An instrument, the Zoom Height Finder, has been developed to investigate the possibilities of economically deriving height information from satellite images. Measurements of several stereopairs of Skylab photographs produced on color, color-infrared, and panchromatic films, and of overlapping Ladsat images recorded on successive orbits resulted in minimum height difference errors or plus or minus 50 to plus or minus 300 m and absolue elevation RMSE's of plus minus 150 to greater than plus or minus 300 m. Base-height ratios varied from 0.10 to 0.26, and the precision of stereometer measurements ranged from approximately plus or minus 3 to plus or minus 8 mu m depending on the viewing magnification employed and the resolution (R) of the images. From these measurements to optimum viewing magnification was determined to be equivalent to 0.7R + 7. Improved b/h ratios and lower altitudes are required to obtain significant improvements in heighting accuracies. /Author/

  • Availability:
  • Supplemental Notes:
    • Presented at the 42nd Annual Meeting of the American Society of Photogrammetry, Washington, D.C, February, 1976.
  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Welch, R
    • Lo, C P
  • Publication Date: 1977-10

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00167901
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 16 1978 12:00AM