Pre-Launch Characterisation and In-Orbit Calibration of GCOM-C/SGLI

Global Change Observation Mission (GCOM) consists of two series of satellites, GCOM-W (Water) and GCOM-C (Climate) for long-term monitoring of earth environment. Second-generation Global Imager (SGLI), the onboard mission instrument of GCOM-C, is the wide FOV multispectral optical radiometer in the wavelength range of near-UV to thermal infrared. SGLI will provide high accuracy measurements of Ocean, Atmosphere, Land and Cryosphere. JAXA successfully launched the GCOM-C satellite on December 23, 2017, and JAXA is carrying out the in-orbit checkout and initial calibration activities. This paper describes pre-launch characterization summary of the SGLI and in-orbit calibration plan. Especially we focus on the pre-launch and in-orbit radiometric performance.