Photogrammetric Engineering & Remote Sensing · 1994 · 225 citations · 0 references
ComputingEarth SciencesGeoinformaticsDigital Elevation ModelingRemote SensingTerrain AnalysisMountain TopographyPhotogrammetric Elevation ModelingPhotogrammetric SurveyingPhotogrammetrySlope AnalysisTerrain Surface ModelingDem Accuracy AssessmentDem Quality AssessmentDem Quality ControlDem ValidationDigital Elevation Model GenerationElevation AccuracyElevation Data ProcessingElevation Data Quality Assessment
The accuracy of elevations, slopes, and aspects were evaluated for two DEMs of an area centered on Blacksburg, Virginia, in the southern Appalachian Mountains. The first was a U.S. Geological Survey (USGS) 7.5-minute quadrangle-based DEM with 30-metre postings, produced utilizing automated stereocorrelation of 1:40,000-scale leaf-off aerial photographs with a Gestalt Photomapper (GPM). The second DEM of the same area was produced from a SPOT panchromatic stereopair using a proprietary stereo-correlation technique developed by the STX corporation, among those used by SPOT Image Corp. for high resolution DEM production. DEM accuracy was assessed visually and through comparisons of DEM-derived to field-surveyed values for elevation, slope, and aspect