http://infoecho.net/cschin/topo3d/
DRG or Digital Raster Graphic is a topograhpic map that is scanned and used to show features of a map. They are used in mpa making because of how in detail it can show the physical features of an area. The above picture is of Yosemite National Park. Raster Graphics are created by the USGS and are printed with a resolution of 250 dots per inch.
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