Abstract
Accurate on-orbit radiometric calibration is the fundamental to quantitative remote sensing. Based on the thermal infrared radiative transfer model and Double Difference (DD) method, the on-orbit radiometric calibration in the thermal infrared channels of the advanced MEdium Resolution Spectral Imager (MERSI-2) on Chinese Fengyun 3D (FY-3D) are evaluated against the channels of Advanced Himawari Imager (AHI) on the Himawari 8 satellite. The results shows that the on-orbit radiometric calibration of FY-3D MERSI-2 channel 25 (12.0 µm) is quite consistent with the AHI channel 15, whereas the radiometric calibration biases (the mean of the double differences ± standard deviation) in FY-3D MERSI-2 channels 23 (8.55 µm) and 24 (10.8 µm) are −0.17±0.26 K and −0.28±0.30 K, respectively. The on-orbit radiometric calibration biases are finally corrected by linear fits on the matching observations.
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