Above, is a digital raster graphic of a section of Washington West, D.C. as can be seen from the Potomac River. A DRG is a scanned image of a USGS topographic map with its features linked to latitude/longitude coordinates or UTM coordinated otherwise known as georectification. All of the features are georeferenced to the surface of the earth and are linked directly to real world coordinate systems. This type of map could be quite useful in distinguishing exact locations of physical features in relation to one another and the viewer.
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