Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pgers..45.1083l&link_type=abstract
Photogrammetric Engineering and Remote Sensing, vol. 45, Aug. 1979, p. 1083-1096.
Physics
3
Aerial Photography, Error Analysis, Image Processing, Radar Photography, Side-Looking Radar, Stereophotography, Photogrammetry, Photointerpretation, Photomapping, Projective Geometry, Radar Imagery
Scientific paper
Basic facts regarding stereo side-looking radar are reviewed and illustrated both for aircraft and spacecraft radar configurations. An evaluation is made of visual stereo geometry and stereo model accuracy, and formulas are reviewed or derived. Attention is given to the concept of vertical exaggeration in order to evaluate the quality of radar stereo. As an example, it is noted that optimum aircraft stereo offers an exaggeration factor of about 2 while a Venus Orbital Imaging Radar offers a factor of only 0.6. A differentiation is made between errors of coordinates (absolute accuracy) and of distances and height differences (relative errors). In addition it is shown that these (relative) errors of coordinate differences are much less sensitive to an erroneous stereo base or flight height than is the case with errors in the coordinates themselves. Finally, while indications exist that look angles should be not less than 40 deg off-nadir, with intersection angles of about 15 deg, more study is needed in this area.
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