DRG or digital raster graphics is a paper map that is scanned into a computer. Used by the USGS (United States Geological Survey), the uploading of this map makes it easier for cartographers to create a higher resolution map, as well as enhance features. This is a map of Juneau, Alaska that was scanned into a computer.
Direct URL: http://egsc.usgs.gov/isb/pubs/factsheets/fs10602.html
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