What is a digital raster graphic (DRG)? <!-- topographic map, geospatial data -->
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USGS Frequently Asked Questions

Question: What is a digital raster graphic (DRG)?

Answer:

A 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.

DRG Fact Sheet

Source of this FAQ:
http://erg.usgs.gov/isb/pubs/factsheets/fs08801.html

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