A D.L.G. or digital line graph is a cartographic map feature represented in digital vector form that was created by the United States Geological Survey. D.L.G.s are collected from U.S.G.S. maps and are distributed in large, intermediate and small-scale with different categories of features depending on the scale. The D.L.G. features national park boundaries, public land section lines, hydrographic features, topographic contour lines, Roads, trails, and railroads. D.L.G.s are a soft copy overlay which allowed features to be optional and modified to what the user requires. The image above is a D.L.G. on a U.S.G.S. map section where you can individually distinguish roads, hydrographic features as well as topographic contour lines.
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