A digital raster graphics map, also known as a DRG map, consists of scanned images of U.S. Geological Survey topographic maps. These scanned image can be used to collect, review, and revise other digital data (http://images.google.com/imgres?imgurl=http://www.tceq.state.tx.us/assets/public/gis/images/drg.gif&imgrefurl=http://www.tceq.state.tx.us/gis/drg.html&usg=__qxjL45cP4iIaG2I7U_tRa1wO3Vs=&h=556&w=607&sz=97&hl=en&start=4&um=1&tbnid=XTr5fV2kfCeExM:&tbnh=125&tbnw=136&prev=/images%3Fq%3DDRG%2Bmap%26um%3D1%26hl%3Den%26rlz%3D1T4GPEA_enUS297US302%26sa%3DN).
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