DLGs are distributed by the government, and are available at 1:100,000 and 1:24,000 scales. Features are in separate files that most GIS packages will import, although extra data manipulation is often necessary.
DLGs compiled from 1:2,000,000-scale maps are available for three categories: (1) boundaries, which include state and county boundaries and federally administered lands; (2) transportation, which includes roads, railroads, and airports; ...
1:100,000-scale DLGs are derived from USGS 30- by 60-minute quadrangle maps and are referenced to either NAD27 or NAD83.
To access and download 1:100K USGS DLG data, please select a State on the map below.
Digital Line Graphs (DLGs) and Digital Elevation Maps (DEMs) were the two types of data sets used to create visualizations with the fire data. Gerald I. Evenden had developed Cartographic Projection Procedures for the UNIX environment.
Data files containing vector representations of cartographic information derived from USGS maps and related sources. DLGs include information from the USGS planimetric map base categories such as transportation, hydrography, contours, ...
DLG stands for digital line graph, a form of digital map developed by the United States Geological Survey. DLGs supply users with the digital version of information printed on USGS topographical quadrangle maps.
Georeferenced map images are available from the USGS as digital raster graphics (DRGs), in addition to digital data sets based on USGS maps (notably Digital Line Graphs (DLGs) and digital elevation models (DEMs)).
DLGs supply users with the digital version of information printed on USGS topographical quadrangle maps. domain System context: A class of systems that have similar requirements and capabilities.
 See also: Information, Digital, Geographic, USGS, Digital Line Graph
  
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