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U.S. Geological Survey
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Public
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Penn State
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District Of Columbia, United States
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Year
2000
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1. 1:24,000 - 7.5 minute digital elevation models (DEM) for the District of Columbia (30 meter)
2000. U.S. Geological Survey. Digital Elevation Model (DEM) is the terminology adopted by the USGS to describe terrain elevation data sets in a digital raster form. The standard...
2. 1:24,000 - 7.5 minute Digital Raster Graphics for the District of Columbia
2000. U.S. Geological Survey. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...