HJ1A/HSI Radiometric Calibration and Spectrum Response Function Sensitivity Analysis
GAO Hai-liang1, 2, 3, GU Xing-fa1, 3*, YU Tao1, 3, LI Xiao-ying1, 3, GONG Hui1, 2, 3, LI Jia-guo1, 2, 3, ZHU Guang-hui4
1. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China 3. The Center for National Spaceborne Demonstration, Beijing 100101, China 4. Henan University, Kaifeng 475001, China
Abstract：Hyper spectrum imager (HSI) loaded on HJ-1A satellite is Chinese first spaceborne hyperspectrum sensor. Since the HSI has no spectrum response function of all channels, the usually used calibration method-reflectance based method has been modified, and a new calibration method is proposed, in which the spectrum response function is neglected. Based on the calibration experiment data of Dunhuang in Aug., 2009, the HSI sensor was calibrated on orbit. The different kinds of spectrum response were constructed based on the formula, and the errors of calibration results with different spectrum response function were analyzed. The results show, expecting for the channels of water vapor and oxygen absorption channel, the influence of spectrum response function in other channel is less than 3%, and the calibration result based on new calibration method can satisfy the application requirement.
Key words：Hyper-spectrum imager;Radiometric calibration;Spectrum response function;Sensitivity analysis;Dunhuang test site
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