Based on the GF1 and GF4 radiation calibration analysis

In order to test the in-orbit radiation characteristics of GF-1 and GF-4, and obtain accurate radiometric calibration coefficients, this paper proposes a MODIS and LandSat 8 cross-calibration method based on Dunhuang radiation correction field and a method for comparing the radiance error of GF-1 and GF-4 satellite images based on uniform regions. First, this article introduces the cross-calibration principle and the overview of the uniform target sample area, and compares the band matching and spectral response of the four remote sensors. Then, cross-calibration based on the scenes of the same area at the same time of GF-1, GF-4, MODIS, and LandSat 8 on 28 July 2017. The results show that the calibration coefficient error obtained by this method is within 6%. The error of the calibration coefficient obtained by cross-calibration with LandSat 8 satellite is smaller, which satisfies the basic remote sensing quantitative demand. The GF-1 satellite has high calibration accuracy and is suitable for cross-calibration research of China's independent satellite remote sensors. It is of great significance for the establishment of China's in-orbit calibration system.