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

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

Answer:

DRGs are scanned at 250 dots/inch (dpi). At this resolution, file sizes range between 8 and 10 megabytes (mb) for the 7.5-minute quadrangles.

Source of this FAQ:
http://mcmcweb.er.usgs.gov/gcras/digfaq.html

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