A twin-channel difference model for cross-calibration of thermal infrared band

查看全文 作　　者：LI [1]JiaGuo;GU [1]XingFa;YU [1]Tao;LI [1]XiaoYing;GAO [1]HaiLiang;LIU [1]Li;XU [1]Hui

机构地区：[1]State Key Laboratory of Remote Sensing Science,Institute of Remote Sensing Applications,Chinese Academy of Sciences,Beijing 100101,China;

出　　处：《Science China(Technological Sciences)》索引2012年第55卷第7期,共9页

基　　金：supported by the National Natural Science Foundation of China (Grant No. 40971227);the International Corporation Program of Science and Technology Ministry of China (Grant No. 2010DFA21880) 摘　　要：Based on the conduction and transformation of the thermal infrared radiative transfer equation of water target,a twinchannel difference model(DM) was proposed to improve the calibration precision by conquering the limitation that the atmospheric condition when image is acquiring cannot be truly obtained in the traditional radiometric simulation calibration method.The analysis of surface,atmosphere and top-of-atmosphere(TOA) radiative energy decomposition demonstrated that the apparent TOA radiance of the uncalibrated channel is the differential combination of two reference channels.The DM avoids impacts from atmospheric temperature and density.The only impact is from water vapor(WV) content.Based on the fitting error analysis of 742 mid-latitude atmospheric profiles(column WV content:0-5×10 3 atm cm) selected from TIGR database,the DM is insensitive to WV content.The maximum error is less than 0.2 K when the view zenith angels(VZAs) of reference channels and uncalibrated channel are less than 30.The error becomes 0.3 K when VZAs range from 30 to 40 and 0.6 K when VZAs are in 40-50.Because the uncertainty increases when VZAs are larger than 50,the best range of VZAs is 30-50.The vicarious calibration results at Lake Qinghai field indicated that the calibration precision of the DM cross-calibration by using MODIS bands 31 and 32 as reference channels to calibrate IRS band 08 is similar to that of vicarious calibration.Therefore,the DM is a reliable alternative tool for sensor on-orbit calibration and validation with high precision and frequency. 关键词：校准精度热红外波段双通道差分模式辐射传输方程弗吉尼亚州大气条件参考通道

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A twin-channel difference model for cross-calibration of thermal infrared band

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