Mathematics – Logic
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...25..613w&link_type=abstract
Icarus, vol. 25, Aug. 1975, p. 613-626. Research supported by the U.S. Geological Survey and NASA.
Mathematics
Logic
9
Astronomical Photography, Mariner 9 Space Probe, Mars Surface, Topography, Astronomical Photometry, Finite Difference Theory, Light Scattering, Optical Thickness, Planetary Mapping, Spaceborne Photography
Scientific paper
A theory is developed for the photoclinometric determination of topography when the photometric function of a planetary surface is not restricted beyond the expectation that it is a function of phase angle, angle of incidence, and angle of emergence. Several versions of such an operational theory are presented together with several approaches to the numerical analysis. Reasons for the differences in numerical techniques are discussed. A preliminary result is considered which has been produced for an early Mariner 9 frame wherein the dust-laden atmosphere seems to exhibit standing-wave patterns. It is shown that if the assumption of homologous departures from plane-parallel atmospheric configuration is valid, the photoclinometry implies that laminar flow lines in the optically observable dust layer undergo a near-sinusoidal rise and fall of about 40 to 50 meters.
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