https://www.e-education.psu.edu/natureofgeoinfo/c6_p6.htmlDRG maps are scanned raster images of USGS topographic maps. Above is a DRG map of Bushkill, PA, showing lakes rivers and streams with the use of contour lines to represent elevation. DRG maps are often used when other digital data is superimposed. therefore the accuracy of a vector file containing these lakes and rivers can be checked by plotting it over a DRG.
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