Digital Raster Graphics (DRGs) are scanned images from U.S. Geological Survey (USGS) topographic maps that has all map collar information. The image of the map neatline is georeferenced to the surface of the earth and projected to the Universal Transverse Mercator (UTM). This specific map is a part of Washington West, D.C. DRG, a useful backdrop for other digital data to be overlaid. For example, in combination with DOQs and DRGs, the hybrid product can create digital elevation models.
No comments:
Post a Comment