Vicarious Calibration of Beijing-1 Multispectral Imagers
AbstractFor on-orbit calibration of the Beijing-1 multispectral imagers (Beijing-1/MS), a field calibration campaign was performed at the Dunhuang calibration site during September and October of 2008. Based on the in situ data and images from Beijing-1 and Terra/Moderate Resolution Imaging Spectroradiometer (MODIS), three vicarious calibration methods (i.e., reflectance-based, irradiance-based, and cross-calibration) were used to calculate the top-of-atmosphere (TOA) radiance of Beijing-1. An analysis was then performed to determine or identify systematic and accidental errors, and the overall uncertainty was assessed for each individual method. The findings show that the reflectance-based method has an uncertainty of more than 10% if the aerosol optical depth (AOD) exceeds 0.2. The cross-calibration method is able to reach an error level within 7% if the images are selected carefully. The final calibration coefficients were derived from the irradiance-based data for 6 September 2008, with an uncertainty estimated to be less than 5%.
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Chen, Z.; Zhang, B.; Zhang, H.; Zhang, W. Vicarious Calibration of Beijing-1 Multispectral Imagers. Remote Sens. 2014, 6, 1432-1450.
Chen Z, Zhang B, Zhang H, Zhang W. Vicarious Calibration of Beijing-1 Multispectral Imagers. Remote Sensing. 2014; 6(2):1432-1450.Chicago/Turabian Style
Chen, Zhengchao; Zhang, Bing; Zhang, Hao; Zhang, Wenjuan. 2014. "Vicarious Calibration of Beijing-1 Multispectral Imagers." Remote Sens. 6, no. 2: 1432-1450.