Determining the horizontal ground distance between two points oriented at an angle on slant-range radar imagery requires several steps involving conversion of the slant-range component to a component in the horizontal plane, as well as applying the scale reciprocals to determine the values of the along-track and range components in terms of ground distance. Once these ground components have been calculated from the image measurements, then the resultant straight-line ground distance between the two points can be determined. A derivation with a nomograph reduces all the necessary conversion steps into one simple operation of merely multiplying the slant-range image measurement by a scale reciprocal selected from the nomograph to determine the ground distance between any two points oriented at any angle across the slant-range image, as a function of radar depression angle. The nomograph can easily be used for any imagery scale, and as such is a convenient timesaver for image analysts and interpreters. /Author/

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  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Greer, J D
  • Publication Date: 1975-8

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Filing Info

  • Accession Number: 00125371
  • Record Type: Publication
  • Contract Numbers: NAS 5-21822
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM