A United States Geological Survey Digital Raster Graphic (DRG) image of the Michigan coastline. DRGs are digitally scanned versions of physical USGS topographic maps that include original boundary information ("map collars").
Taken from HERE.
Showing posts with label DRG. Show all posts
Showing posts with label DRG. Show all posts
Thursday, August 7, 2008
DRG
A United States Geological Survey Digital Raster Graphic (DRG) image of the Michigan coastline. DRGs are digitally scanned versions of physical USGS topographic maps that include original boundary information ("map collars").
Taken from HERE.
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