| 基于偏振原理的水面反射光的剥离 |
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| 引用本文： | 周冠华,赵永超,耿修瑞,李小文.基于偏振原理的水面反射光的剥离[J].水科学进展,2007,18(5):762-767. |
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| 作者姓名： | 周冠华 赵永超 耿修瑞 李小文 |
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| 作者单位： | 1.中国科学院遥感应用研究所, 遥感科学国家重点实验室, 北京, 100101; |
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| 基金项目： | 中国科学知识创新工程重要方向资助项目;国家自然科学基金 |
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| 摘 要： | 水面的镜面反射是影响水环境遥感的关键因素之一。通过分析气-水界面反射光的偏振特性,从多角度偏振遥感的角度,提出一种剥离水面反射光的方法,并通过室内实验进行了验证。将ASD光谱仪与线偏振片结合扩展成高光谱偏振传感器,获取不同观测天顶角时水面反射光的偏振光谱。结果表明,当探测角不满足布儒斯特角时,在偏振片的主消光方向能剥离绝大部分的水面反射光;当入射角越接近布儒斯特角,其剥离效果越佳;以布儒斯特角观测时,可以达到完全剥离的效果。即该方法能显著削弱、甚至完全剥离水面的反射光,直接获取离水辐亮度,对于提高水色遥感的精度有着重要的应用价值。
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| 关 键 词： | 水色遥感 偏振原理 气-水界面 水面反射光 剥离 |
| 文章编号： | 1001-6791（2007）05-0762-06 |
| 收稿时间： | 2005-11-25 |
| 修稿时间： | 2006-10-08 |
Correction of skyglint above water surface based on polarized principle |
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| ZHOU Guan-hua,ZHAO Yong-chao,GENG Xiu-rui,LI Xiao-wen.Correction of skyglint above water surface based on polarized principle[J].Advances in Water Science,2007,18(5):762-767. |
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| Authors: | ZHOU Guan-hua ZHAO Yong-chao GENG Xiu-rui LI Xiao-wen |
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| Affiliation: | 1.State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China;2.Graduate School of Chinese Academy of Sciences, Beijing 100039, China;3.Center for Remote Sensing and GIS, Beijing Normal University, Beijing 100875, China |
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| Abstract: | The specular reflected light above water surface,including sun-glint and sky-glint,is one of the key factors that affect remote sensing of water color.This paper aims to correct the sun-glint and sky-glint effects in measurements of upward radiance from water surface based on the polarized principle and the multi-angle polarized remote sensing.A polarization filter was placed in front of the sensor of ASD field spectrometer to obtain the polarized characteristics of water surface spectrum in various conditions.By contrast with the spectral obtained under different incident geometry and polarized conditions,the experimental results show that the reflected light can be corrected completely with an incident zenith angle of 53 degree(Brewster's angle) and zero polarized angle.And most of the reflected light can be corrected with a random incident angle and zero polarized angle.In conclusion,the reflected light can be reduced obviously or even removed completely based on the polarized principle,which provide important value to improve the accuracy of water color remote sensing. |
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| Keywords: | ocean color remote sensing polarize principle air-water interface reflected light above water surface correction |
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