摘要
以TERRA MODIS传感器热红外31通道为参考标准，完成对CBERS-02 IRMSS传感器热红外通道的交叉辐射定标．在与MODIS相应通道的交叉辐射定标中选取了2004年8月～12月间的7次双星同步观测青海湖和太湖的昼夜数据，通过两传感器相应通道间的光谱匹配，利用MODIS数据推算IRMSS的入瞳辐亮度，再从IRMSS影像上提取对应的DN值．对交叉定标获取的数据，进行多点线性回归，获得定标系数：增益8．0567，单位：DN／（W／m^2／sr^1／μm^1）；截距47．892，单位：DN．并对定标数据进行了精度评价和检验，结果表明该方法所获取的定标系数精度与MODIS定标数据相当，可以满足定量化应用的需要。
TERRA MODIS band 31 was selected as the criterion for doing the radiometric cross-calibration of CBERS-02 IRMSS thermal band. From August to December, 2004, seven times day and night synchronous images of two sensors passing through the Lake Qinghai and Lake Taihu were selected to obtain the cross-calibration data. TERRA MODIS band 31 data were used to conduct out the pupil radiance of CBERS-02 IRMSS band 9 based on the two sensors＇ spectrum matching, and then the DN values were picked-up from the IRMSS data in the same area. A new model to calculate the radiometric calibration coefficients was carried out in this study. The model is multi-points linear regression method with 7 times day and night synchronous images at different dates and locations. The radiometric cross-calibration coefficients are 8. 0567 （gain, unit： DN/（W/m^2/sr^1/μm^1）） and 47. 892 （offset, unit： DN）. Accuracy estimate of calibration coefficients was carried out. The results show that the calibration coefficients obtained from the linear regression method have a similar precision as TERRA MODIS band 31 ＇ s. The calibration coefficients can satisfy the quantitative applications of CBERS-02 IRMSS thermal data.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2006年第4期261-266,共6页
Journal of Infrared and Millimeter Waves
基金
中国科学院百人计划(KZCX0415)
国家教育部留学回国人员科学研究启动基金重点(HX040013)
国防科学工业委员会(KJSX0401)
陕西省教育厅专项科研计划(05JK221)资助项目
关键词
热红外通道
光谱匹配
交叉定标
线性回归法
thermal channel
spectrum matching
radiometric cross-calibration
linear regression method
