Mathematics – Logic
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p51d1469s&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P51D-1469
Mathematics
Logic
[5460] Planetary Sciences: Solid Surface Planets / Physical Properties Of Materials, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing, [5470] Planetary Sciences: Solid Surface Planets / Surface Materials And Properties, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
The Mars Exploration Rovers’ traverses present a unique opportunity for comparing ground truth to orbital data. The Opportunity rover has traveled over 22 km in Meridiani Planum, investigating a variety of surface units, including bedrock, several types of ripple units, and crater ejecta units. During its traverse, Opportunity has been gathering direct information on soil chemistry, mineralogy, grain sizes, and geologic context. The Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on the Mars Reconnaissance Orbiter (MRO) has taken ten Full Resolution Targeted (FRT) observations over Opportunity’s traverse (FRTs include frames taken at varying gimbal angles). This hyperspectral orbital data can be used to further characterize regions of interest through comparison with specific locations along Opportunity’s traverse. As a first step toward this goal, we present average Hapke parameters (using the Hapke Model with a one-term Henyey-Greenstein function) of the surface traversed by Opportunity. These include the single scattering albedo (w= 0.47 ± 0.05 at 0.8 micrometers) of the surface and the asymmetry parameter (b= -0.26 ± 0.05 at 0.8 micrometers; moderately backscattering) of its phase function. CRISM data are a combination of surface and atmospheric contributions. We isolate the contribution from the surface by using Discrete Ordinates Radiative Transfer (DISORT) to atmospherically correct CRISM data. Part of this process uses CRISM-derived wavelength-dependent phase functions for dust provided by Michael Wolff and optical depth values obtained from the Panoramic Camera (Pancam) on Opportunity. We then used least squares fitting on the atmospherically corrected data to obtain the best fit for bidirectional reflectance. We test the entire parameter space for local minima in χ2 and determine which of these is the global minimum. Results are comparable to those obtained from a direct analysis of Pancam data collected on a smaller spatial scale and analyzed by other workers. Given the self-consistent photometric models from CRISM and Pancam, we are now pursuing and will present retrievals of parameters for the full CRISM spectral range from 0.4 to 4.0 µm. Having similar datasets yielding comparable results from ground and orbital platforms allows the use of these parameters for comparative purposes, and further allows for the extension of the findings of the full suite of rover instruments to nearby regions covered by CRISM.
Arvidson Ray E.
Cull Selby
Seelos Frank P.
Shaw Amy
Wiseman Sandra Margot
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