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Sensitivity of the above water polarized reflectance to the water compositionFormat | Member Price | Non-Member Price |
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Paper Abstract
Estimating the Stokes vector components of the polarized water radiance from above water measurements is a
challenging task, mainly because of their small magnitude and the strong contamination by the sky light reflected on
the sea surface. Consequently, in most applications the Stokes vector components are considered equal to zero
except of I, the total reflectance. In this study, both below and above water measurements are used to assess the
feasibility of such retrievals and their use to determine the water composition. In-water inherent optical properties
(IOPs) were measured with commercially available instrumentation. In addition, in-water polarization characteristics
were measured by our multi-angular hyperspectral sensor which provided the Stokes components for a scattering
angles range of the 0-180° and a full spectral range between 400 and 750 nm. Second, a customized HyperSAS
(Satlantic) instrument is used from the coastal platform in Long Island Sound, NY (LISCO) acquiring above water
measurements. That instrumentation includes, in the standard configuration, two hyperspectral radiance sensors for
measuring upwelling and sky radiances and one irradiance sensor for measuring downwelling irradiance. In our
installation, HyperSAS capabilities were augmented by adding two radiance sensors having two polarizers oriented
at 0 and 45°, with respect to a reference axis ("HyperSAS-POL"). An ad hoc procedure, which included measurements and radiative transfer computations, has been developed enabling to estimate the contribution of the sky glint and subtract it from the signal directly measured by HyperSAS-POL. As a result, the retrieved spectral shape of the underwater degree of polarization is consistent with what obtained from in situ underwater measurements and depends on the IOPs of the ocean itself. In addition, the demonstrated correctness of this polarized measurements from LISCO site enable us to provide continuous time series from the beginning of June 2010.
Paper Details
Date Published: 18 October 2010
PDF: 10 pages
Proc. SPIE 7825, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010, 78250F (18 October 2010); doi: 10.1117/12.865510
Published in SPIE Proceedings Vol. 7825:
Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010
Charles R. Bostater; Stelios P. Mertikas; Xavier Neyt; Miguel Velez-Reyes, Editor(s)
PDF: 10 pages
Proc. SPIE 7825, Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010, 78250F (18 October 2010); doi: 10.1117/12.865510
Show Author Affiliations
A. Tonizzo, CUNY (United States)
T. Harmel, CUNY (United States)
A. Ibrahim, CUNY (United States)
S. Hlaing, CUNY (United States)
I. Ioannou, CUNY (United States)
T. Harmel, CUNY (United States)
A. Ibrahim, CUNY (United States)
S. Hlaing, CUNY (United States)
I. Ioannou, CUNY (United States)
A. Gilerson, CUNY (United States)
J. Chowdhary, Columbia Univ. (United States)
B. Gross, CUNY (United States)
F. Moshary, CUNY (United States)
S. Ahmed, CUNY (United States)
J. Chowdhary, Columbia Univ. (United States)
B. Gross, CUNY (United States)
F. Moshary, CUNY (United States)
S. Ahmed, CUNY (United States)
Published in SPIE Proceedings Vol. 7825:
Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010
Charles R. Bostater; Stelios P. Mertikas; Xavier Neyt; Miguel Velez-Reyes, Editor(s)
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