Center for Spatial Analysis Technologies

Digital Raster Graphics for Georgia - Definition

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.

[back]

Back to Main DRG Page
Return to CSAT Home Page

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://csat.er.usgs.gov/drg/definition.html
Page Contact Information: webmaster-ga@usgs.gov
Page Last Modified: Thursday, 18-May-2006 10:24:51 EDT