A digital raster graphic (DRG) is a digital image resulting from scanning a paper USGS topographic map for use on a computer. DRGs created by USGS are typically scanned at 250 dpi and saved as a TIFF. The raster image usually includes the original border information, referred to as the "map collar". The map file is UTM projected and georeferenced to the surface of the earth. DRG's are regularly used in GIS applications.
Famous quotes containing the word graphic:
“Speed is scarcely the noblest virtue of graphic composition, but it has its curious rewards. There is a sense of getting somewhere fast, which satisfies a native American urge.”
—James Thurber (1894–1961)