from the end of the power transmission line, it
is digitized as a degenerate line. If the
structure is greater than 0.030 inch in any
dimension, the outline of the structure is
digitized as a line.
190 0401 Substation
This code describes a substation that is shown by
symbols 112.56(B), 512.92(C), or 211.13(D). The
feature is labeled "substation" or "substa." The
feature is digitized as a node if the symbol is
less than 0.030 inch and joined to the power
transmission line, as a degenerate line if less
than 0.030 inch and not joined to the power
transmission line, and as a line that defines the
perimeter of the substation if the symbol is
greater than 0.030 inch in any dimension. The
buildings inside the complex are collected in the
Manmade Features category.
190 0402 Hydroelectric plant
This code is used to describe a hydroelectric
plant shown by a building symbol appropriate to
the size of the structure and labeled
"hydroelectric plant." The feature is digitized
according to the same instructions as given
for code 190 0400.
190 0403 Landing strip, airport, or perimeter of airport
This code is used to describe a landing strip,
airport, or the perimeter of an airport. When
shown by symbols 116.16(B), 516.26(C), or
2110.08(D) the feature is digitized by a line
that follows the runway pattern shown on the map.
If the symbol is more than 0.010 inch wide,
digitize the outline of the runways. On
1:24,000-scale maps the extent of the airport may
be shown by a dashed line around the perimeter,
as shown in symbols 209(A) or 2107.06 (D); the
runways may be defined by a solid line, as shown
by symbol 2110.08(D); or the runways may be shown
by a screened area, with a solid line defining
the perimeter of the taxiways and aprons, as
shown by symbols 511.31(C) or 516.26(C).
Digitize lines to define the runways, taxiways,
aprons, and the boundary of the airport if
available. If it is not possible to distinguish
the runway, taxiway, or apron boundaries from
adjacent access roads or other features, digitize
the airport boundary only. If a landing strip is
shown by a single line then digitize the line.
Add code 190 0605 if the line is dashed to
indicate a loose or turf surface as shown by
symbol 511.30(C). If the perimeter of the
airport is not clear and the runways are not
shown, then place a degenerate line in the
approximate center of the airport or landing
field and identify it with this code and with
code 198 0000.
190 0404 Heliport, perimeter of heliport
This code describes a heliport facility. A
heliport is shown by symbols 198, 209 (A); 112.4,
116.15 (B); 511.32, 511.33 (C); or 2111.16(D).
When shown by symbols 198(A),
112.4(B), or 511.33(C), which are the located
object symbols, the feature is digitized as a
degenerate line. If shown by symbols 209(A) or
116.15(B), then the feature is digitized as a
line that defines the perimeter of the heliport.
Symbol 511.32(C) illustrates a solid line around
the perimeter of the facility and is digitized as
an area.
190 0405 Launch complex, perimeter of launch complex
This code describes a feature that is labeled
launch complex. There is no standard symbol for
this feature. If the limit of the complex is
discernible, digitize a line to define the
perimeter. If the limit is not clearly defined,
digitize a degenerate line in the approximate
center of the facility and identify it with this
code and with code 198 0000.
190 0406 Pumping station or compressor station
This code describes a pumping station or
compressor station associated with a gas or oil
pipeline. If the feature is shown by a dot on
the pipeline, digitize a node and use this code.
If the feature is shown separated from the
pipeline, digitize it as a degenerate line and
describe it with this code. If the feature is
shown by symbol 512.67(C), digitize a line by
following the perimeter of the area labeled
"pumping station" and give it this code. The
buildings inside the complex are collected in the
Manmade Features category.
190 0407 Seaplane ramp or landing area
This code describes a seaplane ramp or landing
area that is shown by a variety of treatments on
the 1:24,000-scale map and labeled. The feature
is digitized by a centerline in a landing strip
or a line around the perimeter of a ramp
depending on the way the feature is shown.
190 0408 Measuring station, or valve station
This code describes a measuring station or valve
station associated with a gas or oil pipeline
that is shown by a building symbol appropriate to
the size of the structure and labeled. This
feature is digitized according to the same
instructions as given for code 190 0400.
3.10.4.5 Descriptive Attribute Codes
190 0600 Underground
This code describes a feature that is labeled
"underground." It is not used for a pipeline
that is assumed to be an underground feature.
190 0601 Under construction
This code describes any feature that is labeled
"under construction."
190 0602 Abandoned
This code describes any feature that is labeled
"abandoned."
190 0603 Above ground
This code describes any feature that is labeled
"above ground." It is not used on the features
that by definition are assumed to be above
ground.
190 0604 Closed
This code describes any feature that is labeled
"closed."
190 0605 Unimproved, loose surface
This code describes an aircraft landing strip
that is shown by a dashed line to indicate a
loose surface. This code does not apply to
1:100,000-scale maps.
190 0606 Submerged
This code describes a pipeline that is submerged.
190 0607 Nuclear
This code describes a power plant that is labeled
"nuclear."
3.10.4.6 Parameter Attribute Codes
190 0000 Photorevised feature
This code is described in section 3.3.3.
198 0000 Best estimate of position or classification
This code is described in section 3.3.3.
199 00-- Coincident feature
This code is described in section 3.3.3.
(Current version containing all Changes through 4/7/94)
3.11 MANMADE FEATURES--MAJOR CODE 200
3.11.1 General Principles
The purpose in digitizing manmade features is to collect
information on the cultural features not included in the
other data categories described in this standard. The
information is gathered in a manner that permits the
extraction and derivation of data to satisfy the needs of
the various data users.
The symbolization of the features collected in this
category varies according to the scale of the map and the
size of the feature. The symbols referenced for manmade
features are often a guide to the treatment of a structure
shown to scale rather than a standard symbol. At the
beginning of the instructions for the use of each type of
attribute code, general directions for the method of
applying attribute codes to different feature treatments
are given. Any further instructions or explanations
peculiar to a specific attribute code appears with that
code.
3.11.1.1 Manmade Features Attribute Codes
The attribute codes authorized for use on manmade features
are listed in this section. Descriptions of the codes are
in sections 3.11.2 through 3.11.8.
o Node attribute codes
None
o Area attribute codes
000 0000 Outside area
200 0100 Church complex (convent, retreat, and so
on)
200 0101 School campus (university, college, and
so on)
200 0102 Hospital complex (sanatorium, nursing
home, and so on)
200 0103 Orphanage
200 0104 Prison compound
200 0105 Trailer park
200 0120 Ski area
200 0122 Athletic field
200 0123 Golf course
200 0124 Shopping center
200 0125 Zoo
200 0126 Drive-in theater
200 0127 Racetrack or raceway
200 0128 Playground
200 0140 Marina
200 0141 Cable area
200 0150 Built-up area
200 0160 Industrial park
200 0161 Materials storage area
200 0162 Refinery or industrial plant
200 0163 Tailings
200 0164 Intricate surface area
200 0165 Oil sump or sludge pit
200 0180 Tank farm
200 0181 Feedlot
200 0182 Experimental farm
200 0183 Proving grounds
200 0184 Firing range
200 0190 Void area
o Line attribute codes
200 0200 Conveyor
200 0201 Boardwalk
200 0202 Wall
200 0203 Sea wall
200 0206 Fence line
200 0207 Flume (nonwater)
200 0209 Sewer line
200 0211 Coke ovens
200 0212 Recreational slide
200 0213 Screen (drive-in theatre)
200 0214 Drag strip, racetrack, or raceway
200 0215 Athletic track
200 0250 Arbitrary closure line
200 0299 Processing line
o Single-point attribute codes (degenerate line)
200 0300 Grave site
200 0301 Historical marker
200 0302 Mine tunnel entrance or cave
200 0303 Mine shaft
200 0304 Prospect
200 0305 Tower
200 0306 Burner/stack
200 0307 Drilled well
200 0308 Cliff dwelling
200 0309 Light
200 0310 Brick kiln
200 0311 Drill hole
200 0314 Guzzler
200 0315 Located object or landmark object
200 0316 Campsite
200 0317 Wind generator
o General purpose attribute codes (apply to nodes,
areas, lines, or degenerate lines).
200 0400 Building
200 0402 Church
200 0403 School
200 0404 Municipal building
200 0405 Courthouse
200 0406 Post office
200 0407 City or townhall
200 0408 Hospital
200 0409 Prison
200 0410 Town, village, settlement, locality, or
unincorporated village
200 0411 Amphitheater
200 0412 Customs building
200 0420 Cemetery
200 0421 Sewage disposal plant
200 0422 Waterworks
200 0423 Oil reservoir
200 0424 Drilled well field
200 0425 Tank
200 0426 Offshore oil or gas platform
200 0427 Mine dump
200 0428 Open pit mine
200 0429 Quarry
200 0430 Strip mine
200 0431 Landfill
200 0432 Pit, unconsolidated material
200 0433 Radio or television facility
200 0434 Storage bin
200 0435 Levee
200 0436 Spoil bank
200 0438 Reclaimed area
200 0445 Fairgrounds
200 0446 Rodeo grounds
200 0447 Corral
200 0448 Boat ramp
200 0449 Campground
200 0450 Fort
200 0451 Swimming pool
200 0452 Archeological site, ruin, or Indian mound
200 0453 Recreation area, public use area
200 0454 Picnic area
200 0455 Port of entry
200 0456 Stadium
200 0465 Pile, dolphin, stump, or snag
200 0466 Breakwater, jetty, pier, dock, causeway,
or wharf
200 0467 Exposed wreck or wreckage
200 0468 Sunken wreck
200 0469 Drydock
o Descriptive attribute codes
200 0601 Underground
200 0602 Under construction
200 0603 Abandoned
200 0604 Water
200 0605 Oil
200 0606 Gas
200 0607 Chemical
200 0608 Covered
200 0609 Gravel
200 0610 Sand
200 0611 Clay
200 0612 Borrow
200 0613 Radio
200 0614 Lookout
200 0615 Unincorporated
200 0616 No population
200 0617 Submerged
200 0618 Ruin
200 0619 Caliche
200 0620 Chert
200 0621 Cinder
200 0622 Pumice
200 0623 Shale
200 0624 Scoria
o Parameter attribute codes
200 0000 Photorevised features
202 ---- Width in mils of feature to scale
208 0000 Best estimate of position or
classification
209 00-- Coincident feature or symbol
3.11.2 Node Attribute Codes
There are no attribute codes for nodes in this category.
3.11.3 Area Attribute Codes
Area attribute codes identify an area point digitized
within a feature that is greater than 0.030 inch in length
or width as depicted on the map. Area attribute codes do
not identify either the line that outlines the area or the
individual features that appear within the area, such as
buildings within a hospital complex. Individual buildings
within the area are also digitized as appropriate to their
size and class (see section 3.11.6).
The determination of the extent of an area is simple when
the outline is a special symbol, such as symbol 209(A),
which outlines a cemetery as shown in symbols 214 or 215
(A). The outline may also be a symbol in another
category, such as a road that delimits a trailer park.
The determination of the extent of the area is more
difficult if the outline is formed by the omission of
urban or woodland tint, as is done for a school complex,
or formed by the juxtaposition of cleared areas and other
features, as is done for tank farms or ski areas. In such
cases, the placement of the outline must be based on
judgment. The rules for coding the line that delimits an
area are in section 3.11.4.
000 0000 Outside area
This code is described in section 3.3.3.
200 0100 Church complex (convent, retreat, and so on)
This code identifies an area that has a name or
label indicating that it is a church complex.
The area contains buildings shown by symbols
168-170, 172-173 (A); 112.1(B); or 2106.05(D)
(see code 200 0402).
200 0101 School campus (university, college, and so on)
This code identifies an area that has a name or
label indicating that it is a school campus. The
area contains buildings shown by symbols 166,
167, 170-173 (A); 112.1(B); or 2106.04(D) (see
code 200 0403).
200 0102 Hospital complex (sanitarium, nursing home, and
so on)
This code identifies an area that has a name or
label indicating that it is a health care
complex. The area contains individual buildings
(see code 200 0408).
200 0103 Orphanage
This code identifies a large building or complex
that has a name or label indicating that it is an
orphanage or institution housing children. If
shown as a complex, the area contains individual
buildings (see code 200 0400).
200 0104 Prison compound
This code identifies an area that has a name or
label indicating that it is a prison or detention
center. If the area is without a defined
boundary, represented by a group of buildings,
then digitize the area and assign this code. If
the area is clearly defined by military
reservation boundary symbols 207(A), 112.78(B),
512.28(C), or 2107.05(D), the boundary is
collected in the Boundaries category. When the
area contains individual buildings, see codes 200
0409 and 200 0400.
200 0105 Trailer park
This code identifies an area labeled as a trailer
park. The outline of the trailer park may be
formed by a road pattern. If so, do not encode
the outline as being coincident with a
transportation feature. This is because the
digitized outline of the trailer park follows the
road
casing, whereas the road itself has a centerline
digitized, so the two lines are not coincident.
200 0120 Ski area
This code identifies an area determined to be a
ski area by the presence of ski lifts and slopes.
The ski lifts are digitized in the transportation
category. The area contains individual buildings
(see code 200 0400).
200 0122 Athletic field
This code identifies an area that contains one or
several athletic fields that is defined by
symbols 209(A) or 2107.06(D). These may include
and be labeled as running tracks, soccer fields,
football fields, baseball diamonds, and so on,
which are associated with a recreational area or
school system. When the athletic field is
adjacent to a school it is shown by symbol
516.16(C) and is not labeled. Digitize an area
enclosing the track and give it this code. See
code 200 0215 for coding the tracks.
200 0123 Golf course
This code identifies an area, shown by symbol
2111.17(D), that is labeled as a golf course or
country club regardless of size. The outline of
this area is determined according to its
relationship to delimiting features, such as
rivers, railroads, or house omission tint and so
on. Disregard woodland tint that separates the
fairways. The area may contain individual
buildings (see code 200 0400). If it is not
possible to distinguish the outline, then
digitize a degenerate line on the first letter of
the golf course label.
200 0124 Shopping center
This code identifies an area in which a building
or group of buildings is labeled as a shopping
center. The area does not include the parking
areas adjacent to the buildings, if shown, that
are collected with the Roads and Trails overlay.
200 0125 Zoo
This code identifies an area that is labeled as
a zoo, zoological park, or wild animal park.
200 0126 Drive-in theater
This code identifies an area defined by symbols
252(A), 512.68(C), or 2111.08(D). The interior
structures are digitized and coded (see codes 200
0400 and 200 0213).
200 0127 Racetrack or raceway
This code identifies an area labeled as a site of
horse races or motorized vehicle races and
labeled "race track" or "raceway." The area
includes operator areas, stands, infields, pit
areas, and so on. It does not include adjacent
parking areas. This area may include interior
structures such as racetracks and grandstands
shown by symbols 116.9(B), 516.15(C), or
2110.10(D). Significant interior structures are
digitized and coded (see codes 200 0400 and 200
0214).
200 0128 Playground
This code identifies an area labeled
"playground."
200 0140 Marina
This code identifies an area labeled "marina."
This area is located along the shore of a
navigable waterway and may contain a
concentration of dock or pier structures (code
200 0466), boathouses, and other related
buildings (see code 200 0400).
200 0141 Cable area
This code identifies an area delineated by
symbols 245(A), 512.143(C), or 2113.06(D) and
labeled as the site of underwater cable
placement. The area normally is open ended and
requires closing by the use of two arbitrary
closure lines (see code 200 0250).
200 0150 Built-up area
This code has traditionally been applied to
areas delineated by symbols 520(A), 115.1(B),
515.1(C), or 2110.11(D), but the minimum
allowable size, density criteria, and
exclusions for built-up area have been
revised. As a result, there may be areas on
the graphic that did not meet the previous
criteria for built-up area, but do meet the
revised criteria. These areas will be
collected as built-up area.
Built-up area is defined as an area of
intensive use, with much of the land covered
by structures. The limits of the built-up
area are determined by the relative
concentration of buildings and associated
intensive use areas, such as parking lots, and
the existence of a systematic street pattern.
Density of building and associated use areas
will vary from densely concentrated areas
downtown, to moderately concentrated
residential areas where most of the property
is developed. Built-up area is collected if
the area is at least 30% built-up and is at
least 40 acres in size, and has a minimum
width of 660 feet.
Built-up area does not refer to political
boundaries and may include incorporated and
unincorporated areas as well as military
reservations.
Although built-up area limits need not be
fixed in relation to linear features, where
practical, the limits of built-up area should
share the edge with other linear features such
as streams, boundaries, roads, railroads, etc.
The outline of built-up area should be
relatively smooth. It should not be extended
to include a few buildings nor to exclude a
few buildings when the smoothness of the edge
would be effected. When the perimeter streets
are at least 30% developed, the built-up area
should be extended across the street to
include these buildings.
Housing developments where the street network
is complete and building development is well
underway, and it can be anticipated that most
of the development will be occupied, should be
collected as built-up area.
Narrow strips where there is only a road and
buildings along both sides of the road should
not be collected as built-up area, even if
they would connect an adjoining larger built-
up areas. A large built-up area that is
separated from a smaller isolated built-up
area may be extended to include the smaller
area, if the smaller area is within 660 feet
of the larger built-up area.
Within a built-up area, areas which are less
than 30% developed, and are at least 80 acres
in size, with a minimum width of 660 feet, are
not collected as built-up. In addition, if
canal/ditches, lake/ponds, reservoirs,
stream/rivers, swamp/marshes, parks, railway
yards, runways, air facilities, cemeteries,
golf courses, or exhibition grounds
(fairgrounds) are collected as areas within a
built-up area they are not also collected as
built-up. All other area features collected
within a built-up area are also collected as
built-up areas.
See section 3.11.6 for information on which
buildings are collected within built-up areas.
200 0160 Industrial park
See code 200 0162.
200 0161 Materials storage area
See code 200 0162.
200 0162 Refinery or industrial plant
This code and codes 200 0160 and 200 0161
identify areas labeled to indicate a particular
industrial feature. On 1:24,000-scale source,
the area may contain buildings (see code 200
0400). Do not use these codes for tank farms or
oil and gas fields.
200 0163 Tailings
This code identifies an area of tailings shown by
symbols 324(A), 135.3(B), 535.4(C), or 2112.05(D)
and labeled. Tailings are the discarded material
from ore processing or dredge operations piled in
irregular heaps and labeled "tailings" or "dredge
tailings."
200 0164 Intricate surface area
This code describes an area shown by symbol
328(A). This type of area may be labeled as a
disturbed surface. Do not use this code if the
area is labeled "strip mine" (see code 200 0430)
or "Lava" (see code 080 0104). This feature may
be added through photorevision and shown in
purple (see code 200 0000).
200 0165 Oil sump or sludge pit
This code identifies an area shown by symbols
250(A), 512.86(C), or 2111.07(D) and labeled.
200 0180 Tank farm
This code identifies an area labeled "tank farm"
that encompasses a group of tanks. The tanks in
the interior of the area are digitized (see code
200 0425). The tank farm outline, if not clearly
demarcated, is obtained by digitizing a line
around the outermost tanks.
200 0181 Feedlot
This code identifies an enclosed area labeled
"feedlot," shown by symbol 2111.14(D). The area
may contain individual buildings (see code 200
0400).
200 0182 Experimental farm
This code identifies an area labeled to indicate
that it is an experimental farm or agricultural
research facility. If the area contains
individual buildings, see code 200 0400.
200 0183 Proving grounds
This code identifies an area labeled or named to
indicate that it is a proving ground or testing
area. The area may contain individual buildings
(see code 200 0400). The outline of the area may
be coincident with a military reservation
boundary (209 0009).
200 0184 Firing range
This code identifies an area labeled or named to
indicate that it is a firing range, artillery
range, or detonation area. The area may contain
individual buildings (see code 200 0400). The
outline of the area may be coincident with a
military reservation boundary (209 0009).
200 0190 Void area
This code identifies an area on the source
material where no manmade feature data exist
because of replacement by imagery or a pattern
from another category. A void area is also found
beyond the national boundary to distinguish it
from the background area. Where appropriate, the
perimeter of the void area, usually a closure
line, is coded as coincident with the category
that defines the manmade feature void area. The
closure line that defines the void area beyond
the national boundary is coded as coincident with
the Boundaries category (209 0009).
3.11.4 Line Attribute Codes
Each line attribute code identifies a line segment
digitized along a linear feature. The feature may be
digitized in segments as it intersects other features or
changes in some way, such as a portion of a levee
coincident with a boundary. If the linear feature is
represented by a dashed line, the digitized line does not
replicate the dashes but is a solid line.
For this overlay the line that forms the outline of an
area has no assigned attribute code unless:
o it is coincident with a linear feature in another
category such as a boundary;
o the outline is so difficult to determine that it
warrants the use of parameter code 208 0000 to
indicate the uncertainty of position;
o it has been arbitrarily placed to close off a
labeled or named area that is not otherwise
symbolized, or to complete the closure of a feature
partially outlined by a line existing on the source
(code 200 0250); or
o it is a linear feature in itself, distinct from the
area it outlines.
200 0200 Conveyor
This code identifies a line labeled "conveyor" or
"conveyor belt" and represented by a dashed line
on the 1:24,000-scale maps. The dash length and
lineweight varies among map sheets. The label
might have been omitted on a photorevised
conveyor, in which case the conveyor may still be
identifiable if it connects a mine or strip mine
to a type of plant.
200 0201 Boardwalk
This code identifies a centerline digitized in a
boardwalk shown by symbols 254(A), 512.71(C), or
2111.09(D) and labeled "boardwalk." If shown to
scale (greater than 0.020 inch), also use code
202 0--- to encode the width.
200 0202 Wall
This code identifies a line that represents a
wall as shown by symbols 192, 193 (A); 512.63,
512.64 (C); or 2110.06, 2110.06 (D) and labeled.
If the wall is shown to scale (0.017 inch or
greater), digitize a centerline and also use code
202 0--- to encode the width. This code is also
used for miscellaneous wall structures, such as
stabilizing walls, that are depicted on the
graphic source but unlabeled.
200 0203 Sea wall
This code identifies a line shown by symbols
159(A), 112.69(B), 512.48(C), or 2108.07(D) and
labeled. A sea wall is usually coincident with
the shoreline (see code 209 0005).
200 0206 Fence line
This code identifies a line shown by symbols
522(A), 523.15(C), or 2110.07(D).
200 0207 Flume (nonwater)
This code identifies a line shown by symbol
191(A) or 2110.04(D) and labeled. An appropriate
descriptive code is also used to describe the
substance being carried by the flume, for
example, 200 0605 for oil flume. Water flumes
are digitized as part of the hydrography data
category.
200 0209 Sewer line
This code identifies a line shown by symbols
116.13(B) or 516.24(C). Because the feature is
submerged, also use code 200 0617.
200 0211 Coke ovens
This code identifies a centerline digitized along
symbols 253(A) or 512.70(C).
200 0212 Recreational slide
This code identifies a line shown by symbols
188(A), 112.59(B), 512.117(C), or 2110.09(D). A
recreational slide is shown on newer maps when it
is a permanent installation.
200 0213 Screen (drive-in theater)
This code identifies the line within the drive-in
theater, shown by symbols 252(A), 512.68(C), or
2111.08(D) that represents the screen.
200 0214 Drag strip, racetrack, or raceway
This code identifies a racetrack or raceway shown
by symbols 116.9(B), 516.15(C), or 2110.08(D) and
labeled. See code 200 0127 to code the
surrounding area. This code also identifies a
drag strip that is usually shown by a straight
segment of road and labeled.
200 0215 Athletic track
This code identifies a feature shown by symbol
516.16(C) that is used for track and field
athletic events. The track is not named or
labeled when it is shown adjacent to a school or
other facility. See code 200 0122 to code the
surrounding area.
200 0250 Arbitrary closure line
This code identifies a line digitized to close
off an area that is partially outlined by a line
existing on the source. For example, a drive-in
theater may have a portion of the normal symbol
outline overprinted by another feature. This
code is used on the line digitized to close off
the open end. This code also identifies a line
digitized to close off a labeled or named area
that is not otherwise symbolized on the existing
source, e.g., town, village, and so on. This
code is used on the line digitized to delimit the
area. Also use the primary code when
appropriate.
200 0299 Processing line
Some routines in the processing system (PROSYS)
have limitations on the number of lines, nodes,
and areas that can be processed. For example, an
area may be associated with no more than 4,751
lines. This code describes a line or lines
digitized to segment the data within a file to
create more background areas, thereby enabling
large files to be processed.
3.11.5 Single-Point Attribute Codes (degenerate lines)
A single-point attribute code identifies a degenerate line
digitized on a standard USGS symbol. The features
identified by these codes are of a size that are
represented by a point symbol rather than shown to scale.
Unless otherwise specified, the degenerate line is placed
in the center of the symbol being digitized.
200 0300 Grave site
This code identifies the location of one or two
graves shown by a cross and labeled "grave" as in
symbols 213(A), 512.119(C), or 2107.07(D). The
degenerate line is digitized at the intersection
of the cross. It differs from cemetery
symbolization by having no boundary. See code
200 0420 for larger cemeteries.
200 0301 Historical marker
This code identifies a feature shown by symbols
198(A) or 2111.03(D) (located object) or 112.4(B)
(landmark object) and named or labeled. These
symbols are used for other landmark features so
the label is the distinguishing feature.
200 0302 Mine tunnel entrance or cave
This code identifies a feature shown by symbols
184(A), 112.35(B), 512.80(C), or 2109.03(D). The
degenerate line is digitized at the intersection
of the arms of the symbol.
200 0303 Mine shaft
This code identifies a feature shown by symbols
186(A), 112.36(B), 512.81(C), or 2109.05(D).
200 0304 Prospect
The code identifies a prospect shown by symbols
185(A), 512.82(C), or 2109.04(D). A prospect is
an excavation for the purpose of mineral
exploration that is smaller than a mine tunnel or
shaft. A degenerate line is digitized on the
intersection of the arms of the symbol.
200 0305 Tower
This code identifies a feature shown by symbols
198(A), 112.4(B), or 2111.03(D). These symbols
are used for other landmark features, so the
label is the distinguishing feature. If the
label specifies the type of tower (radio or
lookout) also use the appropriate descriptive
code (200 0613 or 200 0614).
200 0306 Burner/stack
This code identifies a feature shown by symbols
198(A) or 2111.03(D), which is labeled as a
burner or stack. The symbol is used for other
landmark features so the label is the
distinguishing feature.
200 0307 Drilled well
This code identifies a feature shown by symbols
194(A), 112.101(B), 512.83(C), or 2111.01(D) and
labeled as an oil or gas well. Also use codes
200 0605 (oil) or 200 0606 (gas) to specify the
type of well. Only offshore wells are symbolized
on 1:100,000-scale sources and are shown as
platforms (see code 200 0426). This code does
not apply to water wells, which are digitized in
the hydrography category.
200 0308 Cliff dwelling
This code identifies a feature shown by symbols
182(A), 112.34(B), 512.79(C), or 2106.10(D) and
named or labeled.
200 0309 Light
This code identifies a feature shown by symbols
198(A), 112.102(B), 512.163(C), or 2111.15(D) and
labeled "Light."
200 0310 Brick kiln
This code identifies a feature shown by a circle
0.030 inches in diameter that is labeled "brick
kiln."
200 0311 Drill hole
This code identifies a feature shown by symbols
198(A), 112.101(B), or 2111.03(D) and labeled
"drill hole."
200 0314 Guzzler
This code identifies a feature shown by symbols
198(A), or 2111.03(D) and labeled "guzzler."
200 0315 Located object or landmark object
This code identifies a feature shown by symbols
198(A), 112.4(B), 512.72(C), or 2111.03(D) and
NOT labeled.
200 0316 Campsite
This code identifies a feature shown by symbol
512.72(C) and labeled.
200 0317 Wind generator
This code identifies a feature shown by the
windmill symbol 199(A), 112.3(B), 512.69(C), or
2111.04(D), and labeled "wind generator."
3.11.6 General Purpose Attribute Codes
A building shown by a minimum size symbol, or a building
less than 100 feet along the longest axis, is collected
as a single-point feature (degenerate line). A building
that is 100 feet or more along the longest axis is
collected as an area. The outline of the area is treated
in accordance with the directions given in the
introduction of section 3.11.3.
Within a built-up area (200 0150), collect only buildings
that are at least 400,000 square feet, or can be
described as an arena, auditorium, armory, capitol, city
hall (200 0406), community center, courthouse (200 0405),
firehouse (200 0404), hospital (200 0408), house of
worship (200 0402), library, medical center (200 0408),
memorial, museum, post office (200 0406), railroad
station, school (200 0403), stadium, or town hall (200
0407). Note that specific codes do not exist for all of
these building types; in these cases the building code
(200 0400) is used. Also note that railroad station is
collected in the Pipelines, Transmission Lines, and
Miscellaneous Transportation Features category.
Outside built-up area, collect all buildings according to
codes that follow.
A building that is shown with a purple photorevised
addition is digitized as two separate buildings.
The original portion of the structure is identified
with the appropriate codes. The purple portion is
identified by the same codes and is, in addition,
assigned code 200 0000 (photorevised feature).
200 0400 Building
This code is used for all buildings that were
previously attributed as class 1 or class 2. All
buildings shown by symbols 163, 164, 165 (A);
112.1(B); 512.52, 512.53 (C); or 2106.01 through
2106.03 (D); and buildings shown by old
symbols 175, 176 (A) or 512.57, 512.58 (C) are
given this attribute code. This code is not used
on buildings that have a specific code, such as
church or hospital. It is used, however, on
buildings that in themselves have no other
specific code but are located within a coded
area. One example is a building within a prison
compound (see code 200 0409).
200 0402 Church
This code identifies a building shown by symbols
168-170, 172 (A), 512.55(C), or 2106.05(D). This
code is also used on buildings shown by these
symbols that are located within an area coded as
a church complex (see code 200 0100).
200 0403 School
This code identifies a building shown by symbols
166-167, 170-173 (A); 512.54, 512.56 (C); or
2106.04(D). This code is also used on buildings
shown by these symbols that are located within an
area coded as a school complex (see code 200
0101).
200 0404 Municipal building
This code identifies a government building shown
within an urban area by the building symbol,
other than a courthouse, post office, city, or
townhall. Examples of municipal buildings are
fire stations, police stations, or city animal
pounds.
200 0405 Courthouse
This code identifies a building labeled as a
courthouse, regardless of jurisdiction.
200 0406 Post office
This code identifies a building labeled as a post
office.
200 0407 City or townhall
This code identifies a building labeled as a city
or townhall.
200 0408 Hospital
This code identifies a building labeled as a
hospital. The code is used on all buildings
within an area coded as a hospital complex (200
0102).
200 0409 Prison
This code identifies a building labeled as a
prison. The code is used on the largest
buildings within an area labeled as a prison
compound. All other buildings are coded 200
0400.
200 0410 Town, village, settlement, locality, or
unincorporated
village
This code identifies a location designated, by a
label or name, as a site of habitation by groups
of humans. The localities that have a definite
symbolized boundary are represented in the
Boundaries category. This code is intended to
identify unincorporated villages that on the
1:24,000-scale sources have no boundaries shown,
as well as towns, villages, and settlements that
on the 1:100,000-scale sources are represented by
a dot, street pattern, or road intersection.
When groups of buildings or street patterns
represent the locality, digitize a line depicting
the limits of the area, which includes the name
or label and related buildings and streets (see
code 200 0250). When the symbol 112.42(B)
represents the locality, digitize a degenerate
line on the dot and identify it with this code.
If the locality is shown by a road intersection,
digitize a degenerate line at the intersection
and identify it with this code. If a locality is
named for a point feature appearing on the map,
and there are no other features, e.g., buildings,
digitize a degenerate line on the symbol.
However, if the symbol does not appear on the
map, then digitize a degenerate line near the
name. In addition, if the locality is labeled as
unincorporated, also use code 200 0615; if
unpopulated, use code 200 0616.
200 0411 Amphitheater
This code identifies a structure generally
symbolized by a 0.003-inch solid outline that is
compiled to scale and labeled.
200 0412 Customs building
This code identifies a building shown by symbols
163, 165 (A); 112.1(B); 512.52, 512.53 (C); or
2106.01 through 2106.03 (D) and labeled.
200 0420 Cemetery
This code describes a burial site of more than
two graves with a delineated boundary that is
shown by symbols 213, 214, 215 (A); 112.72,
112.73 (B); 512.120, 512.121 (C); or 2107.07,
2107.08 (D). If the symbol is 0.030 inch or less
on the longest side, digitize a degenerate line
on the symbol and identify it with this code. If
the symbol size is greater than 0.030 inch on the
longest side, then digitize the cemetery as an
area. Because the outline of national cemeteries
is shown by boundary symbols 202(A), 112.74(B),
512.123(C), or 2107.01 (D), also assign the
coincident feature code 209 0009 to the outline
of a national cemetery.
200 0421 Sewage disposal plant
This code identifies the prominent building
associated with a labeled sewage disposal
facility. The sewage disposal ponds and
filtration beds are digitized in the Hydrography
category.
200 0422 Waterworks
This code identifies the prominent building
associated with a labeled waterworks or water
treatment plant. Any reservoirs or ponds are
digitized in the Hydrography category.
200 0423 Oil reservoir
This code identifies a feature shown by symbols
251(A) or 512.87(C). If the symbol diameter is
0.030 inch or less, digitize a degenerate line in
the center of the symbol. If the diameter is
greater than 0.030 inch, digitize the feature as
an area.
200 0424 Drilled well field
This code identifies an area of drilled oil or
gas wells. It is labeled "oil field" or "gas
field," or "oil and gas field." On
1:24,000-scale maps it contains numerous wells as
shown by symbols 194(A), 512.83(C), or
2111.01(D). On 1:100,000-scale maps the name or
label is shown in the location. When it is
possible to determine the extent of the oil or
gas field, digitize it as an area. If the extent
cannot be determined, or if the source is a
1:100,000-scale map that only has a label, then
digitize a degenerate line on the first letter of
the label. Also use the appropriate descriptive
code to specify oil or gas or both (see codes 200
0605 and 200 0606).
200 0425 Tank
This code describes tanks shown by symbols
196(A), 112.2(B), 512.65(C), or 2111.02(D); or
shown by old symbols 197(A) or 512.66(C). Any
tank 0.030 inch or less in diameter is digitized
as a degenerate line. Any tank greater than
0.030 inch in diameter is digitized as an area.
Also use the appropriate descriptive code to
specify the contents (see codes 200 0604 through
200 0607).
200 0426 Oil or gas platform
This code describes an offshore oil or gas
platform shown by symbols 116.11(B) or 516.22(C).
It is labeled "oil platform," "gas platform," or
"oil and gas platform." If
the square is 0.030 inches or less, digitize a
degenerate line on the symbol. If the symbol is
greater than 0.030 inches, digitize it as an
area. Also use the appropriate descriptive code
to specify oil or gas, or both (see codes 200
0605 and 200 0606).
200 0427 Mine dump
This code identifies a mine dump, which is a pile
of waste rock, from a mine. It is shown by a
variety of treatments all of which are labeled
"mine dump."
When the mine dump is shown by symbols 327(A) or
532.23(C) digitize a centerline in the symbol
from one end to the other, at right angles to the
tick marks. When the mine dump is large and has
a regular hill-like shape, it may be shown by
contours only, and is digitized as an area.
Outline the area, but do not digitize the
contours. This applies to 1:24,000-scale maps.
A large mine dump of an irregular shape covering
a large area that may not be evident from the
contours is overprinted with the intricate
surface pattern as shown by symbols 328(A) or
535.4(C). Digitize an area outlined by the edge
of the pattern. This applies to 1:24,000-scale
maps.
On Provisional Edition Maps all mine dumps are
shown by symbol 2112.05(D) and labeled.
On 1:100,000-scale maps all mine dumps are shown
by symbol 135.3(B). This symbol is digitized as
an area and is distinguished from other disturbed
surfaces only by the label.
200 0428 Open pit mine
This code describes an open pit mine, which may
be shown by a variety of treatments all of which
are labeled "open pit mine." When the open pit
mine is shown only by the crossed-pick symbols
183(A), 112.37(B), 512.84(C), or 2109.01(D)
(without tint), digitize a degenerate line at the
intersection of the symbol. When an open pit
mine is shown by symbols 333(A), 535.3(C), or
2112.08(D) digitize as an area. The outline of
the area is formed by digitizing a centerline
through the brown hachures of symbol 333(A) or
along the edge of the brown tint of symbol
512.84(C). This applies to 1:24,000-scale maps.
On 1:24,000-scale maps, there are large open pit
mines that are shown entirely by contouring and
a label. These may have structures, water
bodies, roads, and railroads inside the pit.
This feature treatment is digitized as an area.
The outline of the area is the outermost contour
line of the pit.
On Provisional Edition Maps all open pit mines
are shown by symbol 2112.08(D) and labeled.
On 1:100,000-scale maps, large open pit mines are
shown by symbol 135.2(B) and labeled. This
symbol is digitized as an area by following the
edge of the pattern.
200 0429 Quarry
A quarry is an open pit from which rock or stone
is excavated. It is shown by the same symbology
as the open pit mine but is labeled "quarry."
The feature is digitized in the same manner as
described in the instructions for code 200 0428.
200 0430 Strip mine
A strip mine is a shallow surface excavation that
may be digitized in one of two ways, which
depends on the symbolization shown on the source.
When a linear strip mine is shown by a narrow
strip of disturbed surface, 0.030 inch or less in
width, between two contour lines as shown in
symbols 326(A), 535.2(C), or 2112.06(D) digitize
centerline of the pattern.
If the strip of disturbed surface is greater than
0.030 inch, digitize it as an area. Digitize the
contour line as the outline of the strip mine.
When the strip mine is shown by symbols 325(A),
135.1(B), 535.1(C), or 2112.06(D) digitize an
area. The outline of the area is the edge of the
disturbed surface pattern or tint.
200 0431 Landfill
This code describes a feature shown by the symbol
328(A) that is labeled "landfill." If the area
of the landfill is 0.030 inch or less in
diameter, digitize it as a degenerate line. If
the area is greater than 0.030 inches in
diameter, digitize the area. The outline of the
area is the edge of the disturbed surface
pattern.
200 0432 Pit, unconsolidated material
A pit is an excavation of unconsolidated
materials such as sand, gravel, or clay. It is
also called a borrow pit when earth was removed
for construction purposes. It is shown by
symbols 333(A), 112.38, 135.4 (B), 535.5(C), or
2112.08(D) with a crossed shovel instead of a
crossed pick. When the pit is shown by symbols
255(A), 112.38(B), 512.85(C), or 2109.02(D)
without the brown tint, then
digitize a degenerate line at the intersection of
the crossed shovels.
When the pit is shown by symbols 333(A),
112.38(B), 512.85(C), or 2112.08(D) with tint,
digitize it as an area. Digitize a centerline
through the brown hachures of symbol 333(A) or a
line along the edge of the brown tint pattern of
symbols 112.38(B) or 512.85(C).
For all cases, also use the appropriate
descriptive code to describe the specific type of
pit.
200 0433 Radio or television facility
This code identifies a feature labeled as a radio
facility. The facility may be one or more
buildings. Digitize the buildings according to
the instructions for code 200 0400 and identify
each with this code. Do not use this code for a
radio tower (see code 200 0305).
200 0434 Storage bin
Storage bins may be symbolized as tanks or as
buildings, but with the label "storage bin" or
"silo." Digitize the storage bin according to
the instructions for code 200 0425 or 200 0400,
as appropriate, and identify with this code.
200 0435 Levee, dike
This code identifies a line shown by symbols 314
through 315(A); 132.13(B); 532.9, 532.11, 532.12
(C); or 2112.01, 2112.02 (D) or an area shown by
contours that may or may not be labeled. When
the linear symbols are used, digitize a line and
identify it with this code. When shown by
contours, digitize an area and identify it with
this code. The perimeter of an areal feature are
digitized as an arbitrary closure line (200 0250)
because the limit is not explicitly symbolized.
When the levee is shown by symbols 315(A),
532.12(C) or 2112.02(D), the centerline is
digitized along the road or railroad and is also
coded with feature codes 209 0017 or 209 0018 to
indicate coincidence. On the 1:100,000-scale
sources a levee carrying a road or railroad is
not shown; instead the road or railroad is
labeled "road on levee" or "railroad on levee."
For these cases digitize the centerline of the
road or the railroad and also use the coincident
feature codes 209 0017 or 209 0018.
200 0436 Spoil bank
This code identifies a feature generally shown by
symbols 332(A), 532.13(C), or 2112.01(D). A
spoil bank is a linear accumulation of dredged
material commonly associated with a ditch or
dredge tailings. The digitized line is not
broken where the spaces in the symbol occur. A
large spoil bank may be shown by contours and
labeled. This is digitized as an area.
200 0438 Reclaimed area
This code describes an area, bounded by dashed
purple lines, which contains contours overprinted
with symbol 328(A) and labeled "reclaimed area."
If the area is not labeled, a note is added to
the legend of the map that identifies the area as
"reclaimed mining." This code also identifies an
area represented by a 4% purple tint and labeled
"reclaimed strip mine." Digitize an
unattributed solid line by following the dashed
outline or edge of the pattern and assign this
code to the area.
200 0445 Fairgrounds
This code describes a feature that is labeled as
fairgrounds or parade grounds, whether State,
county, or local. The fairgrounds is digitized
as an area if the outline can be determined. If
it is not possible to distinguish the outline,
then digitize a degenerate line on the first
letter of the fairgrounds label.
200 0446 Rodeo grounds
This code describes a feature that is labeled as
rodeo grounds. It is digitized as an area if the
outline can be determined. If it is not possible
to distinguish the outline, then digitize a
degenerate line on the first letter of the rodeo
grounds label.
200 0447 Corral
A corral is a fenced animal enclosure shown by
symbols 258(A) or 112.44(B). When shown by
symbol 258, digitize the feature as an area.
When shown by symbol 112.44, digitize the feature
as a degenerate line.
200 0448 Boat ramp
A boat ramp is shown to scale in all cases. It
may be any shape and size and, therefore, is
digitized according to the following general
instructions. A boat ramp shown by a symbol of
0.030 inch or less on the longest side is
digitized as a degenerate line. A boat ramp
shown by a single line as in symbol
516.14(C) is digitized as
a line. A boat ramp shown by a symbol greater
than 0.030 inch on the longest side is digitized
as an area.
200 0449 Campground
This code identifies a feature shown by symbols
257(A), 112.48(B), 512.115, or 2111.11(D) and
labeled. If the outline of a campground can be
determined, digitize it as an area. If the
outline cannot be determined, digitize a
degenerate line in the center of the base of the
tepee symbol.
200 0450 Fort
A fort is a building or complex named or labeled
to indicate that it is a fort. If the fort is
without a defined boundary, represented by a
group of buildings, and the outline can be
inferred, it is digitized as an area and assigned
this code. If the fort is a clearly defined
complex, with a military reservation boundary
shown by symbols 207(A), 112.78(B), 512.128(C),
or 2107.06(D) defining the area, the area and
boundary are collected in the Boundaries
category. Digitize any interior structures as
appropriate for their class. If the fort is
shown as an individual building, follow the
general instructions for the digitizing of
structures and give the feature this code.
Historic forts may be shown by the located object
symbols, 198(A), 112.4(B), or 2111.03(D). In
this case, digitize a degenerate line on the
symbol.
200 0451 Swimming pool
This code identifies a feature shown by symbols
179(A), 512.60, 545.4 (C), or 2205.01(D); labeled
"swimming pool" on earlier map editions. On
later editions, this symbol is not labeled but
bears a resemblance to a reservoir. If the
symbol is 0.030 inch or less on the longest side,
digitize
a degenerate line on the center of the symbol.
If the symbol is greater than 0.030 inch on the
longest side, digitize it as an area. If this
symbol is not labeled, also use code 208 0000
(best estimate).
200 0452 Archeological site, ruin, or Indian mound
This code describes a structure of historical
significance, protected by Federal or State
agencies, shown by symbols 181(A), 112.33(B),
512.78(C), or 2106.09(D). If the symbol is 0.030
inch or less on a side, digitize a degenerate
line in the center of the symbol. If the symbol
is greater than 0.030 inch on a side, digitize it
as an area. Note that the outline of the symbol
is solid rather than dashed if the symbol is less
than 0.050 by 0.050 inch in size (both in
reference A and reference B). This code also
describes an Indian mound that is shown by
contours and a name or label. An unattributed
line is digitized to define the perimeter of the
area, by following the contour shown as the base
of the mound. If the area defined is 0.030 inch
or less in diameter, digitize a degenerate line
inside the contour shown as the top of the mound.
200 0453 Recreation area, public use area
This code identifies a feature labeled as a
recreation or public use area, other than
National or State areas that are identified in
the Boundaries category (section 3.8). This
includes roadside parks and viewpoints, vantage
points, and overlooks.
If the outline of the recreation area can be
determined, digitize it as an area. Digitize any
structures within the area as appropriate. If
the outline of the area cannot be
determined, digitize a degenerate line on the
first letter of the name or label that identifies
the recreation area.
200 0454 Picnic area
This code identifies a feature shown by symbols
256(A), 112.47(B), 512.116(C), or 2111.10(D). If
the outline of the picnic area can be determined,
digitize the feature as an area. If the outline
cannot be determined, digitize a degenerate line
on the center of the picnic table symbols.
200 0455 Port of entry
A port of entry is a building located at a point
of entry on the national boundary, shown by
symbol 112.43(B). Digitize the structure
according to the instructions for buildings (see
code 200 0400).
200 0456 Stadium
This code identifies a sports stadium that is not
associated with a school. The classification
does not include parking lots or other structures
adjacent to the stadium. Digitize stadiums shown
by symbol 112.8(B) to scale and apply this code
to the area. No symbol is shown for a stadium in
reference A, rather the structure is shown as a
building and labeled. In such cases digitize the
building as an area and give it this code.
200 0465 Pile, dolphin, stump, or snag
This code identifies a feature shown by symbol
235(A). When the feature is shown by the single
circle, digitize a degenerate line in the circle.
When the feature is shown by the circle of dots,
digitize it as an area. Digitize a line on the
circle of dots to form an outline. The
feature may also be shown by a dashed line and
labeled "Pilings," in which case it is digitized
as a line.
200 0466 Breakwater, jetty, pier, dock, causeway, or wharf
This code identifies features shown by symbols
156-158 (A); 112.69, 112.70, 112.96 (B); 512.43
through 512.45, 512.162 (C); or 2108.05, 2108.06
(D). When the feature is shown by a line as in
symbols 156(A), 112.69(B), or 512.43(C), it is
digitized as a line. When shown by symbols
112.70(B), or 512.46, 512.47 (C) also use this
code to indicate that it is a ruined structure
(see code 200 0618). When shown by symbols
157(A) or 512.44(C), digitize it as an area. Use
an arbitrary closure line (see code 200 0250) to
close the landward end of the symbol. When shown
by symbols 158(A) or 512.45(C), also use this
code to indicate that the feature is covered (see
code 200 0608). When shown by symbol 512.162(C),
also use this code to indicate that the feature
is submerged (see code 200 0617).
200 0467 Exposed wreck or wreckage
This code identifies a feature shown by symbols
239, 240 (A); 512.139, 512.140 (C); or
2113.05(D). When shown by symbol 239 digitize a
degenerate line on the center of the ship. When
shown by symbol 240, digitize the feature as an
area. Digitize the line of dots as the outline
of the area.
200 0468 Sunken wreck
This code identifies a feature shown by symbols
241, 242 (A), or 512.141(C). When shown by
symbol 242(A), digitize the feature by placing a
degenerate line on the center of the symbol.
When the masts are exposed on a sunken wreck as
shown by symbols 241(A) or 512.141(C), digitize
the feature as an area. Place the area point on
the center of
the symbol. Digitize a line on the circle of
dots for the outline of the area.
200 0469 Drydock
This code identifies a feature shown by symbols
162(A), 112.68(B), and 512.49(C). These symbols
are in two pieces, the manmade shoreline
enclosing the water area and the tick-marked gate
that is placed in the opening of the drydock.
The shoreline is digitized as a line identified
by the coincident feature code 209 0005. Place
a degenerate line on the point of the V-shaped
tick mark. Use this code on both parts of the
feature.
3.11.7 Descriptive Attribute Codes
Descriptive attribute codes are used to add to or qualify
the meaning of another attribute code. A descriptive
attribute code is only used with another code: node, line,
area, single-point, or general purpose. The use of a
descriptive attribute code is, in many cases, called for
by the equivalent label on the source. For example, a map
may show "sand pits," "gravel pits," "clay pits," or
borrow pits." In each case the identifying code for pits
(200 0432) must be used with the code to describe the type
of pit added; gravel (200 0609), sand (200 0610), clay
(200 0611), or borrow (200 0612).
200 0601 Underground
This code describes a feature that is labeled
"underground." Do not use it to describe a
feature that by definition is always underground,
such as a mine shaft.
200 0602 Under construction
This code describes any feature that is labeled
"under construction."
200 0603 Abandoned
This code describes any feature labeled
"abandoned."
200 0604 Water
This code describes a feature that is labeled
"water."
200 0605 Oil
This code describes a feature that is labeled
"oil."
200 0606 Gas
This code describes a feature that is labeled
"gas."
200 0607 Chemical
This code describes a feature that is labeled
"chemical."
200 0608 Covered
This code describes a pier or wharf that is
covered and is shown by symbol 158(A). It is
used with code 200 0466.
200 0609 Gravel
This code describes a pit labeled "gravel." It
is used with code 200 0432.
200 0610 Sand
This code describes a pit labeled "sand." It is
used with code 200 0432.
200 0611 Clay
This code describes a pit labeled "clay." It is
used with code 200 0432.
200 0612 Borrow
This code describes a pit labeled "borrow." It
is used with code 200 0432.
200 0613 Radio
This code describes a tower labeled "radio." It
is used with code 200 0305.
200 0614 Lookout
This code describes a tower labeled "lookout."
It is used with code 200 0305.
200 0615 Unincorporated
This code describes a locality labeled
"unincorporated." It is used with code 200 0410.
200 0616 No population
This code describes a locality labeled
"unpopulated" or "no population." It is used
with code 200 0410.
200 0617 Submerged
This code describes any feature labeled
"submerged" such as a sewer line (200 0209). Do
not use this code on a feature that by definition
is underwater, such as a sunken wreck.
200 0618 Ruin
This code describes a feature that has the word
added to its label, such as the pier or wharf
ruin shown by symbol 112.70(B). Do not use this
code on ruins described in instructions for code
200 0452. This code is intended for features
that are not of the archeological type but are in
such a state of decay that they are no longer
used for their original purpose.
200 0619 Caliche
This code describes a pit labeled "caliche." It
is used with code 200 0432.
200 0620 Chert
This code describes a pit labeled "chert." It is
used with code 200 0432.
200 0621 Cinder
This code describes a pit labeled "cinder." It
is used with code 200 0432.
200 0622 Pumice
This code describes a pit labeled "pumice." It
is used with code 200 0432.
200 0623 Shale
This code describes a pit labeled "shale." It is
used with code 200 0432.
200 0624 Scoria
This code describes a pit labeled "scoria." It
is used with code 200 0432.
3.11.8 Parameter Attribute Codes
200 0000 Photorevised feature
This code is described in section 3.3.3.
202 0--- Width in mils of feature to scale
Enter the width in mils, of a linear feature that
is shown to scale, in the spaces flush right.
208 0000 Best estimate of position or classification
This code is described in section 3.3.3.
209 00-- Coincident feature
This code is described in section 3.3.3.