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The following are the products that we use in the mapmaking process.

Topographic Maps (paper)

USGS primary series topographic quadrangle maps (7.5 minute - 1:24,000, 1:25,000, 1:20,000; 7.5 x 15 minute - 1:25,000; and 1:63,360 scales)

Topographic Maps (DRG)

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.  If needed, we remove the collar information and mosaic (make seamless) all DRG's used.

Digital Orthophoto Quadrangle (DOQ)

A digital orthophoto quadrangle (DOQ) is a computer-generated image of an aerial photograph that has been orthorectified -- altered so that it has the geometric properties of a map.  If needed, we mosaic (make seamless) all DOQ's used.

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Last modified: June 27, 2013