www.tccycling.com/reports/tahoe/stanford-paig...DRG is short for Digital Raster Graphic. A DRG is a digital representation of a hard copy USGS Standard Series Topo map. DRG's are sometimes created by scanning the original hard copy map and then georeferencing the image so that it has positional coordinates and can be used in mapping applications. They are also refreshed on an annual basis. The above map is of Auburn state recreation area and is a DRG map.
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