Characterization of sun and sky glint from wind ruffled sea surfaces for improved estimation of polarized remote sensing reflectance

Robert Foster; Amir Ibrahim; Alex Gilerson; Ahmed El-Habashi; Carlos Carrizo; Sam Ahmed

doi:10.1117/12.2190652

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1 September 2015 Characterization of sun and sky glint from wind ruffled sea surfaces for improved estimation of polarized remote sensing reflectance

Robert Foster, Amir Ibrahim, Alex Gilerson, Ahmed El-Habashi, Carlos Carrizo, Sam Ahmed

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Proceedings Volume 9613, Polarization Science and Remote Sensing VII; 96130W (2015) https://doi.org/10.1117/12.2190652
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

During two cruises in 2014, the polarized radiance of the ocean and the sky were continuously acquired using a HyperSAS-POL system. The system consists of seven hyperspectral radiometric sensors, three of which (one unpolarized and two polarized) look at the water and similarly three at the sky. The system autonomously tracks the Sun position and the heading of the research vessel to which it is attached in order to maintain a fixed relative azimuth angle with respect to the Sun (i.e. 90°) and therefore avoid the specular reflection of the sunlight. For the duration of both cruises, (NASA Ship Aircraft Bio-Optical Research (SABOR), and NOAA VIIRS Validation/Calibration), in situ inherent optical properties (IOPs) were continuously acquired using a set of instrument packages modified for underway measurement, and hyperspectral radiometric measurements were taken manually at all stations. During SABOR, an underwater polarimeter was deployed when conditions permitted. All measurements were combined in an effort to first develop a glint (sky + Sun) correction scheme for the upwelling polarized signal from a wind driven ocean surface and compare with one assuming that the ocean surface is flat.

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Robert Foster, Amir Ibrahim, Alex Gilerson, Ahmed El-Habashi, Carlos Carrizo, and Sam Ahmed "Characterization of sun and sky glint from wind ruffled sea surfaces for improved estimation of polarized remote sensing reflectance", Proc. SPIE 9613, Polarization Science and Remote Sensing VII, 96130W (1 September 2015); https://doi.org/10.1117/12.2190652

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