A DLG is derived from USGS maps or USGS map-related sources. DLGs can be made on three different scales: large scale, intermediate scale, and small scale. A DLG is a type of digital vector data. The data displayed can come from a wide range of variables including, but not limited to, topography, hydrography, boundaries, roads, and utility lines. The data is presented in vectors and stored as arcs, points, and polygons. The picture above is an example DLG of Beaufort, South Carolina.
http://www.dnr.sc.gov/GIS/descdlg.html
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