Index Value Plot is an illustration viewing values and recording them against time to show fluctuations or change in the variable.
Showing posts with label U.S. Department of the Interior - U.S. Geological Survey. Show all posts
Showing posts with label U.S. Department of the Interior - U.S. Geological Survey. Show all posts
Wednesday, July 30, 2008
Monday, July 28, 2008
DRG - Digital Raster Graphic
A digital raster graphic (DRG) is a scanned image of a U.S. Geological Survey (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 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.
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