Digital Line Graph (DLG)
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.
Digital Line Graph (DLG)
The digital format standards published by USGS for exchange of cartographic data files and for which Digital Line Graph data sets are delivered by USGS. Digital Line Graph files from the U.S. Geological Survey.
Digital Line Graph (DLG) 1. In reference to data, the geographic and tabular data files obtained from the USGS that may include base categories such as transportation, hydrography, contours, and public land survey boundaries.
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Digital Line Graphs
Digital line graphs (DLGs) are the digital representation of the planimetric information (line map data) shown on a map.
Digital Line Graph--Optional
DLG2DEM
Digital Line Graph to Digital Elevation Model (production software) ...
1. Digital Line Graph files from the U.S. Geological Survey (USGS), including data from the base map categories such as transportation, hydrography, contours, and public land survey boundaries.
DLG (Digital Line Graph) - (1) A digital data format used by the USGS for large scale digital topographic maps. (2) A digital data file standard published by the USGS for exchanging digital cartographic data files.
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DLG: 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.
DLG : Digital Line Graph files from the U.S. Geological Survey
DXF: Data Exchange Format. A format for storing vector data in ASCII or binary files; used by AutoCad or other CAD software and convertible to ARC/INFO coverages.
Created from digital line graph (DLG) contours or equivalent, from any USGS map series up to 1:100000 scale ...
Figure 4. USGS digital line graph map of the State of Connecticut from 1:2,000,000-scale data. The Broad Brook and Ellington 7.5-minute quadrangle areas are outlined in black in the upper middle.
Digital Line Graph (DLG) p. 82 a data format developed by US Geological Survey National Mapping Division that uses a topological vector model. digitizer p.
Digital databases used in the models included digital elevation model (DEM), digital line graph (DLG), vegetation (based on Soil Conservation Service DLG data), and landuse boundaries--based on Defense Mapping Agency data.
Digital Line Graphs (DLGs) are digital vector representations of cartographic information derived from USGS maps and related sources. Intermediate-scale DLG's are derived from USGS 1:100,000-scale 30- by 60- minute quadrangle maps.
[data models] Acronym for digital line graph. Data files containing vector representations of cartographic information derived from USGS maps and related sources.
One convenient source of this type of data is the USGS Digital Line Graphics (DLG) data base. Unlike the DEM database, which is essentially raster data, the DLG is a vector data base file, so it can handle many types of data suitable for overlay.
Level 2 DEM: Level 2 DEM's are produced by converting 1:24,000-scale and 1:100,000-scale hypsography digital line graph (DLG) data to DEM format or the DEM's are generated from vector data derived from scanned raster files of USGS 1:24.
this type of data from USGS topographic maps is becoming available in digital form as DLG (digital line graph) files
elevation data is available from the USGS in the form of DEMs, (digital elevation models) at various resolutions ...
The digital orthophoto is useful as a layer of a geographic information system (GIS) and as a tool for revision of digital line graphs and topographic 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)).
The road network from a USGS digital line graph includes information on the types of roads, which range from rough trails to divided highways.
 See also: Digital, Information, GIS, Geographic, Feature
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