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Imagery and Base Maps
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11. 1:24,000 -7.5 minute digital elevation models (DEM) for West 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...
12. 1:250,000 Digital Raster Graphics for Delaware
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...
13. 1:250,000 Digital Raster Graphics for Maryland
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...
14. 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...
15. 1:250,000 Digital Raster Graphics for West 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...
16. Aerial Photography 1996 - Tile Index: Philadephia, Pennsylvania
1996. Philadelphia aerial photography.
17. Aerial Photography 1996: Philadephia, Pennsylvania
1996. Philadelphia aerial photography.
18. Aerial Photography 2000 - Tile Index: Philadephia, Pennsylvania
2000. Philadelphia aerial photography.
19. Aerial Photography 2000: Philadephia, Pennsylvania
2000. Philadelphia aerial photography.
20. Aerial Photography 2004 - Tile Index: Philadephia, Pennsylvania
2004. Philadelphia aerial photography.