光谱学与光谱分析 |
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Simulation and Analysis of Polarization Characteristics for Real Sea Surface Sunglint |
CHEN Xing-feng1, 2, 3, GU Xing-fa1, 2, 3, 4*, CHENG Tian-hai1, 2, 3, LI Zheng-qiang1, 2, 4, YU Tao1, 2, 3, XIE Dong-hai1, 2, 3 |
1. State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3. Demonstration Center of Spaceborne Remote Sensing, National Space Administration, Beijing 100101, China 4. State Environmental Protection Key Laboratory of Satellites Remote Sensing Applications, Beijing 100101, China |
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Abstract The sea surface sunglint is caused by specular reflectance. Water is a kind of dark target with a very low reflectance, so sunglint becomes a big noise in the aerial or aerospace remote sensing images; sunglint is strongly polarized, and can be a natural standard light source for polarized sensor in-flight calibration; sunglint also can be utilized to retrieve gaseous constituents and aerosol properties. For both de-noising and being standard light source, the radiative physic parameters should be calculated accurately. First, A 3-D sea surface model was constituted according to the Cox & Munk model; Second, the polarized radiative model of sunglint was deduced based on the 3-D sea surface model and polarized Fresnel reflectance law; Third, the sensitivities of solar-viewing relative azimuth, zenith, wind speed and wind direction were analyzed utilizing the polarized radiative model. The polarization characteristics analysis of sunglint provides a theoretical basis for the quantitative remote sensing retrievals which uses sunglint.
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Received: 2010-07-18
Accepted: 2010-10-18
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Corresponding Authors:
GU Xing-fa
E-mail: xfgu@irsa.ac.cn
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