Multi- and hyperspectral polarimetric imaging of the ocean surface

Alex Gilerson; Carlos Carrizo; Mateusz Malinowski; Philipp Groetsch; Robert Foster; Eder Herrera Estrella

doi:10.1117/12.2534055

14 October 2019 Multi- and hyperspectral polarimetric imaging of the ocean surface

Alex Gilerson, Carlos Carrizo, Mateusz Malinowski, Philipp Groetsch, Robert Foster, Eder Herrera Estrella

Proceedings Volume 11150, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019; 1115007 (2019) https://doi.org/10.1117/12.2534055
Event: SPIE Remote Sensing, 2019, Strasbourg, France

Abstract

A novel polarization camera (Teledyne DALSA) based on the Sony first polarization imaging sensor provides a high resolution broadband image of the object in 400-900 nm spectral range, where each pixel contains four subpixels bearing built-in linear polarizers oriented at the 0, 45, 90 and -45 degrees. With an additional lens it has a field of view (FOV) of about 40° degrees. The camera was equipped with a filter wheel containing five band-pass filters, thus providing multispectral, multi-angular high quality polarimetric data with high spatial resolution. The camera has undergone radiometric calibration and was used in various illumination conditions and water environments in NYC area. Spatial and temporal distribution of water and sky Stokes vector components were characterized at various wind speeds. Polarization images were also used for the estimation of wave slope statistics from the ocean surface. Results are compared with concurrent measurements of total and polarized radiances by a state-of-the-art snapshot hyperspectral imager, which simultaneously acquires spectra with 4 nm spectral resolution in the wavelength range of 450- 750nm, also with a 40° FOV for 20 - 60° viewing angles. A computer-controlled filter wheel was installed in front of the imager, allowing division-of-time Stokes vector images from the ocean surface. The combination of these two instruments allows to observe spectral and polarization properties of the wind-roughened ocean at high spatial and temporal resolution, with the goal of advancing our understanding of the air-water interface and in-water light propagation.

Conference Presentation

Citation Download Citation

Alex Gilerson, Carlos Carrizo, Mateusz Malinowski, Philipp Groetsch, Robert Foster, and Eder Herrera Estrella "Multi- and hyperspectral polarimetric imaging of the ocean surface", Proc. SPIE 11150, Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019, 1115007 (14 October 2019); https://doi.org/10.1117/12.2534055

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