Vydavatel National Park Service, Department of the Interior
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Color aerial photography was collected, in stereo with 60 percent forward overlap and 40 percent side overlap on 6-27-02. The flight height was 20,000 feet above mean terrain. Airborne GPS data were collected. The original film was scanned at 21 microns to create pixels of approximately .84 meters. USGS National Elevation Dataset (NED) grid date was used to create digital orthophotos.