High calibration accuracy is required to detect small signals of the Earth environmental changes and achieve the GCOM-C mission targets.
SGLI calibration team synthetically uses the multiple methods, e.g., the solar-diffuser as the main calibrator, lamp data for checking the launch shift, and moon observation for monitoring long-term change.
Sensor calibration models which become the base of all calibration items are constructed through pre-launch ground characterization tests.
Vicarious adjustment will be conducted over both the land and the ocean, and the results will be compared to the on-board calibration methods and other satellite sensors in cooperation with international community and CEOS Cal/Val groups.
The calibration & validation monitor is here.
 Operation Concept of Second-generation Global Imager (SGLI), K. Tanaka, Y. Okamura, T. Amano and M. Hiramatsu,K. Shiratama, SPIE-AP, Incheon, Oct. 13, 2010.