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Earth Resources Observation and Science (EROS) |
Digital Raster Graphics (DRGs)
Contents: | 1:24,000 Scale DRG |
1:250,000 Scale DRG |
Product DescriptionA Digital Raster Graphic (DRG) is a scanned image of a 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 (UTM) 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. DRGs have been made for all quadrangles in the USGS standard topographic map series for the United States, its territories and trusts. Source maps include:
See the DRG status graphic for approximate areas of coverage. The technical specifications for DRGs from these sources differ slightly from USGS specifications. DRGs are in TIFF 6.0 and use GeoTIFF 0.2 specifications to define a set of TIFF tags. These tags describe all cartographic information associated with the file. The average file size is 10 megabytes. Current DRGs are available as a seamless product which can be downloaded at no cost from Seamless. The DRGs are collarless and available for most of the conterminous United States. Additional Information: Back to TopDownload at No Cost
Back to TopSample DataA sample 1:24,000-Scale DRG can be downloaded from USGS Geographic Data Download. Back to Top |
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