DLG maps are another computer-generated and cartographic map feature distributed by the USGS. DLG stands for Digital Line Graph that represents digital vector data, depicting a variety of information using contour lines. Because DLG's are in vector format, geographic information displayed on these maps are coded in points, lines, and polygons most often. The above image is an example of DLG, because it is a digital vector representation of features of a place on a standard USGS map, and is clearly displayed using lines to represent its data.
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