基于光谱校正的TG-2/MAI在轨监测及交叉定标  

On-orbit monitoring and inter-calibration for TG-2/MAI based on spectral correction

作　　者：郭俊杰 姚志刚 赵增亮 韩志刚 江军 GUO Junjie;YAO Zhigang;ZHAO Zengliang;HAN Zhigang;JUNG Jun(Unit 63729,Taiyuan 030027,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China;Beijing Applied Meteorology Institute,Beijing 100029,China)

机构地区：[1]63729部队,山西太原030027 [2]地理信息工程国家重点实验室,陕西西安710054 [3]北京应用气象研究所,北京100029

出　　处：《测绘科学与工程》2019年第5期54-59,共6页Geomatics Science and Engineering

基　　金：国家自然科学基金资助项目(NSFC41575031);中国博士后基金资助项目(2015M580124)。

摘　　要：搭载于TG-2空间实验室上的多角度偏振成像仪MAI(Multi-angle Polarization Imager)是我国首个在轨运行的多角度偏振遥感仪器。为分析和提高MAI 1级产品的质量,本文基于光谱校正方法,利用MODIS(Moderate-Resolution Imaging Spectra radiometer)各通道反射率数据对MAI 565nm、670 nm、865 nm以及910 nm通道开展了在轨监测及交叉定标。通过对比分析MAI观测到的大气层顶(Top of Atmosphere,TOA)反射率和MODIS TOA处参考反射率,将MODIS作为标准仪器,给出了基于MODIS的MAI在轨交叉定标方程。此外,通过对比分析表明,MAI与MODIS参考反射率星现出显著的线性关系,二者相关系数在0.93以上,MAI四个通道的反射率与MODIS参考反射率的平均绝对偏差均在8%以内,偏差的标准差在7%以内。The multi-angle polarization imager(MAI)on the TG-2 space laboratory is the first on-orbit multi-angle polarization remote sensing instrument in China.In order to analyze and improve the quality of MAI Level 1 products,on-orbit monitoring and inter-calibration of MAI 565 nm,670 nm,865 nm and 910 nm channels based on MODIS reflectance date are carried out in this paper.The top of atmosphere(TOA)refectivity observed by MAI it compared and analyzed with the reference reflectivity at TOA obtained by MODIS,and the MAI on-orbit inter-calibration equation is proposed to use MODIS as a standard instrument.In addition,the reference reflectance of MAI and MODIS shows a significant linear relationship,and the correlation coefficient is above 0.93.The average absolute deviation between the reflectivity of the four channels of the MAI and the reference reflectance of MODIS is within 8%,and the standard deference of the deviation is within 7%.

关 键 词：MAI 交叉定标 光谱校正 相关系数 性关系 

分 类 号：P415[天文地球—大气科学及气象学]