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

Meredith Kupinski; Christine Bradley; David Diner; Feng Xu; Russell Chipman

doi:10.1117/12.2188207

1 September 2015 Applying a microfacet model to polarized light scattering measurements of the Earth's surface

Meredith Kupinski, Christine Bradley, David Diner, Feng Xu, Russell Chipman

Proceedings Volume 9613, Polarization Science and Remote Sensing VII; 96130T (2015) https://doi.org/10.1117/12.2188207
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

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.

Citation Download Citation

Meredith Kupinski, Christine Bradley, David Diner, Feng Xu, and Russell Chipman "Applying a microfacet model to polarized light scattering measurements of the Earth's surface", Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130T (1 September 2015); https://doi.org/10.1117/12.2188207

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