|Digital Raster Graphics (DRG)|
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DRGTools - a set of programs for manipulating USGS Digital Raster Graphics (DRG) Topographic Maps.These programs are free software; you can redistribute them and/or modify them under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
Documentation and Tools for Utilizing USGS Digital Raster Graphic Data - The DRG-Tools extension provides tools for edgematching (mosaicking) Digital Raster Graphic (DRG) scanned quad images created by the Teale Data Center (Teale), the Tennessee Valley Authority (TVA), and the United States Geological Survey (USGS). Other utilities are also provided, including options for isolating specific image features such as contours or hydrography.
© Copyright 2007 - Samuel J. Wormley