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General Listing
Title of Listing:
Digital Line Graphs (DLGs)
Category:
Maps/Geographic Data
Subcategory:
US Geological Survey-USGS, All Listings
Date:
Document #:
Web Site:
http://www.fgdc.gov/FGDP/Digital_Line_Graphs_(DLGs).html
Email:
custserv@edcmail.cr.usgs.gov
Abstract:

Digital representations by points, lines and areas of planimetric information derived from 7.5- and 15-minute scale topographic quadrangle maps (large-scale); 30- by 60-minute intermediate scale maps; and 1:2 million-scale (small scale) sectional National Atlas maps.

          These DLGs are digital representations of program-quadrangle format and sectional maps. All DLG data distributed by the United States Geological Survey (USGS) are DLG-Level 3 (DLG-3), which means the data contain a full range of attribute codes, have full topological structuring, and have passed certain quality-control checks.

          Large-scale DLG data files are available for the U.S. Public Land Survey, boundaries, transportation, hydrography and in some areas, hypsography. They are produced in 7.5-minute by 7.5-minute units which correspond to USGS 1:20,000-,1:24,000-, 1:25,000-scale topographic quadrangle maps. The unit sizes of 1:63,360-scale Alaska quadrangles vary depending on the latitudinal location of the unit.

          Intermediate (1:100,000 scale) DLG data files that cover transportation and hydrography, are available for all States except Alaska. Intermediate -scale DLG data are sold in 30-minute by 30-minute units which correspond to the east half or west half of USGS 30- by 60-minute 1:100,000-scale topographic quadrangle maps. Each 30-minute unit is produced and distributed as four 15- by 15-minute cells, except in high-density areas, where the 15-minute cells may be subdivided into four 7.5-minute cells.

          National Atlas sectionals of the United States at 1:2 million scale are available for boundaries, transportation and hydrography. These small-scale DLG data correspond to USGS 1:2 million-scale sectional maps of the National Atlas of the United States of America and are sold in 21 units. Fifteen sections cover the conterminous United States, five cover Alaska and one covers Hawaii. These sectional DLGs are usually sold in multi-State units. However, some may cover only one Sate or a portion of a State.

          USGS Information Services accepts fax and mail orders only.

          Visit the USGS at http://edcwww.cr.usgs.gov/webglis or http://mapping.usgs.gov
Topics
Mapping/GIS

Additional Topics/Tags/Keywords
Boundaries, Airports, Contours, Elevation, Topography

Organization:
US Department of the Interior (DOI), US Geological Survey (USGS)
Address:
Information Services
Box 25286
Phone:
DescriptionNumber
City:
Denver
1.
Information Services (800) 435-7627
State/Province/Territory:
CO
2.
Earth Science Information Center(800) 872-6277
Zip/Postal Code:
80225
3.
EROS Data Center(605) 594-6151
Country:
United States
4.
Fax: Information Services (303) 202-4693
Branch Locations: