Geospatial Data - 25 of 31
Geospatial Data FAQs - 31 Found
What is a digital raster graphic (DRG)?
A USGS Digital Raster Graphic (DRG) is a scanned image of a U.S. Geological Survey (USGS) topographic map. The term refers to products created in the period 1995-2000 that conform to a specific technical standard. This product series is now inactive, replaced by the Historical Topographic Map Collection (HTMC), which includes more maps scanned at higher resolution and to different technical specifications. HTMC FAQs.
Information about the old DRGs is still posted here, but this web site is unmaintained and is for historical reference only. The USGS no longer distributes DRGs, though the products and various derivatives are easy to find on non-USGS web sites.