A digital raster graphic (DRG) is basically a scanned topographic map from the U.S. Geologic Survey. It is then georeferenced to Earth's surface. This particular map is a scanned topographic map (DRG) of Coxville, Texas just outside of Austin.
http://www.tceq.texas.gov/gis/metadata/drg_met.html
No comments:
Post a Comment