http://images.google.com/imgres?imgurl=http://www.pasda.psu.edu/tutorials/arcgis/images/drg.jpg&imgrefurl=http://www.pasda.psu.edu/tutorials/arcgis/drg.asp&usg=__7KzpwdcA9tkISEzsZVyptfNhB6E=&h=619&w=800&sz=692&hl=en&start=18&um=1&tbnid=PfYmaS9k6hnf4M:&tbnh=111&tbnw=143&prev=/images%3Fq%3Ddigital%2Braster%2Bgraphic%26ndsp%3D18%26hl%3Den%26client%3Dsafari%26rls%3Den%26sa%3DX%26um%3D1
The DRG uses a scanned image from the USGS standard series topographic map. It uses a UTM projection and georeferences the Earth.
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