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 (updated on 11 Aug. 2021)
Coefficients for Ver.3 land surface reflectance and aerosol products are here

λ(nm)(channel)	380(VN01)	412(VN02)	443(VN03)	490(VN04)	530(VN05)	566(VN06)	672(VN07)	672(VN08)	763(VN09)	867(VN10)	867(VN11)	1055(SW01)	1385(SW02)	1635(SW03)	2209(SW04)	672(PI01)	866(PI02)
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	-4.203E-05	-5.815E-05	0.0	0.0	-1.810E-05 *3	-7.464E-06 *3
kv0(MOBY+BOUSSOLE N=83) *1	0.992	1.037	1.011	1.026	1.062	1.040	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	0.991 *4	0.979 *4
kv0(MOBY N=69) *1	0.996	1.041	1.015	1.030	1.066	1.043	1.0	0.994	0.948	1.0	0.994
kv0(BOUSSOLE N=14) *1	0.971	1.013	0.989	1.007	1.043	1.028	1.0	0.992	0.954	1.0	0.979
kv0(Aqua Rrs N=43621501) *1	0.985	1.024	1.006	1.010	1.060	1.038	1.0	1.007	0.979	1.0	0.988
kv0(RadCALNet +GOSAT/RRV N=140) *1	0.970	1.011	0.976	1.004	1.010			0.988	1.055		0.986	1.037		1.007	1.041
kv0(PICSCAR Libya4 N=443)	0.977	0.995	0.969	1.010	1.005			1.011			0.983	1.010		0.977		1.0201	0.9851
kv0(EGRIP N=3) *1	0.976	1.030	1.001		1.047				0.963		1.003	1.015		0.930	0.954
kv0(MOBY+BOUSSOLE *2 N=82)	1.000	1.046	1.020	1.033	1.069	1.045	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	1.0	0.991 *4	0.979 *4
kv0(MOBY *2 N=69)	1.003	1.048	1.022	1.036	1.072	1.047	1.0	0.994	0.946	1.0	0.962
kv0(BOUSSOLE *2 N=13)	0.985	1.028	1.003	1.019	1.053	1.035	1.0	0.991	0.949	1.0	0.978
kv0(Aqua Rrs *2 N=40769994)	0.994	1.034	1.016	1.020	1.069	1.046	1.0	1.008	1.0	1.0	0.986

*1 The aerosol models are set by the Aeronet climatology (see ATBDs). "MOBY+BOUSSOLE" is recommended for the ocean color and aerosol processing.
*2 The aerosol models are set by Shettle and Fenn 1979. "MOBY+BOUSSOLE" is recommended for the ocean color processing.
*3 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.
*4 They are derived by comparison of TOA reflectance of the POL nadir path (RSP034) in 2020.

Summary of vical results

• MOBY + BOUSSOLE

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

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

• 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)
  

• AERONET-OC (Rrs validation of kv by MOBY+BOUSSOLE) (provided by AERONET)