GCOM-C post launch calibration (updated in Feb. 2021)

1. On board and moon calibration

• On-orbit operation results of GCOM-C/SGLI (in Japanese) (62th meeting of the Japanese Society for Aeronautical and Space Sciences, Fukuoka, Oct. 26, 2018)
• First year on-orbit calibration activities of SGLI on GCOM-C satellite (SPIE Asia-Pacific, Hawaii, Sep. 26, 2018)
• Temporal change rate (kvt) from 00:00 1st Jan. 2018 (D=0.0) is modeled by the moon calibration (which has been corrected in the Ver.2 L1B data (processing since 29 June 2020)
  Lcorr(λ) = Lorig(λ) / kv(λ)
  kv(λ) = kv0(λ) * (1.0 + kvt(λ) * D)
  
• L1B VNR V1->V2 conversion considering the offset correction L1B_V1_V2_conversion

2. Vicarious calibration

λ (nm)	380(VN01)	412(VN02)	443(VN03)	490(VN04)	530(VN05)	566(VN06)	672(VN07)	672(VN08)	763(VN09)	867(VN10)	867(VN11)	672(PL01)	866(PL02)	1055(SW01)	1385(SW02)	1635(SW03)	2209(SW04)
kvt (day^-1)	-6.204E-05	-6.059E-05	-5.793E-05	-5.049E-05	-4.202E-05	-3.063E-05	-5.042E-06	-4.339E-06	0.0	0.0	0.0	-1.810E-05 *2	-7.464E-06 *2	-4.203E-05	-5.815E-05	0.0	0.0
kv0(MOBY+BOUSSOLE)*1	0.976	1.023	0.997	1.015	1.051	1.033	1	1.002	0.998	1	1	(0.984)	(0.980)	1	1	1	1
kv0(MOBY N=55)	0.982	1.029	1.003	1.019	1.056	1.036	1	1.003	1.017	1	1
kv0(BOUSSOLE N=17)	0.954	0.999	0.977	1.001	1.036	1.026	1	0.996	0.945	1	1
kv0(AERONET-OC N=752)	0.960	1.006	0.983	1.007	1.049	1.033	1	1.005	0.979	1	1
kv0(RadCALNet+GOSAT/RRV N=104)	0.974	1.020	0.988	1.015	1.027	NA	NA	0.997	1.064	NA	0.986	NA	NA	1.035	NA	0.998	1.025

*1 recommended for the ocean color processing
*2 Temporal changes of polarization channels, PL01 and PL02, are not corrected in the L1B processing. Please see the document to correct the temporal gain change by yourself.

Summary of vical results

• MOBY + BOUSSOLE

• MOBY (provided by NOAA; Clark et al., 2003)

• BOUSSOLE (provided by D. Antoine; Antoine et al., 2006)

• AERONET-OC (as validation) (provided by AERONET)

• RadCalNet (developed by CEOS), EGRIP, and RRV (GOSAT project)

• Three RadCalNet sites are used, University of Arizona's site at Railroad Playa, Nevada, USA, the CNES site at La Crau, France, and the ESA/CNES site in Gobabeb, Namibia (link to the RadCalNet)