DRG

This image is a DRG (Digital Roaster Graphics) of a region of the state of Texas . DRG's are uses

topographic maps and their images are taken from the United States Geographical survey. DRG is georefrenced to the surface of the earth which means it contains geographic cordinates or UTM. Image found in :http://http://www.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=0&sig2=Hb4cAPK8Cp0_-kY-vubczw&tbnid=XTr5fV2kfCeExM:&tbnh=151&tbnw=156&ei=bXFSTJytE4HGlQfWso3EBA&prev=/images%3Fq%3Ddrg%2Bmap%26hl%3Den%26sa%3DG%26biw%3D1276%26bih%3D579%26gbv%3D2%26tbs%3Disch:1&itbs=1&iact=hc&vpx=304&vpy=213&dur=1921&hovh=215&hovw=235&tx=104&ty=99&page=1&ndsp=12&ved=1t:429,r:1,s:0