West Virginia DOQQ
1996-97 color infrared (CIR)
1:12,000; Ground sample distance is 1 meter. photography
1996-97 color infrared (CIR) NAPP photography is the primary image source (refer to header file for actual photo source date). Digital orthophoto quarter-quads meet horizontal National Map Accuracy Standards (NMAS) at 1:12,000 scale (plus or minus 33 feet error). The geographic extent of the DOQ is equivalent to a quarter-quad. Each image also has between 50 and 300 meters of overedge to facilitate tonal matching for mosaicking of adjacent images.
Standard digital orthophotos, 3.75-minute coverage, are cast on the Universal Transverse Mercator (UTM) projection on the North American Datum of 1983 (NAD83) with coordinates in meters.
FILE FORMAT MrSID compressed format.
Download the file and decompress (unzip) it.
For use with ArcView - Both the .sid and the .sdw need to be downloaded to work properly with ArcView. The .dat file is for your reference. Also, you must load the "MrSID Image Support" Extension from the "File>Extensions" menu in order to view these images in ArcView. Free MrSID Viewer/Browser Plug-in - If you don't have the ArcView software, you may download the free MrSID Viewer from the Lizardtech web site. www.lizardtech.com