Digital Raster Graphic (DRG) |
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A Digital Raster Graphic (DRG) is a digital image (scanned version) of a USGS topographic map. DRGs are produced from USGS 1:24,000-, 1:24,000/1:25,000-, 1:63,360- (Alaska), 1:100,000-, and 1:250,000-scale topographic map series. The image inside the map neatline is georeferenced to the surface of the Earth and fit to the Universal Transverse Mercator (UTM) projection. The horizontal positional accuracy and datum of the DRG matches the accuracy and datum of the source map. DRGs for Lake Tahoe are available here as TIFF and MrSID images of USGS
7.5-minute topographic maps, along with its associated world file in text.
The world file can be used by some software to place the DRGs in digital
space. DRGs in MrSID format can be viewed with MrSID viewers from For more information about DRGs, please visit DRG Download
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U.S. Department of the Interior
|| U.S. Geological Survey
|| National Mapping Information
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