COMPARISON OF DERIVATIVE TOPOGRAPHIC SURFACES OF A DEM GENERATED FROM STEREOSCOPIC SPOT IMAGES WITH FIELD MEASUREMENTS

A digital elevation model (DEM) derived from SPOT satellite imagery is evaluated for accuracy in elevation and three of its derivative topographic surfaces: slope gradient, incidence value, and profile curvature. In this study, a 20-m resolution grid DEM is generated from stereoscopic SPOT images and used to calculate derivative topographic surfaces. The emphasis of this paper is placed on accuracy evaluation of the derivative measures, not on the DEM creation process. For completeness, the accuracy of the elevation surface is tested with topographic map data. For the derivative surfaces of slope gradient, incidence value, and profile curvature, field measurements are employed in accuracy evaluation. Due to the presence of spatially autocorrelated noise in the raw DEM, various smoothing filters are investigated to increase the correlation between the digital surfaces and the field measurements.

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  • Corporate Authors:

    American Society for Photogrammetry and Remote Sensing

    5410 Grosvenor Lane, Suite 210
    Bethesda, MD  United States  20814-2160
  • Authors:
    • Giles, P T
    • Franklin, S E
  • Publication Date: 1996-10

Language

  • English

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Filing Info

  • Accession Number: 00728865
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 1 1996 12:00AM