Physics – Optics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...50..245h&link_type=abstract
(Workshop on Quasi-Periodic Climatic Changes on Earth and Mars, Moffett Field, CA, Feb. 24-26, 1981.) Icarus, vol. 50, May-June
Physics
Optics
27
Astronomical Photometry, Mars Photographs, Mars Surface, Polar Caps, Topography, Viking Orbiter Spacecraft, Albedo, Error Analysis, Geometrical Optics, Mars Atmosphere, Parameterization, Planetary Mapping, Spectral Reflectance
Scientific paper
Photoclinometry is useful for the determination of topography for areas which have a uniform albedo. The technique is applied to early spring Viking images of the Martian north polar cap, taken when the surface was covered by a nearly uniform frost cover. Unlike earlier approaches, the topographic profiling can be used for surfaces with any photometric function, but the strike of the planetary surface relative to the illumination angle must be specified along the profile. The resultant profiles are relatively insensitive to misestimation of the photometric function and slope orientation, but are quite sensitive to the assumed values of the reflectance of an equivalent level surface and the atmospheric opacity (if it is large).
Blasius Karl R.
Cutts James A. J.
Howard Alan D.
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