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CERES Calibration

CERES Calibration

Calibration Home  →  CERES Calibration Coefficients

Satellite	Longitude	Launch Date	CNT. Resp	DSL Range	E0	g0	g1	g2	C0	U (%)	DCC/Desert	DCC+Desert+LaRC	Space CNT.	Data Src.	Data Bit
GOES-5	75W	May 22, 1981	Squared	86-1151	531.7	8.69e-03	3.13e-07	0.00000	999	3.38	Image	Image	Image	NOA	8-bit
GOES-6A	108W	Apr 28, 1983	Squared	48-1693	531.11	8.81e-03	1.56e-06	0.00000	25.0	4.76	Image	Image	Image	NOA	8-bit
GOES-7	98W/135W	Feb 26, 1987	Squared	718-1757	520.8	9.59e-03	1.86e-06	0.00000	999	1.79	Image	Image	Image	NOA	8-bit
GOES-8	75W	Apr 13, 1994	Linear	186-3259	518.28	2.58e+00	6.46e-04	-4.49e-08	7.0	0.57	Image	Image	Image	NOA	8-bit
GOES-9A	90W	May 23, 1995	Linear	238-1149	515.68	2.27e+00	4.39e-04	0.00000	7.0	0.68	Image	Image	Image	NOA	8-bit
GOES-9B	135W	May 23, 1995	Linear	2915-3828	515.68	2.09e+00	3.33e-04	0.00000	7.0	0.38	Image	Image	Image	NOA	8-bit
GOES-10	135W	Apr 25, 1997	Linear	478-3338	504.29	2.01e+00	7.46e-04	-8.85e-08	7.0	0.68	Image	Image	Image	NOA	8-bit
MET-2A	0	Jun 19, 1981	Linear	576-1126	414.85	1.87e+00	5.43e-05	0.00000	4.0	0.80	Image	Image	Image	EUM	8-bit
MET-2B	0	Jun 19, 1981	Linear	2157-1615	414.85	1.71e+00	-1.75e-05	0.00000	4.0	1.70	Image	Image	Image	EUM	8-bit
MET-3A	0	Jun 15, 1988	Linear	62-364	427.85	1.55e+00	1.76e-04	0.00000	4.0	1.26	Image	Image	Image	EUM	8-bit
MET-3B	50W	Jun 15, 1988	Linear	579-944	427.85	1.89e+00	1.06e-04	0.00000	4.0	0.73	Image	Image	Image	EUM	8-bit
MET-4	0	Mar 06, 1989	Linear	101-1806	442.03	1.81e+00	1.42e-04	0.00000	4.0	1.25	Image	Image	Image	EUM	8-bit
MET-5A	0	Mar 02, 1991	Linear	1079-1175	467.94	1.86e+00	4.62e-05	0.00000	4.0	0.61	Image	Image	Image	EUM	8-bit
MET-5B	63E	Mar 02, 1991	Linear	3332-5767	467.94	1.85e+00	6.32e-05	0.00000	4.0	0.65	Image	Image	Image	EUM	8-bit
MET-6	0	Nov 20, 1993	Linear	1182-1638	468.93	1.92e+00	7.13e-05	0.00000	4.0	0.47	Image	Image	Image	EUM	8-bit
MET-7	0/57E	Sep 02, 1997	Linear	560-5431	446.07	1.90e+00	1.70e-04	-1.24e-08	4.5	0.70	Image	Image	Image	EUM	8-bit
GMS-1	140E	Jul 14, 1977	Linear	2377-1528	534.77	1.61e-02	-1.12e-06	0.00000	2.5	1.01	Image	Image	Image	JMA	8-bit
GMS-2A	140E	Aug 11, 1981	Squared	704-888	530.84	1.05e-02	1.55e-06	0.00000	2.7	0.63	Image	Image	Image	JMA	8-bit
GMS-2B	140E	Aug 11, 1981	Squared	1070-1131	530.84	NaN	NaN	0.00000	2.7	NaN	Image	Image	Image	JMA	8-bit
GMS-3	140E	Aug 03, 1984	Squared	43-1960	516.1	9.38e-03	1.25e-06	0.00000	8.0	1.64	Image	Image	Image	JMA	8-bit
GMS-4	140E	Sep 05, 1989	Squared	133-1109	532.39	NaN	NaN	0.00000	5.0	NaN	Image	Image	Image	JMA	8-bit
GMS-5	140E	Mar 18, 1995	Squared	89-1981	418.97	6.75e-03	1.99e-07	0.00000	0.0	0.59	Image	Image	Image	JMA	8-bit

The Radiance (L) in units of Wm^-2sr^-1µm^-1 is computed from the calibration gain (g) and the measured single-gain 8-bit count (C) from the ISCCP B1U 8-bit GEO-sensor datasets, the 8-bit count space count or offset (C₀) and the day since launch (dsl), as shown below depending on the response of the GEO-sensor.

Radiance (L) is computed for Linear Count Response GEO-sensors as: L = g • (C - C₀), where g = g₀ + g₁• dsl + g₂• dsl²
Radiance (L) is computed for Squared Count Response GEO-sensors as: L = g • (C² - (C₀)²), where g = g₀ + g₁• dsl + g₂• dsl²
The Radiance (L) is converted to the Nominal or Scaled Reflectance (ρ_scaled) as:

ρ_scaled=L/E₀
The Uncertainty (U %) of the GEO-calibration as given in above table is the 'Temporal Variablity' about the 'Timeline Fit' in each case (see image under the DCC+Desert+LaRC column). The DCC and DESERT models are also referenced to the Aqua-MODIS Collection 6 Band 1 data. This Uncertainty does not include either the Aqua-MODIS Collection 6 Band 1 Absolute Uncertainty (1.6%) or the DCC and DESERT Calibration Transfer Uncertainty.