多角度偏振成像仪的海洋场景定标与水色反演  

Ocean Sites Calibration and Water Color Retrieval for Directional Polarimetric Camera

作　　者：潘雨薇 陈晶晶[1] 孙亮 张鹏飞 陈斐楠 孟炳寰 向光锋 洪津[2] Pan Yuwei;Chen Jingjing;Sun Liang;Zhang Pengfei;Chen Feinan;Meng Binghuan;Xiang Guangfeng;Hong Jin(School of Instrument Science and Opto-electronics Engineering,Hefei University of Technology,Hefei 230009,Anhui,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,Auhui,China;Shanghai Institute of Satellite Engineering,Shanghai 200240,China)

机构地区：[1]合肥工业大学仪器科学与光电工程学院,安徽合肥230009 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031 [3]上海卫星工程研究所,上海200240

出　　处：《光学学报》2024年第18期234-244,共11页Acta Optica Sinica

基　　金：高分专项(民用部分)卫星应用共性关键技术项目(50-Y20A38-0509-15/16);卢嘉锡国际合作团队项目(GJTD-2018-15);国家自然科学基金(11504383);国家自然科学基金委员会青年科学基金项目(61903116);安徽省自然科学基金青年项目(1908085QE232);中国科学院合肥研究院院长基金(YZJJ2024QN10)。

摘　　要：为拓展陆地生态系统碳监测卫星多角度偏振成像仪(DPC)的应用领域,首先对其进行海洋场景可见光波段的瑞利散射定标,而后采用Terra星中分辨率成像光谱仪(MODIS)光学厚度产品结合查找表的方法估算大气程辐射,并进行大气校正,最后采用辐射定标前后DPC的443、490、565 nm波段作为叶绿素a(Chl-a)反演的输入。选择2022年8月22日探测的澳大利亚西北部海洋区域作为反演区域,并利用MODIS在相同区域、日期的水色反演数据做真实性检验。检验结果证实定标后DPC测量的Chl-a质量浓度与MODIS数据之间相关性有所提升。Objective Chlorophyll-a(Chl-a)mass concentration is a primary indicator for water color retrieval.In the visible wavelength band,compared to the contribution of atmospheric radiance,the contribution of water radiance constitutes only a small fraction of the total radiance received by the remote sensing sensor at the top of the atmosphere.Therefore,there is a high demand for the radiance detection accuracy of the remote sensors,which requires accurate on-orbit radiometric calibration before the data can be applied.The large field-of-view remote sensor,the directional polarimetric camera(DPC),is not designed with an on-board calibration and cross-calibration system.With the development of remote sensing technology,site calibration has become a common method for alternative calibration of satellite remote sensors in orbit.We use the ocean scene to carry out the on-orbit calibration of the visible band and verify the water color remote sensing products before and after the calibration.This proves that Rayleigh scattering calibration based on the ocean scene can improve the authenticity and accuracy of the water color remote sensing products of the DPC.Methods Guided by this concept,to expand the application scope of the Carbon Monitoring in Terrestrial Ecosystems Satellite(TECIS)’s DPC,we initially perform Rayleigh scattering calibration on the DPC for ocean scenes from the CM Satellite,screening according to surface atmospheric conditions to obtain calibration sample points.Subsequently,we estimate the top-of-atmosphere apparent reflectance of the DPC in the blue and green bands,comparing it with the measured reflectance of the DPC to derive the radiometric calibration factor A.Finally,we validate the accuracy of the radiometric calibration.Then,combining the MODIS aerosol optical thickness product with the look-up table method,we estimate the atmospheric range radiation for atmospheric correction.The DPC bands at 443,490,and 565 nm,pre-and post-radiometric calibration,are used as inputs to the Chl-a retrieval alg

关 键 词：海洋光学 叶绿素质量浓度 辐射定标 反演算法 波段比值法 查找表 遥感 

分 类 号：P76[天文地球—海洋科学]