Jables' Map Cattle Log
Wednesday, November 13, 2013
DRG (Digital Raster Graphic)
http://www.tceq.texas.gov/gis/drg.html
DRG's are digital raster graphics. They are digital images that are scanned from a U.S. Geological survey topographic map. This DRG shows a section of the Colorado River and its surrounding areas.
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