http://images.google.com/imgres?imgurl=http://edc.usgs.gov/images/drg_250_ex.jpg&imgrefurl=http://edc.usgs.gov/products/map/drg.html&h=503&w=648&sz=176&hl=en&start=7&tbnid=ibK8sAJ2PTgLTM:&tbnh=106&tbnw=137&prev=/images%3Fq%3DDRG%26gbv%3D2%26hl%3DenThe above image is a DRG (Digital Raster Graphic) map of Hartford, CT. A DRG is typically a digital image that is scanned on a paper of the USGS topographic map for the use on a computer and includes the original border information of the area.
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