USGS Digital Line Graph Boundary Files

For information on how to use Help, press F1 or choose Using Help from the Help menu.

Import Options

The Nodes, Areas and Lines groups of checkboxes control how the Import Filter handles the Node, Area and Line entries in the DLG (Digital Line Graph) file.

Nodes

Areas

Lines

The Selection Criteria edit boxes allow you to specify a value (like 140) or range of values (like 6001-6009 inclusive) which limit the items considered. Leave an edit box empty to place no limit.

ID Number

Major Attribute

Minor Attribute

The Projection radio buttons control how coordinates are returned to the application. DLG "optional" format files (*.LGO) have coordinates calculated using an Albers Equal Area Ellipsoid projection.

Albers

Lat/Long

None

DLG files typically have many vertices in each line segment, often more than are needed for many tasks. The DLG Import Filter provides two methods for reducing the number of vertices.

Automatically

Use Deviation Angle

USGS DLG files have no text ID items associated with Nodes, Areas or Lines. The line segments that make up the Pecos River, for example, are stored as free-standing line segments with river attribute codes, but there is no way to distinguish those line segments from any other line segments with river attributes. Sometimes, it is useful for investigation purposes to know the numeric ID of imported items. When the Synthesize IDs box is checked, the Import Filter synthesizes a Primary ID for each item using the item's type and numeric ID value. (Examples are "N14" for Node 14, "A237" for Area 237 and "L1067" for Line 1067.)

The Defaults button resets the Import Options to default values. The default options direct the DLG Import Filter as follows: ignore all Nodes, consider all Areas (selected areas are returned as polygons), consider free-standing lines, place no limiting selection criteria, use Albers projection and do not synthesize text IDs.

General

File Description

General Messages

Macro Script Options


DLG File Description

The United States Geological Survey (USGS) provides digitized base map data in "line graph" form.  It is available in two formats ("standard" and "optional") on either 9-track magnetic tape or CD-ROM.  The CD-ROM with 1:2,000,000 scale DLG files contains data in both standard and optional formats, as well as a "graphic" format.  The definitive guide to these file formats is the USGS document, "Digital Line Graphs from 1:2,000,000-Scale Maps: Data User's Guide."

This Import Filter reads DLG files in the "optional" format (*.LGO) and provides point, area, and curve objects.

For the 1:2,000,000-scale files, the USGS has divided the U.S. into 21 sections.  On the CD-ROM, the files associated with each section are stored in a separate subdirectory.

          The 21 subdirectories use the following naming convention:

               SECT00

          Each subdirectory starts with the letters "SECT" followed by the

          section number (01 to 21).  The sections correspond to the

          following regions:

SECT01	Northeastern States	SECT12	Arizona and New Mexico
SECT02	Middle Atlantic States	SECT13	Southern California
SECT03	Southeastern States	SECT14	Central Pacific States
SECT04	Florida	SECT15	Northwestern States
SECT05	Southern Mississippi Valley States	SECT16	Southeastern Alaska
SECT06	Central Mississippi Valley States	SECT17	Central Alaska
SECT07	Northern Great Lakes States	SECT18	Northern Alaska
SECT08	Southern Texas	SECT19	Southwestern Alaska
SECT09	Southern Plains States	SECT20	Aleutian Islands
SECT10	Central Plains States	SECT21	Hawaiian Islands
SECT11	Northern Plains States
Each section has one or more data files associated with it. The file naming convention used is as follows:

S00_XX.YYY

Each file starts with the letter "S", followed by the section number (01 to 21) and an underscore (_).  The XX stands for the feature code (sometimes referred to as Overlay or Base Category).  Feature codes are:

PB = Political Boundaries	CF = Cultural Features
AB = Administrative Boundaries	ST = Streams and Rivers
RD = Roads and Trails	WB = Water Bodies
RR = Railroads	HP = Hypsography (Continental Divide Only)

The YYY indicates the data format:

 	LGS = Line Graph Standard Format
LGO = Line Graph Optional Format
GRF = Graphic Format

If a section has more than one file for a feature, an underscore (_) and a letter are used to uniquely name the files.  Examples:

S01_WB_A.LGO
 	S01_WB_B.LGO

An .LGO file contains 15 records of general "header" information, followed by a series of Node, Area and Line entries, in that order.  Each Node is assigned a unique ID number (1,2,...). A Node entry contains the node's ID, its coordinate (all coordinates in "optional" format files are in Albers Equal Area Ellipsoid projection) and the IDs of each line segment that begins at, ends at, or passes through the node.  A "free-standing" node is one that has no line segments associated with it (i.e., the node is an isolated point).

Each Area is assigned a unique ID number (1,2,...). An Area entry contains the area's ID, the coordinate of its "reference point", a list of the IDs of each line segment that forms the area's boundary (including islands and lakes) and a list of attribute codes assigned to the area.  An area's reference point is that point on a map where a textual identifier for the area was placed (such as the name of a county).

Each Line is also assigned a unique ID number (1,2,...). A Line entry contains the line's ID, the Node ID of the node it starts at, the Node ID of the node it ends at, the Area ID of the area to the left of the line, the Area ID of the area to the right of the line, a list of coordinates of the line vertices and a list of attribute codes assigned to the line segment.  (Left and right are relative to the line's direction.  The line was digitized from the start point to the end point) . A "free-standing" line is one that is not part of an area boundary.

Attribute codes are assigned to areas and line segments for the purpose of identifying and/or grouping them.  An attribute code consists of two positive non-zero integers, a Major code value and a Minor code value.  For example, USGS Section 15 contains data for Washington, Oregon, Idaho and part of Montana.  In the Political Boundaries file (S15_PB.LGO), each county boundary area contains two attribute codes.  One indicates which state the county was associated with (Major code = 91, Minor code = two-digit FIPS code for the state) and the other indicates which county it is (Major code = 92, Minor code = three-digit FIPS code for the county).  For a list of attribute codes, see Major and Minor Attributes.


Nodes

All Nodes - If checked, consider all nodes. If they meet the selection criteria, they will be passed to the application as points.

Free standing only - If checked, consider only free-standing nodes. If they meet the selection criteria, they will be passed to the application as points. The only free-standing nodes are the map reference points.


Areas

All Areas - If checked, consider all area items. If they meet the selection criteria, they will be passed to the application.

Areas to curves - If checked, any selected areas passed to the application will be passed as a series of "curve" objects (lines), as opposed to the usual "area" objects (polygons).


Lines

All Lines - If checked, consider all line items. If they meet the selection criteria, they will be passed to the application as "curve" objects.

Free standing only - If checked, consider only free-standing line segments. This is the normal case, since one usually wants line segments that are area boundaries to be passed to the application as part of one or more "area" objects.


ID Number

Only items with the specified ID or IDs within the specified range will be passed back to the application. This is useful for importing a single item (or group of items) of one type. For example, to import just Area 100, make sure no Nodes or Lines boxes are checked, the All Areas box is checked and 100 is entered in the ID Number edit box. The Import Filter considers no nodes or lines and, within areas, only those with ID 100, and passes back one area, Area 100.


Major Attribute and Minor Attribute
Major and Minor Attribute

Only items that have at least one attribute code whose Major attribute falls within the specified range and whose corresponding Minor attribute falls within its specified range will be passed to the application.  For example, to import reservoirs only, open the appropriate water bodies file (S??_WB.LGO), check only All Areas, enter nothing in the ID Number edit box (means any ID) and enter 40 in the Major Attribute edit box (Water Bodies) and 106 (Reservoir) in the Minor Attribute edit box.

Area Attributes

Water Bodies

Political Boundaries

Administrative Boundaries

Line Attributes

Roads and Trails

Hypsography

Streams and Rivers

Water Bodies

Railroads

Political Boundaries

Administrative Boundaries

Cultural Features


Albers

The native file coordinates are returned to the application, but the application is also given the parameters used in the Albers projection. Use of this option makes sense only if the application understands how to handle an Albers projection.


Projection;Lat/Long
Lat/Long

The file coordinates are converted from their native Albers form to Lat/Long and the application is informed that it is receiving Lat/Long coordinates. This can lengthen the import time considerably, since substantial computation is involved.


No Projection
None (No Projection)

The native file coordinates are returned to the application, but the application is told that the projection is unknown.


Automatic
Automatically

When you check Automatically, the import filter applies an algorithm which requires no further input.  This algorithm reduces the number of vertices on most DLG line segments by about 50-80%.


Use Deviation Angle

Achieve finer control over vertex reduction by unchecking the Automatically box and entering a Deviation Angle (in degrees).  Use small angles (5-10 degrees) to eliminate a few points, somewhat larger angles (15-25 degrees) to eliminate more points and use larger angles (30-60 degrees) to eliminate the greatest possible number of points.


Area:Definition
Area

A closed region, bounded by lines, whose interior may be filled with a color or pattern.


Area ID:Definition
Area ID

A unique numeric (1,2,3,...) identifier assigned to each area in a DLG file.


Attribute:Definition
Attribute

A code number assigned to a line or area indicating a property associated with the line or area.  (Example: Attribute code 5001 assigned to a line indicates the line is part of an interstate highway.  Attribute code 110 assigned to an area indicates the area is a glacier or snowfield.)  More than one attribute code may be assigned to a line or area.


Coordinate:Definition
Coordinate

A pair of numeric values used to specify the location of a point.


Curve:Definition
Curve

One of several possible boundaries, consisting of one or more line segments joined end to end.  Curves, unlike regions, are not necessarily closed.


IDNumber:Definition
ID Number (Definition)

A unique numeric (1,2,3,...) identifier assigned to each node, area or line in a DLG file.


Island:Definition
Island

A separate included region of an area.  Hawaii is an area that consists of several islands.


Lake:Definition
Lake

An excluded region or "hole" within an area.


Latitude/Longitude:Definition
Latitude/Longitude

Latitude and longitude are spherical coordinates used to locate a point on the earth.  Many maps don't need to take the curvature of the earth into account.  For many applications, the earth can be assumed to be flat over a small area such as a county, so that the latitude/longitude system can be treated as a Cartesian coordinate system.

Longitude is the X coordinate and ranges from -180 degrees to +180 degrees.  Latitude is the Y coordinate and ranges from -90 degrees to +90 degrees.  Both latitude and longitude are specified in decimal degrees.


Line:Definition
Line

A series of connected points which always begin at a node and end at a node.


Line ID:Definition
Line ID

A unique numeric (1,2,3,...) identifier assigned to each line in a DLG file.


Node:Definition
Node

Most commonly, the point where two (or more) lines meet.  Sometimes there are "free-standing" nodes, which are isolated points.


Node ID:Definition
Node ID

A unique numeric (1,2,3,...) identifier assigned to each node in a DLG file.


Point:Definition
Point

A single location or position.  Sometimes symbols are placed on points to indicate various features.


Text ID:Definition
Primary or Secondary ID

Text string associated with an area, curve or point which allows the graphical object to be associated with external data.


Projection:Definition
Projection

A mathematical method for converting latitude-longitude coordinates which are spherical coordinates, into two-dimensional coordinates.  Maps are usually projected so that the geographic areas are not visibly distorted.


Macro Script Options

Since the Import Options dialog isn't displayed when the program is driven from a macro command script (via GS Scripter or Visual Basic), an Options="..." string can be specified in the script.  The string consists of comma-separated parameters, which specify the behavior of the various import options.  An typical example would be:

...(File="s21_wb.lgo",Options="Defaults=1,AreasToCurves=1")

This would first set all import options to their default values, then set the AreasToCurves option value to one, which would specify that any areas imported be converted to closed curves.

Option	Action	Default
Defaults=1	Set all options to their default values	No
ForgetOptions=1	Don't remember options for later use	No
AllNodes=1	Consider all nodes	No
FreeNodes=1	Consider only free-standing nodes	No
AllAreas=1	Consider all areas	Yes
AreasToCurves=1	Convert areas to closed curves	No
AllLines=1	Consider all lines	No
FreeLines=1	Consider only free-standing lines	Yes
Synthesize=1	Synthesize IDs for nodes, areas and lines	No
ThinAuto=1	Automatically thin vertices	Yes
Deviation=N.N	Set the deviation angle to N.N	0.0
IDSel=M-N	Only consider entities with IDs #M through #N	Blank
MajorSel=M-N	Only consider entities with Major Attribute #M-N	Blank
MinorSel=M-N	Only consider entities with Minor Attribute #M-N	Blank
Projection=0 Projection=1 Projection=2	Coordinates are Albers Equal Area projected Coordinates are converted to Latitude/Longitude Coordinates are not projected.	Yes No No


Area Attributes - Water Bodies

MAJOR	MINOR
CODE	CODE	DESCRIPTION
040	0100	Perennial lake or pond
	0102	Intermittent lake or pond
	0104	Dry lake or pond
	0105	Alkali flat
	0106	Reservoir
	0107	Intermittent reservoir
	0108	Coastline
	0110	Glacier or snowfield
	0150	Island
	0199	Area not in water body (remainder of map)


Area Attributes - Political Boundaries

MAJOR	MINOR
CODE	CODE	DESCRIPTION
090	0100	Civil township, district, precint, or barrio
	0101	Incorporated city, village, town, borough, or hamlet
	0197	Canada
	0198	Mexico
	0199	Area outside a national boundary
091	00--	State FIPS code, two digits flush right
092	0---	County or county equivalent FIPS code, three digits, flush right


Area Attributes - Administrative Boundaries

MAJOR	MINOR
CODE	CODE	DESCRIPTION
090	0103	National park, monument, lakeshore, parkway, battlefield, or recreation area
	0104	National forest or grassland
	0105	National wildlife refuge, game preserve, or fish hatchery
	0106	National scenic waterways or wilderness area
	0107	Indian reservation
	0108	Military reservation


Roads and Trails
Line Attributes - Roads and Trails

MAJOR	MINOR
CODE	CODE	DESCRIPTION
102	0---	Interstate route number, two or three digits flush right
103	0---	U.S. route number, two or three digits flush right
104	0---	State route number, two or three digits flush right
290	5001	Interstate
	5002	Major U.S., limited access, divided
	5003	Major State, limited access, divided
	5004	Major other, limited access, divided
	5005	Toll road*
	5006	Interstate connector*
	5007	Limited access, divided connector*
	5008	Toll connector*
	5009	Interstate, under construction
	5010	Interstate, proposed
	5013	Minor U.S., limited access, 3l0 km (500 mi) and longer
	5014	U.S. non-limited access, 3l0 km (500 mi) and longer
	5015	Minor U.S. limited access, less than 3l0 km (500 mi)
	5016	U.S. non-limited access, less than 3l0 km (500 mi)
	5017	Other minor U.S. limited access
	5018	Other U.S.**
	5019	Other minor State primary, limited access
	5020	Other State primary
	5021	Minor U.S. parallel, within l0 km (6 mi)
	5022	U.S. parallel, within l0 km (6 mi)
	5023	Minor State parallel, within l0 km (6 mi)
	5024	State parallel, within l0 km (6 mi)
	5028	State secondary (all weather, hard surface)
	5031	Light duty (all weather, improved)
	5041	Unimproved (fair or dry weather)
	5061	Tunnel, road
	5062	Ferry, auto
*	Redundant entry used to provide additional information.

**	U.S. business, alternate, bypass, and routes paralleling U.S. or Interstate routes within 10 to 25 km.


Hypsography
Line Attributes - Hypsography

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	2017	Continental Divide


Streams and Rivers
Line Attributes - Streams and Rivers

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	3001	River/stream (double line, shoreline)
	3002	River/stream (double line, centerline)
	3003*	River/stream (single line), perennial, length < 20 km, or < l2 mi
	3004	River/stream (single line), perennial, length 20-< 30 km, or l2-< l9 mi
	3005	River/stream (single line), perennial, length 30-< 40 km, or l9-< 25 mi
	3006	River/stream (single line), perennial, length 40-< 50 km, or 25-< 3l mi
	3007	River/stream (single line), perennial, length 50-< 60 km, or 3l-< 37 mi
	3008	River/stream (single line), perennial, length 60-< 80 km, or 37-< 50 mi
	3009	River/stream (single line), perennial, length 80-< l00 km, or 50-< 62 mi
	3010	River/stream (single line), perennial, length l00-< l25 km, or 62-< 78 mi
	3011	River/stream (single line), perennial, length l25-< l50 km, or 78-< 93 mi
	3012	River/stream (single line), perennial, length l50-< 200 km, or 93-< l24 mi
	3013	River/stream (single line), perennial, length 200-< 250 km, or l24-< l55 mi
	3014	River/stream (single line), perennial, length 250-< 300 km, or l55-< l86 mi
	3015	River/stream (single line), perennial, length 300-< 350 km, or l86-< 2l7 mi
	3016	River/stream (single line), perennial, length 350+ km, or 2l7+ mi
	3017*	River/stream (single line), intermittent, length < 20 km, or < l2 mi
	3018	River/stream (single line), intermittent, length 20-< 30 km, or l2-< l9 mi
	3019	River/stream (single line), intermittent, length 30-< 40 km, or l9-< 25 mi
	3020	River/stream (single line), intermittent, length 40-< 50 km, or 25-< 3l mi
	3021	River/stream (single line), intermittent, length 50-< 60 km, or 3l-< 37 mi
	3022	River/stream (single line), intermittent, length 60-< 80 km, or 37-< 50 mi
	3023	River/stream (single line), intermittent, length 80-< l00 km, or 50-< 62 mi
	3024	River/stream (single line), intermittent, length l00-< l25 km, or 62-< 78 mi
	3025	River/stream (single line), intermittent, length l25-< l50 km, or 78-< 93 mi
	3026	River/stream (single line), intermittent, length l50-< 200 km, or 93-< l24 mi
	3027	River/stream (single line), intermittent, length 200-< 250 km, or l24-< l55 mi
	3028	River/stream (single line), intermittent, length 250-< 300 km, or l55-< l86 mi
	3029	River/stream (single line), intermittent, length 300-< 350 km, or l86-< 2l7 mi
	3030	River/stream (single line), intermittent, length 350+ km, or 2l7+ mi
	3035*	River/stream, centerline in water body, perennial, length < 2 km, or < l mi
	3036	River/stream, centerline in water body, perennial, length 2-< 4 km, or l-< 2 mi
	3037	River/stream, centerline in water body, perennial, length 4-< 6 km, or 2-< 4 mi
	3038	River/stream, centerline in water body, perennial, length 6-< 8 km, or 4-< 5 mi
	3039	River/stream, centerline in water body, perennial, length 8-< l0 km, or 5-< 6 mi
	3040	River/stream, centerline in water body, perennial, length l0-< l5 km, or 6-< 9 mi
	3041	River/stream, centerline in water body, perennial, length l5-< 20 km, or 90-< l2 mi
	3042	River/stream, centerline in water body, perennial, length 20-< 25 km, or l2-< l6 mi
	3043	River/stream, centerline in water body, perennial, length 25-< 30 km, or l6-< l9 mi
	3044	River/stream, centerline in water body, perennial, length 30-< 40 km, or l9-< 25 mi
	3045	River/stream, centerline in water body, perennial, length 40-< 50 km, or 25-< 3l mi
	3046	River/stream, centerline in water body, perennial, length 50-< 60 km, or 3l-< 37 mi
	3047	River/stream, centerline in water body, perennial, length 60-< 80 km, or 37-< 50 mi
	3048	River/stream, centerline in water body, perennial, length 80+ km, or 50+ mi
	3050	River/stream, centerline in water body, intermittent, length < 2 km, or < l mi
	3051	River/stream, centerline in water body, intermittent, length 2-< 4 km, or l-< 2 mi
	3052	River/stream, centerline in water body, intermittent, length 4-< 6 km, or 2-< 4 mi
	3053	River/stream, centerline in water body, intermittent, length 5-< 8 km, or 4-< 5 mi
	3054	River/stream, centerline in water body, intermittent, length 8-< l0 km, or 5-< 6 mi
	3055	River/stream, centerline in water body, intermittent, length l0-< l5 km, or 6-< 9 mi
	3056	River/stream, centerline in water body, intermittent, length l5-< 20 km, or 9-< l2 mi
	3057	River/stream, centerline in water body, intermittent, length 20-< 25 km, or l2-< l6 mi
	3058	River/stream, centerline in water body, intermittent, length 25-< 30 km, or l6-< l9 mi
	3059	River/stream, centerline in water body, intermittent, length 30+ km, or l9+ mi
	3060	Braided stream, average width of braid 6+ km, or 4+ mi
	3061	Braided stream, average width of braid 0-< 2 km, or 0-< l mi
	3062	Braided stream, average width of braid 2-< 4 km, or l-< 2 mi
	3063	Braided stream, average width of braid 4-< 6 km, or 2-< 4 mi
	3070*	Canal, navigable, length < l km, or < l mi
	3071	Canal, navigable, length l-< l0 km, or l-< 6 mi
	3072	Canal, navigable, length l0-< 20 km, or 6-< l2 mi
	3073	Canal, navigable, length 20-< 40 km, or l2-< 25 mi
	3074	Canal, navigable, length 40-< 60 km, or 25-< 37 mi
	3075	Canal, navigable, length 60-< 80 km, or 37-< 50 mi
	3076	Canal, navigable, length 80+ km, or 50+ mi
	3077	Canal, other, length < l km, or < l mi
	3078	Canal, other, length l-< l0 km, or l-< 6 mi
	3079	Canal, other, length l0-< 20 km, or 6-< l2 mi
	3080	Canal, other, length 20-< 40 km, or l2-< 25 mi
	3081	Canal, other, length 40-< 60 km, or 25-< 37 mi
	3082	Canal, other, length 60-< 80 km, or 37-< 50 mi
	3083	Canal, other, length 80+ km, or 50+ mi
	3086	Ditch (perennial)
	3095	Intercoastal waterway
*	This code was only used in the Alaskan drainage files.

Note:  Listing of FIPS codes available as National Bureau of Standards (U.S.), Federal Information Processing Standards Publication (FIPS PUB) 6-3, 39 p. for sale by the National Technical Information Service, U.S. Department of Commerce, Springfield, VA  22161.


Water Bodies
Line Attributes - Water Bodies

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	4000	U.S. coastline including Great Lakes
	4001*	Perennial water body, lake, reservoir, and island, length < 2 km, or < l mi
	4002	Perennial water body, lake, reservoir, and island, length 2-< 4 km, or l-< 2 mi
	4003	Perennial water body, lake, reservoir, and island, length 4-< 6 km, or 2-< 4 mi
	4004	Perennial water body, lake, reservoir, and island, length 6-< 8 km, or 4-< 5 mi
	4005	Perennial water body, lake, reservoir, and island, length 8-< l0 km, or 5-< 6 mi
	4006	Perennial water body, lake, reservoir, and island, length l0-< l5 km, or 16-< 9 mi
	4007	Perennial water body, lake, reservoir, and island, length l5-< 20 km, or 9-< l2 mi
	4008	Perennial water body, lake, reservoir, and island, length 20-< 25 km, or l2-< l6 mi
	4010	Perennial water body, lake, reservoir, and island, length 30-< 40 km, or l9-< 25 mi
	4011	Perennial water body, lake, reservoir, and island, length 40-< 50 km, or 25-< 3l mi
	4012	Perennial water body, lake, reservoir, and island, length 50-< 60 km, or 3l-< 37 mi
	4013	Perennial water body, lake, reservoir, and island, length 60-< 80 km, or 37-< 50 mi
	4014	Perennial water body, lake, reservoir, and island, length 80+ km, or 50+ mi
	4021*	Intermittent water body, lake or reservoir, length < 2 km, or < l mi
	4022	Intermittent water body, lake or reservoir, length 2-< 4 km, or l-< 2 mi
	4023	Intermittent water body, lake or reservoir, length 4-< 6 km, or 2-< 4 mi
	4024	Intermittent water body, lake or reservoir, length 6-< 8 km, or 4-< 5 mi
	4025	Intermittent water body, lake or reservoir, length 8-< l0 km, or 5-< 6 mi
	4026	Intermittent water body, lake or reservoir, length l0-< l5 km, or 6-< 9 mi
	4027	Intermittent water body, lake or reservoir, length l5-< 20 km, or 9-< l2 mi
	4028	Intermittent water body, lake or reservoir, length 20-< 25 km, or l2-< l6 mi
	4029	Intermittent water body, lake or reservoir, length 25-< 30 km, or l6-< l9 mi
	4030	Intermittent water body, lake or reservoir, length 30-< 40 km, or l9-< 25 mi
	4031	Intermittent water body, lake or reservoir, length 40-< 50 km, or 25-< 3l mi
	4032	Intermittent water body, lake or reservoir, length 50-< 60 km, or 3l-< 37 mi
	4033	Intermittent water body, lake or reservoir, length 60-< 80 km, or 37-< 50 mi
	4034	Intermittent water body, lake or reservoir, length 80+ km, or 50+ mi
	4040*	Marsh/swamp and salt marsh, length < l0 km, or < 6 mi
	4041	Marsh/swamp and salt marsh, length l0-< l7 km, or 6-< ll mi
	4042	Marsh/swamp and salt marsh, length l7-< 25 km, or ll-< l6 mi
	4043	Marsh/swamp and salt marsh, length 25-< 37 km, or l6-< 23 mi
	4044	Marsh/swamp and salt marsh, length 37-< 50 km, or 23-< 3l mi
	4045	Marsh/swamp and salt marsh, length 50+ km, or 3l+ mi
	4050	Dry lake and alkali flat, length < 2 km, or < l mi
	4051	Dry lake and alkali flat, length 2-< 4 km, or l-< 2 mi
	4052	Dry lake and alkali flat, length 4-< 6 km, or 2-< 4 mi
	4053	Dry lake and alkali flat, length 6+ km, or 4+ mi
	4060*	Glacier, length < 4 km, or < 2 mi
	4061	Glacier, length 4-< l0 km, or 2-< 6 mi
	4062	Glacier, length l0-< l7 km, or 6-< ll mi
	4063	Glacier, length l7-< 25 km, or ll-< l6 mi
	4064	Glacier, length 25-< 37 km, or l6-< 23 mi
	4065	Glacier, length 37-< 50 km, or 23-< 3l mi
	4066	Glacier, length 50+ km, or 3l+ mi
*	This code was only used in the Alaskan drainage files.


Railroads
Line Attributes - Railroads

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	5071	Class 1, category A, main line
	5072	Class 1, category B, main line
	5073	Class 1, category A, branch line
	5074	Class 1, category B, branch line
	5075	Other railroad
	5078	Tunnel, railroad
	5079	Ferry, railroad
	5080	Class 1, category A, main-line connector1


Political Boundaries
Line Attributes - Political Boundaries*

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	6000	International treaty line
	6001	National (land)
	6002	National (water)
	6005	State/provincial (land)
	6006	State/provincial (water)
	6009	County, parish, Alaskan borough, or large independent city (land)
	6010	County, parish, Alaskan borough, or large independent city (water)
	6011	Corporate limit (1 million and over population)
	6012	Corporate limit (1/2 to less than l million population)
	6014	Small independent city (usually not shown as a county)

*	Maritime boundary areas are usually closed by unattributed arbitrary extension lines.


Administrative Boundaries
Line Attributes - Administrative Boundaries

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	6021	National park, length at longest dimension 0-< 2 km, or 0-< l mi
	6022	National park, length at longest dimension 2-< 8 km, or l-< 5 mi
	6023	National park, length at longest dimension 8-< l4 km, or 5-< 9 mi
	6024	National park, length at longest dimension 4-< 20 km, or 9-< 12 mi
	6025	National park, length at longest dimension 20+ km, or 12+ mi
	6026	National monument, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6027	National monument, length at longest dimension 2-< 8 km, or 1-< 5 mi
	6028	National monument, length at longest dimension 8-< 14 km, or 5-< 9 mi
	6029	National monument, length at longest dimension 14-< 20 km, or 9-< 12 mi
	6030	National monument, length at longest dimension 20+ km, or 12+ mi
	6031	National seashore or lakeshore, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6032	National seashore or lakeshore, length at longest dimension 2-< 8 km, or 1-< 5 mi
	6035	National seashore or lakeshore, length at longest dimension 20+ km, or 12+ mi
	6036	National recreation area, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6037	National recreation area, length at longest dimension 2-< 8 km, or 1-< 5 mi
	6038	National recreation area, length at longest dimension 8-< 14 km, or 5-< 9 mi
	6039	National recreation area, length at longest dimension 14-< 20 km, or 9-< 12 mi
	6040	National recreation area, length at longest dimension 20+ km, or 12+ mi
	6041	National wilderness area, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6042	National wilderness area, length at longest dimension 2-< 8 km, or 1-< 5 mi
	6043	National wilderness area, length at longest dimension 8-< 14 km, or 5-< 9 mi
	6044	National wilderness area, length at longest dimension 14-< 20 km, or 9-< 12 mi
	6045	National wilderness area, length at longest dimension 20+ km, or 12+ mi
	6051	National forest, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6052	National forest, length at longest dimension 2-< 8 km, or 1-< 5 mi
	6053	National forest, length at longest dimension 8-< l4 km, or 5-< 9 mi
	6054	National forest, length at longest dimension l4-< 20 km, or 9-< l2 mi
	6055	National forest, length at longest dimension 20+ km, or l2+ mi
	6056	National grassland, length at longest dimension 0-< 2 km, or 0-< 1 mi
	6057	National grassland, length at longest dimension 2-< 8 km, or l-< 5 mi
	6058	National grassland, length at longest dimension 8-< 14 km, or 5-< 9 mi
	6059	National grassland, length at longest dimension 14-< 20 km, or 9-< 12 mi
	6060	National grassland, length at longest dimension 20+ km, or l2+ mi
	6061	National wildlife refuge, length at longest dimension 0-< 2 km, or 0-< l mi
	6062	National wildlife refuge, length at longest dimension 2-< 8 km, or l-< 5 mi
	6063	National wildlife refuge, length at longest dimension 8-< l4 km, or 5-< 9 mi
	6064	National wildlife refuge, length at longest dimension l4-< 20 km, or 9-< l2 mi
	6065	National wildlife refuge, length at longest dimension 20+ km, or l2+ mi
	6066	Federal Indian reservation, length at longest dimension 0-< 2 km, or 0-< l mi
	6067	Federal Indian reservation, length at longest dimension 2-< 8 km, or l-< 5 mi
	6068	Federal Indian reservation, length at longest dimension 8-< l4 km, or 5-< 9 mi
	6069	Federal Indian reservation, length at longest dimension l4-< 20 km, or 9-< l2 mi
	6070	Federal Indian reservation, length at longest dimension 20+ km, or l2+ mi
	6081	Federal Military reservation, areas of l-< 405 ha, or l-< l000 acres
	6082	Federal Military reservation, areas of 405+ ha, or l000+ acres
	6087	National park, closure line
	6088	National monument, closure line
	6089	National seashore or lakeshore, closure line
	6090	National recreation area, closure line
	6091	National wilderness area, closure line
	6092	National forest, closure line
	6093	National grassland, closure line
	6094	National wildlife refuge, closure line
	6095	Indian reservation, closure line
	6097	Military reservation, closure line


Cultural Features
Line Attributes - Cultural Features

MAJOR	MINOR
CODE	CODE	DESCRIPTION
290	700l	Commmercial airfield
	7002	Military airfield
	7020	Alaska pipeline


General Messages

The following messages may appear while importing files in any format.

Application has no Color dialog!

Application has not Line Attribute dialog!

Bad values in .INI file or Options String

Can't load Import Filter resource

Can't open import file

Can't show import status dialog

Error reading import file

Error reading Import Filter profile item

Import file is of incorrect format or type

Import Filter passed bad parameter

Internal inconsistency detected in Import Filter

Invalid Import Filter instance handle

Out of global memory

Out of local memory

Error writing Import Filter profile item


Application has no Color dialog!

The program has detected an internal error.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Application has no Line Attribute dialog!

The program has detected an internal error.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Bad values in .INI file or Options String

A bad value has been read from the application's .INI file or Options String.  Check the .INI file or Options String to make sure the values are valid.


Can't load Import Filter resource

Free memory may be exhausted, or memory contents are corrupted.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Can't open import file

The file you selected to import exists, but cannot be opened.  Perhaps you don't have the proper access permissions.  This message sometimes results if the file is not in the proper format.


Can't show status dialog
Can't show import status dialog

Free memory may be exhausted, or memory contents are corrupted.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Error reading import file

The import filter cannot read the indicated file. Perhaps the file has been corrupted.


Error reading Import Filter profile item

Information stored in the application's .INI file could not be located.  If the .INI file is corrupted, you will need to restore a backup copy or, possibly, reinstall the stoftware.  You should probably check with Technical Support before proceeding.


Import file is of incorrect format or type

The specified file is not the type indicated by its extension, or the file has been corrupted or is not in the proper format.


Import Filter passed bad parameter

The program has detected an internal error.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Internal inconsistency detected in Import Filter

The program has detected an internal error.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Invalid Import Filter instance handle

The program has detected an internal error.  Close all active applications and restart Windows.  Please report this situation to Technical Support.


Out of global memory

Free memory may be exhausted.  Close all active applications and restart Windows.  If you get this message often, contact Technical Support.


Out of local memory

Free memory may be exhausted.  Close all active applications and restart Windows.  If you get this message often, contact Technical Support.


Error writing Import Filter profile item

The program encountered an error while writing information to the application's .INI file. The path of the .INI file may have be been changed or a section in the file may have been lost. You should probably check with Technical Support.