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Proceedings Paper

Spectral invariance hypothesis study of polarized reflectance with Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI)
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Paper Abstract

Many models used to represent the boundary condition for the separation of atmospheric scattering from the surface reflectance in polarized remote sensing measurements assume that the polarized surface reflectance is spectrally neutral. The Spectral Invariance Hypothesis asserts that the magnitude and shape of the polarized bidirectional reflectance factor (pBRF) is equal for all wavelengths. In order to test this hypothesis, JPL's Ground-based Multiangle SpectroPolarimetric Imager (GroundMSPI) is used to measure polarization information of different outdoor surface types. GroundMSPI measures the linear polarization Stokes parameters (I, Q, U), at three wavelengths, 470 nm, 660 nm, and 865 nm. The camera is mounted on a two-axis gimbal to accurately select the view azimuth and elevation directions. On clear sky days we acquired day-long scans of scenes that contain various surface types such as grass, dirt, cement, brick, and asphalt and placed a Spectralon panel in the camera field of view to provide a reflectance reference. Over the course of each day, changing solar position in the sky provides a large range of scattering angles for this study. The polarized bidirectional reflectance factor (pBRF) is measured for the three wavelengths and the best fit slope of the spectral correlation is reported. This work reports the range of best fit slopes measured for five region types.

Paper Details

Date Published: 1 September 2015
PDF: 9 pages
Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130U (1 September 2015); doi: 10.1117/12.2187495
Show Author Affiliations
Christine L. Bradley, College of Optical Sciences, The Univ. of Arizona (United States)
Meredith Kupinski, College of Optical Sciences, The Univ. of Arizona (United States)
David J. Diner, Jet Propulsion Lab. (United States)
Feng Xu, Jet Propulsion Lab. (United States)
Russell A. 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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