USGS Standards for Digital Raster Graphics, version 2. The links below are from the Internet Archive. The data in this service is sourced from the U.S. A digital raster graphic ( DRG) is a digital image resulting from scanning a paper USGS topographic map for use on a computer. Format specifications The specification of the DRG format is no longer available from the USGS or the National Map website. Check the information on the original source images for a possible revision date. The date of the scanned map from the original source metadata is included as a footprint attribute. The collar information may be accessed by downloading an original source image. The collar information has been suppressed to enable a seamless statewide image. C5 China, multiple scales Collaboratory has 143 files. B7 Brazil, 1:100,000 Collaboratory has 46 files. Listed below is a short list of a few datasets which are particularly complete (ie: cover most of the country): 4450s 100. This collection includes 2296 1:24,000-scale maps. DRG Datasets The DREAM Lab has a collection of digital raster graphic (DRG) datasets that are ready to use in a GIS. The original Digital Raster Graphic (DRG) is a raster image of a scanned U.S.Geological Survey (USGS) topographic map including the collar information, georeferenced to the UTM grid.
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