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Proceedings Paper

Applying a microfacet model to polarized light scattering measurements of the Earth's surface
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Paper Abstract

Representative examples from three-years of measurements from JPL's Ground-based Multiangle SpectroPolarimetric Imager (Ground-MSPI)[1] are compared to a model for the surface polarized bidirectional reflectance distribution matrix (BRDM). Ground-MSPI is an eight-band spectropolarimetric camera mounted on a rotating gimbal to acquire push-broom imagery of outdoor landscapes. The camera uses a photoelastic-modulator-based polarimetric imaging technique to measure linear Stokes parameters in three wavebands (470, 660, and 865 nm) with a ±0.005 uncertainty in degree of linear polarization (DoLP). Comparisons between MSPI measurements, BRDM models, and common modifications to the model are made over a range of scattering angles determined from a fixed viewing geometry and varying sun positions over time. The BRDM model is comprised of a volumetric reflection term plus a specular reflection term of Fresnel-reflecting micro-facets. We consider modifications to this model using a shadowing function and two different micro-facet scattering density functions. We report the root-mean-square error (RMSE) between the Ground-MSPI measurements and BRDM model. The BRDM model predicts an angle of the linear polarization (AoLP) that is perpendicular to the scattering plane. This is usually, but not always, observed in Ground-MSPI measurements and in this work we offer explanations for some of the deviations from the model.

Paper Details

Date Published: 1 September 2015
PDF: 11 pages
Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130T (1 September 2015); doi: 10.1117/12.2188207
Show Author Affiliations
Meredith Kupinski, College of Optical Sciences, The Univ. of Arizona (United States)
Christine Bradley, College of Optical Sciences, The Univ. of Arizona (United States)
David Diner, Jet Propulsion Lab. (United States)
Feng Xu, Jet Propulsion Lab. (United States)
Russell Chipman, College of Optical Sciences, The Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 9613:
Polarization Science and Remote Sensing VII
Joseph A. Shaw; Daniel A. LeMaster, Editor(s)

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