Maps and GIS

Virginia digital raster graphics (DRG) data 1:24,000 scale topographic maps

These files are accessible only to Va Tech students, faculty and staff for non-commercial purposes. They can only be accessed from on the campus. Alternative sites for obtaining Va. Digital Topographic maps can be found here.

Summary

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 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. Read the full USGS description online. Dates for all the DRG's at this site is included in the Alphabetical List of the 1:24,000 Quads.

Data made available by the Virginia Dept of Mines Minerals and Energy.

The following DRG Data files are available from the Reference Dept.'s GIS server:

Please read the "Introduction, including a Disclaimer" before downloading any files.

DRG Tiff images

• Virginia Coverages Index Map
• Alphabetical List of the 1:24,000 Quads
• Instructions and documentation for downloading and viewing the DRG data files