Testing Planetary Radiative Transfer Models via Remote Sensing of Gypsum Sands in White Sands National Monument

Details Testing Planetary Radiative Transfer Models via Remote Sensing of Gypsum Sands in White Sands National Monument Testing Planetary Radiative Transfer Models via Remote Sensing of Gypsum Sands in White Sands National Monument

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p53a1491s&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P53A-1491

Statistics

Computation

[5460] Planetary Sciences: Solid Surface Planets / Physical Properties Of Materials, [5464] Planetary Sciences: Solid Surface Planets / Remote Sensing

Scientific paper

Directional reflectance and emission spectra for particulate materials are governed by the mineralogy, grain size, packing, and topography of the sample observed. White Sands National Monument, as the largest homogeneous gypsum dune field in the world, provides a unique in-situ environment in which to isolate the textural components of spectra and determine the ability of remote sensing models to retrieve material properties. In this study, a traverse between two interdune regions across a transverse-barchan dune was conducted in August 2010 and detailed spectral field measurements ranging from 0.4 to 20 µm were taken at 17 sites along the traverse. These field measurements were used to calibrate the test the ability of three radiative transfer models to retrieve material properties. Specifically, the Shkuratov (1999) model assumes that incidence, emergence, and phase angles can be integrated over their elevation and azimuthal ranges and that the surface can be modeled as layered mineral slabs. The Hapke model uses directional information, but makes simplifying assumptions about the nature of scattering in particulate material (Hapke, 1993 and follow-on papers). Mishchenko (2008) models Maxwell’s equations rigorously for particulate surfaces as distributed dipoles, but is computationally intensive. A subset of the field sites’ textural characteristics were carefully measured and used to calibrate the models to match laboratory gypsum spectra. The remaining field sites were used as blind samples to test the ability of the models to retrieve gypsum material properties without detailed textural measurements. These data improve understanding of the benefits and limitations of available radiative transfer models to better understand similar data retrieved from planetary surface observations, including observations covering a similar gypsum dune field near the north pole of Mars and ripples currently being crossed by the Opportunity rover.

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