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1. 1:100,000 Digital Raster Graphics for Virginia

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...

2. 1:24,000 - 7.5 minute digital elevation models (DEM) for Virginia (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...

3. 1:250,000 Digital Raster Graphics for Virginia

2000. A Digital Raster Graphic (DRG) is a raster image of a scanned USGS topographic or planimetric map including the collar information, georeferenced t...

4. Digital Orthophoto (DOQQ - quarter-quadrangle) for Virginia

2000. U.S. Geologic Survey; Pennsylvania Bureau of Topographic and Geologic Survey. Orthophotos combine the image characteristics of a photograph with the geometric qualities of a map. The primary digital orthophotoquad (DOQ) is a ...