This map is a DRG (Digital Raster Graphic) of the Potomac River with Washington D.C. shown in the southwestern quadrant and the Georgetown neighborhood in the northeastern quadrant. DRGs are used as base maps which other data may be added to later. The DRG map's purpose is to ensure that the new data is correct (if it doesn't fit it ain't worth spit). DRGs may be viewed by using one of three different programs which vary, depending on what area of the U.S. the map covers.
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