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USGS Digital Raster Graphics

USGS Digital Raster Graphics

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USGS Digital Data Viewing Software
Digital Raster Graphics
7.5-minute Digital Raster Graphic

What is a Digital Raster Graphic?

A 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.

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Page Last Modified: Friday, 16-Dec-2016 10:44:50 EST