http://pubs.usgs.gov/of/2003/of03-471/domier/index.html
A digital line graph displays digital vector data in the form of lines (arcs), points, and areas (polygons). DLGs are able to display multiple forms of cartographic data such as PLSS, political boundaries, topography, roads, hydrography. The image above is a DLG of a region of Illinois.
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