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What is a Digital Raster Graphic (DRG)?

April 26, 2017digital DRG graphic raster

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What is a Digital Raster Graphic (DRG)?

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A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. The scanned image includes all map collar information. The image inside the map neatline is georeferenced to the surface of the Earth. The DRG can be used to collect, review, and revise other digital data, especially digital line graphs (DLG). When the DRG is combined with other digital products, such as digital orthophoto quadrangles (DOQ) or digital elevation models (DEM), the resulting image provides additional visual detail for the extraction and revision of base cartographic information.