Digital Line Graphs, or DLGs, are similar to DRG in their derivation from USGS topographical maps, however, they are represented through vectors rather then raster cells. On a normal view, one would never be able to see the actual vectors because they are far too small. DLGs are distributed by the USGS for use in mapping and GIS systems. These georeferenced images are incredibly useful for visualizing land use coverage. This map of the Southwestern U.S. used a DLG to characterize the topography based on Federal land ownership.
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