Theoretical aspects of photoclinometric terrain profiling on the Galilean satellites

Details Theoretical aspects of photoclinometric terrain profiling on the Galilean satellites Theoretical aspects of photoclinometric terrain profiling on the Galilean satellites

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pggp.rept...27w&link_type=abstract

In NASA. Washington Repts. of Planetary Geol. Program p 27-28 (SEE N84-23431 13-91)

Physics

Galilean Satellites, Photometers, Shadows, Surface Properties, Topography, Albedo, Brightness Distribution, Craters, Goodness Of Fit, Light Scattering, Terrain

Scientific paper

For large parts of the surfaces of the Galilean satellites there is no stereoscopic high resolution imagery, and so for shadow-free regions far from the terminator, the only method of obtaining topograpic information is photoclinometry, the technique of converting brightness variations into local surface tilts and hence into topographic profiles and contour maps. The conversion from brightness changes to slopes require knowledge of the angular photometric function for the type of planetary surface terrain being analyzed, i.e., the relationship describing the brightness of the surface as a function of the angles of incidence (I) and emergence (E) of light at a surface element. In order to investigate the effects of these changes on the shapes of topographic profiles deduced from the functions, an area of grooved terrain (lines 500-505, samples 550-650 on frame 20640.27 0060J2) using wide ranges of values of all the adjustable parameters in Hapke's new photometric function were analyzed.

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