Optical scattering properties of terrestrial varnished basalts compared with rocks and soils at the Viking Lander sites

Details Optical scattering properties of terrestrial varnished basalts compared with rocks and soils at the Viking Lander sites Optical scattering properties of terrestrial varnished basalts compared with rocks and soils at the Viking Lander sites

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..491g&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 491.

Other

Basalt, Optical Properties, Viking Lander Spacecraft, Earth Surface, Rocks, Volcanoes, Iron Oxides, Bidirectional Reflectance, Light Scattering, Specular Reflection, Surface Roughness, Minerals

Scientific paper

Measurements of bidirectional reflectance (red wavelength) as a function of incidence and emission angle were made along the principal plane for basalt samples from the Pisgah Volcanic Field, CA. Data were collected for a varnished surface, a surface coated with a ferric-oxide-rich coating, and a freshly cut surface. Data were fitted with a scattering function that includes specular reflections from rough surfaces and volume penetration and reflection. Model results are consistent with optical properties of the minerals present and the textural configurations, including the presence of discrete grains in the varnish and measured surface tilt distributions. Application of the model to atmospherically corrected Viking Lander images shows that rocks at the two landing sites have similar scattering properties. The rocks are smoother than the soils and have single-particle phase functions and opposition-effect heights consistent with the presence of varnish-like coatings. The Mars Pathfinder IMP system is predicted to find rocks with similar properties at Ares Vallis.

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