Radiometric model of lunar based on GF-4 visible and near-infrared sensor

Lunar has stable spectral properties with a varying tendency of 10-8 per year. Due to the independent on the scattering and absorbing effects of atmosphere, lunar is a perfect radiometric reference for earth-observing satellite. Researching on the radiometric model of lunar gives a new path to on-orbit radiometric calibration for remote sensing satellite to get rid of the uncertainties of atmosphere on calibration accuracy. GF-4 of China was a geostationary remote sensing satellite with a big array CMOS detector, it can acquire the whole lunar disk image without earth-atmosphere stray light by rolling the satellite, and the instantaneous field of view (IFOV) of VNIR sensor to lunar is about 500m. Firstly, recalibration is implemented before further processing. Secondly, the radiometric properties of lunar are retrieved by the recalibration results. A common used method in researching the radiometry of lunar was adopted in this work: deriving the bidirectional reflectance factor (BRF) on three typical lunar calibration sites of Apollo-16, MS-2 and CE-3 with t GF-4 lunar image, and comparing the BRFs with SP on SELENE, M3 on Chandrayaan-1 and IIM on CE-1. The model of GF-4 VNIR sensor showed a relatively high consistency with other existed models as wavelength increasing. The results indicated that the radiometric model of lunar in this work had the potentiality to join the group of lunar models.