These metadata describe the 1:2,000,000-scale digital line graph holdings of the USGS for the conterminous United States. This is a data-set level implementation of the Content Standards for Digital Geospatial Metadata, and will be in place until file-specific information for individual digital line graphs is available.
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1980
Title: 1:2,000,000-scale Digital Line Graphs
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Description:
Abstract:
The DLG data files derived from the 1:2,000,000-scale maps contain
selected base categories of cartographic data in digital form. The data
files are derived from the sectional maps of the 1970 National Atlas
of the United States of America. The Boundaries category includes
boundary information collected in two separate subcategories:
(1) Political Boundaries and (2) Administrative Boundaries. The
Hydrography data includes data in three separate subcategories:
(1) Streams, (2) Water Bodies, and (3) Hypsography (Continental
Divide only). The Transportation category of data includes major
transportation systems collected in three separate subcategories: (1)
Roads and Trails, (2) Railroads, and (3) Cultural Features (airports
and Alaska pipeline).
Purpose:
DLG's depict information about geographic features on or near
the surface of the Earth, terrain, and political and administrative
units. These data were collected as part of the National Mapping
Program.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1972
Ending_Date: 1979
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: Irregular
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -179.1000
East_Bounding_Coordinate: -067.9500
North_Bounding_Coordinate: 71.3833
South_Bounding_Coordinate: 18.9167
Keywords:
Theme:
Theme_Keyword_Thesaurus: None.
Theme_Keyword: digital line graph
Theme_Keyword: DLG
Theme_Keyword: hydrography
Theme_Keyword: transportation
Theme_Keyword: boundaries
Theme_Keyword: U.S. Public Land Survey System
Theme_Keyword: hypsography
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1977, Countries, dependencies,
areas of special sovereignty, and their principal administrative divisions
(Federal Information Processing Standard 10-3):Washington, D.C.,
National Institute of Standards and Technology.
Place_Keyword: US
Place_Keyword: CA
Place_Keyword: MX
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification
of the States, the District of Columbia and the outlying areas of
The United States, and associated areas
(Federal Information Processing Standard 5-2):Washington ,D. C.,
National Institute of Standards and Technology.
Place_Keyword: FIPS codes for states covered
Access_Constraints: None
Use_Constraints:
None. Acknowledgement of the U.S. Geological Survey would
be appreciated in products derived from these data.
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attribute accuracy was tested by manual comparison of the source
with hard copy plots.
Logical_Consistency_Report:
The topological structure of each DLG file is fully validated by software.
There are no extraneous intersections; that is , a line does not join or cross
another line, or itself, except at a node. No line extends through a node.
Polygon (area) adjacency is also validated; that is, area left and right topological
attributes of lines are consistent throughout the file. The neatline is free of gaps.
Validation of DLG data is performed for each category within a file.
Completeness_Report:
For Boundary category:
Political boundaries: Data completeness generally reflects the content of the
original source graphic. Selective updating of the maps was done prior to
digitizing. The Political Boundaries category of data includes States and County
boundaries.
Administrative boundaries: Data completeness generally reflects the content of
the original source graphic. Selective updating of the maps was done prior to
digitizing. The Administrative Boundaries category of data includes federally
administered forests, parks, and wildlife refuges.
For Hydrography category:
Streams: Data completeness generally reflects the content of the original
source graphic. Selective updating of the maps was done prior to digitizing.
The Hydrography category includes perennial and intermittent streams and canals.
Water Bodies: Data completeness generally reflects the content of the original
source graphic. Selective updating of the maps was done prior to digitizing.
Water bodies include perennial, intermittent and dry lakes, swamps and glaciers.
Hypsography:
Data completeness generally reflects the content of the original source graphic.
Selective updating of the maps was done prior to digitizing. Hypsography data
is limited to the Continental Divide.
For Transportation category:
Roads and Trails: Data completeness generally reflects the content of the original
source graphic. Selective updating of the maps was done prior to digitizing. The
Roads and Trails category includes Interstate and primary State highways.
Railroads: Data completeness generally reflects the content of the original source
graphic. Selective updating of the maps was done prior to digitizing. The railroads
category of data includes main line and branch line railroads.
Cultural Features: Data completeness generally reflects the content of the original
source graphic. Selective updating of the maps was done prior to digitizing. The
Cultural Features are limited to airports and the Alaska pipeline.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Comparison to a graphic source or image source is used as control to assess
digital positional accuracy. Cartographic offsets may be present on graphic
sources, due to scale and legibility constraints. Data has been vertically aligned
between categories of data.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1970
Title: The National Atlas of the United States of America
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Source_Scale_Denominator: 2000000
Type_of_Source_Media: stable-base material
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1970
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: MAP1
Source_Contribution: spatial and attribute information
Source_Information:
Source_Citation:
Citation_Information:
Originator: Bureau of the Census
Publication_Date: 1979
Title: unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: Bureau of the Census
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVBND1
Source_Contribution:
spatial and attribute information to update political boundaries
and Alaskan borough boundaries
Source_Information:
Source_Citation:
Citation_Information:
Originator: Various Federal Agencies
Publication_Date: various
Title: unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: various
Publisher: various
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: various
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVBND2
Source_Contribution:
spatial and attribute information to update administrative
boundaries
Source_Information:
Source_Citation:
Citation_Information:
Originator: various
Publication_Date: 1980
Title: unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: various
Publisher: various
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVRAT1
Source_Contribution: spatial and attribute information to update roads and trails data
Source_Information:
Source_Citation:
Citation_Information:
Originator: Interstate Commerce Commission
Publication_Date: 1979
Title: unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: Interstate Commerce Commission
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVRRS1
Source_Contribution: spatial and attribute information to update railroad data
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1979
Title: Landsat imagery
Geospatial_Data_Presentation_Form: remote-sensing imagery
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVHYD1
Source_Contribution: spatial and attribute information to update streams in Alaska
Source_Information:
Source_Citation:
Citation_Information:
Originator: National Oceanic and Atmospheric Administration
Publication_Date: 1979
Title: Sectional Aeronautical Charts
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: National Oceanic and Atmospheric Administration
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVHYD2
Source_Contribution: spatial and attribute information to update major reservoirs
Source_Information:
Source_Citation:
Citation_Information:
Originator: Federal Aviation Administration
Publication_Date: 1980
Title: Landsat imagery
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Washington, D.C.
Publisher: Federal Aviation Administration
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1980
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVCUL1
Source_Contribution:
spatial and attribute information to update cultural features and
airport data
Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 1979
Title: unknown
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Reston, Virginia
Publisher: U.S. Geological Survey
Other_Citation_Details:
This source citation references a source used to revise the
published 1:2,000,000-scale National Atlas sectional maps prior
to digitization. Individual files within the series may or may
not have been altered as a result of this source.
Source_Scale_Denominator: various
Type_of_Source_Media: various
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1979
Source_Currentness_Reference: publication date
Source_Citation_Abbreviation: REVCUL2
Source_Contribution: spatial and attribute information to update the Alaskan Pipeline
Process_Step:
Process_Description:
This file was originally digitized by the National Mapping Division
based on the sectional maps contained in 'The National Atlas of the
United States of America published by the USGS in 1970. At the time
of digitization in the late 1970s, most of the information contained in the
maps was updated, using the latest available sourcematerials. The digital
data were produced by manually digitizing from stable-based copy of the
graphic material using a digitizing table with a resolution of 0.001 inches
and an absolute accuracy of 0.003 to 0.005 inches. The digital data were
checked for position by visually comparing proof plots with the graphic
source. The digital data were checked for classification by manually checking
proof plots against code listings.
This file has undergone digital revision. The digital revision uses ancillary
source, with no field verification
Source_Used_Citation_Abbreviation:
MAP 1, REVBND1, REVBND2, REVRAT1, REVRRS1, REVHYD1,
REVHYD2, REVCUL1, REVCUL2
Process_Date: 1983
Indirect_Spatial_Reference:
For Public Land Survey System:
U.S. Department of the Interior, Bureau of Land Management:
U.S. Public Land Survey System
For Boundaries:
U.S. Department of Commerce, 1977, Countries, dependencies, areas
of special sovereignty, and their principal administrative divisions.
(Federal Information Processing Standard 10-3): Washington,D.C.,
National Institute of Standards and Technology.
U.S. Department of Commerce, 1987, Codes for the identification
of the States, the District of Columbia and the outlying areas of
The United States, and associated areas
(Federal Information Processing Standard 5-2): Washington, D. C.,
National Institute of Standards and Technology.
U.S. Department of Commerce,1990, Counties and equivalent
entities of The United States, its possessions, and associated areas
(Federal Information Processing Standard 6-4): Washington, D.C.
National Institute of Standards and Technology.
Direct_Spatial_Reference_Method: Vector
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Albers Conical Equal Area
Albers_Conical_Equal_Area:
Standard_Parallel:
1st standard parallel 29.5N for conterminous US;
8.0N for Hawaii; 55.0N for Alaska
Standard_Parallel:
2nd standard parallel 45.5N for conterminous US;
18.0N for Hawaii; 65.0N for Alaska
Longitude_of_Central_Meridian:
96.0W for conterminous US; 157.0W for Hawaii;
154.0W for Alaska
Latitude_of_Projection_Origin:
23.0N for conterminous US; 3.0N for Hawaii;
50.0N for Alaska
False_Easting: 0.0
False_Northing: 0.0
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 50.80
Ordinate_Resolution: 50.80
Planar_Distance_Units: meters
Geodetic_Model:
Horizontal_Datum_Name: North American Datum 1927
Ellipsoid_Name: Clark 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98
Overview_Description:
Entity_and_Attribute_Overview:
DLG3 attribute codes are used to describe the physical
and cultural characteristics of DLG node, line, and area
elements. Attribute codes are used to reduce redundant information,
provide enough reference information to support integration with larger
data base, and describe the relationships between cartographic elements.
Each DLG element has one or more attribute codes composed of a three
digit major code and a four-digit minor code.
Entity_and_Attribute_Detail_Citation:
U.S.Department of the Interior, U.S.Geological Survey, 1990,
1:2,000,000-Scale Digital Line Graphs, Data Users Guide 3,
Reston, Virginia
A hypertext extract is available at:
<URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2mil>
Softcopy in ASCII format is available at:
<URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.txt>
Softcopy in WordPerfect format is available at:
<URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.wp5>
Softcopy in PostScript format is available at:
<URL: ftp://www-nmd.usgs.gov/pub/ti/DLG/2mdlgguide/dugdlg2m.ps>
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Science Information Center, U.S.Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 507 National Center
City: Reston
State_or_Province: Virginia
Postal_Code: 22092
Contact_Voice_Telephone: 1 800 USA MAPS
Hours_of_Service: 0800-1600
Contact_Instructions:
In addition to the address above there are other ESIC offices
throughout the country. A full list of these offices is at:
<URL: http://www-nmd.usgs.gov/esic/esic_index.html>
Resource_Description: 1:2,000,000-scale digital line graphs
Distribution_Liability:
Although these data have been processed successfully on a computer system at the
U.S. Geological Survey, no warranty expressed or implied is made by the USGS
regarding the utility of the data on any other system, nor shall the act of
distribution constitute any such warranty. The Geological Survey will warrant the
delivery of this product in computer-readable format, and will offer appropriate
adjustment of credit when the product is determined unreadable by correctly adjusted
computer input peripherals, or when the physical medium is delivered in damaged
condition. Requests for adjustment of credit must be made within 90 day from the date
of this shipment from the ordering site.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: DLG
Format_Version_Date: 198805
Format_Specification: Optional
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2milfig/mapindex>
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<URL: ftp://edcftp.cr.usgs.gov/pub/data/DLG/2M/>
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Offline_Option:
Offline_Media: 9-track tape
Recording_Capacity:
Recording_Density: 1600
Recording_Density: 6250
Recording_Density_Units: characters per inch
Recording_Format:
ASCII; available unlabelled or with ANSI-standard labels; available
block sizes are multiples of 80 characters ranging from 8000 to 32720 characters.
Digital_Form:
Digital_Transfer_Information:
Format_Name: DLG
Format_Version_Date: 198805
Format_Specification: Standard
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<URL: http://edcwww.cr.usgs.gov/glis/hyper/guide/2milfig/mapindex>
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<URL: ftp://edcftp.cr.usgs.gov/pub/data/DLG/2M/>
Offline_Option:
Offline_Media: CD-ROM
Recording_Format: ISO 9660
Offline_Option:
Offline_Media: 9-track tape
Recording_Capacity:
Recording_Density: 1600
Recording_Density: 6250
Recording_Density_Units: characters per inch
Recording_Format:
ASCII; available unlabelled or with ANSI- standard labels; available
block sizes are multiples of 144 characters ranging from 8064 to 32720
characters.
Fees:
The online copy of the data set (when available electronically) may be
accessed without charge.
For 8-mm cartridge tape and 9-track tape the costs are:
1 digital product = $40
2 digital products = $60
3 digital products = $80
4 digital products = $100
5 digital products = $120
6 or more = $90 plus $7 per each product over six
For CD-ROM the price for each disc is $32
A $3.50 handling charge is applied to all mail orders.
Ordering_Instructions: The CD-ROM contains data for all 50 states.
Metadata_Date: 19901
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 508 National Center
City: Reston
State_or_Province: Virginia
Postal_Code: 22092
Contact_Voice_Telephone: 1 703 648 4543
Metadata_Standard_Name: Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: 19940608