An overview of ISS HISUI hyperspectral imager radiometric calibration

Kenta Obata, Satoshi Tsuchida, Izumi Nagatani, Hirokazu Yamamoto, Toru Kouyama, Yoshiro Yamada, Yu Yamaguchi, Juntaro Ishii

Abstract: The hyperspectral imager of the HISUI (Hyperspectral Imager Suite) project will be deployed and operated in the International Space Station (ISS) Japanese Experiment Module-Exposed Facility (JEM-EF) in FY2018. The pre-launch calibration is conducted using a large integrating sphere traceable to the SI, and after the launch, the onboard calibration will be carried out using onboard calibration unit including a lamp. The vicarious calibration will be conducted over the dry lake sites located both in northern hemisphere and in southern hemisphere, and we may also use automated calibration facilities due to the effects of orbital characteristics for the ISS. The HISUI hyperspectral imager will be cross-calibrated using forthcoming hyperspectral sensors flying on ISS. The data associated with these calibrations will be archived in the Calibration Data Archive System (CDAS), and the HISUI calibration working group plans to assess HISUI radiometric performance and produces radiometric (geometric) calibration databases on CDAS, which are required in Level 1 processing.