Sunday, May 25, 2008

DRG

www.forestpal.com/images/drg.gif
DRG maps are digital raster graphics. They are scanned images of a U.S. Geological Survey standard series topographic map. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator projection. The map is scanned at a minimum resolution of 250 dots per inch.

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