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Enhanced (collarless) digital raster graphics (DRG) Projection: UTM DATUM: NAD83 (WGS84 for the US Territories) A standard digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) standard series topographic map, including all map collar information. The image inside the map neatline is georeferenced to the surface of the earth and fit to the Universal Transverse Mercator projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. The map is scanned at a minimum resolution of 250 dots per inch. These enhanced DRGs have the collars removed. The removal of the collar information allows the Enhanced DRGs to be edge-matched and displayed simultaneously in a Geographic Information System. |
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