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《Science of Surveying and Mapping》 2008-S3
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WHI in-situ calibration and atmosphere correction in case-II water

ZHANG Hao①,ZHANG Bing②,LI Jun-sheng②,SHEN Qian①(①State Key Laboratory of Remote Sensing Sciences,Jointly Sponsored by the Institute of Remote Sensing Applications of CAS and Beijing Normal University,Beijing 100101,China; ②Center for Earth Observation and Digital Earth Chinese Academy of Sciences,Beijing 100080,China)  
Wide field-of-view Hyperspectral Imager(WHI) is an airborne imaging spectrometer with a 5nm spectral resolution,of which the spectrum ranges from 406nm to 985nm. For evaluating its application in case-II water,a flight was carried out in Taihu in January 9,2006. Meanwhile,the in-situ measured spectra by ASD and measured atmosphere parameters by sun photometer CE318 were also accomplished. Before retrieving water-quality parameters,two crucial recalibration processes were done:Field recalibration was accomplished by comparing the two calibration targets' modeling radiance at sensor level and their lab calibrated radiance;Vicarious calibration was done by comparing the 6S atmosphere corrected remote sensing reflectance (Rrs) with the in-situ measured Rrs of a synchronous station. Then,atmosphere correction Rrs was performed by 6S model to retrieve Rrs of Taihu and the accuracy was no more than 5% from 532nm to 750nm validated by other two synchronous stations.
【Fund】: 国防科工委民用航天空间应用项目“新一代环境监测高光谱卫星指标论证”;; 无星上定标系统小卫星辐射定标关键技术研究(2007AA12Z138)
【CateGory Index】: TP79
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