Minimize Calibration

List of all OLCI Radiometric Calibration Sequences

Type Date Time Absolute
Orbit
Relative
Orbit

S01 (diffuser 1)

27-Feb-18

09:55:00

10575

207

S01 (diffuser 1)

14-Feb-18

12:15:00

10391

23

S05 (diffuser 2)

25-Jan-18

05:52:00

10102

119

S04 (diffuser 1)

25-Jan-18

04:11:00

10101

118

S01 (diffuser 1)

10-Jan-18

19:09:00

9896

298

S01 (diffuser 1)

25-Dec-17

12:41:00

9664

66

S01 (diffuser 1)

10-Dec-17

07:26:00

9447

234

S05 (diffuser 2)

22-Nov-17

10:14:00

9192

364

S04 (diffuser 1)

22-Nov-17

08:33:00

9191

363

S01

05-Nov-17

04:10:00

8946

118

S03

04-Nov-17

13:01:00

8937

109

S02

04-Nov-17

11:20:00

8936

108

S09

04-Nov-17

08:59:00

8935

107

S01

21-Oct-17

10:41:00

8736

293

S01

04-Oct-17

07:58:00

8492

49

S01

22-Sep-17

01:24:00

8317

259

S01

08-Sep-17

17:34:00

8127

69

S04 (diffuser 2)

22-Jul-17

09:50:00

7438

150

S04 (diffuser 1)

22-Jul-17

08:09:00

7437

149

S01

28-May-17

20:35:53

6653

134

S01

12-May-17

13:53:40

6428

294

S01

30-Apr-17

20:49:48

6261

127

S01

20-Apr-17

23:31:37

6120

371

S01

13-Apr-17

09:45:48

6012

263

S01

08-Apr-17

23:44:05

5949

200

S05

31-Mar-17

20:30:28

5833

84

S04

31-Mar-17

18:49:28

5832

83

S01

22-Mar-17

14:23:17

5701

337

S01

12-Mar-17

08:38:07

5555

191

S01

27-Feb-17

12:41:29

5372

8

S01

14-Feb-17

15:01:28

5188

209

S05

24-Jan-17

14:07:31

4888

294

S01

24-Jan-17

12:26:31

4887

293

501

10-Jan-17

08:28:04

4685

91


Absolute Gain Coefficients


The figure below displays the time evolution of the cross-track averaged gain, for each module, as a function of time. It shows that if a significant evolution occurred during the early mission, the trends tend to stabilise. In particular all calibrations since the beginning of August 2016 provide very stable results, within 0.5% for all bands.


OLCI Gain Coefficients

SNR Assessment


The SNR is computed for all Radiometric Calibration (RC) data as a function of band number. It is computed first at Calibration signal level then downscaled to the "typical ocean" level as specified in the MRD. It has been verified with a different methodology using Earth Observation data over oligotrophic waters (best matching the MRD requirement radiance level) that the SNR estimates from RC are reliable. All calibrations except the first one (orbit 183) are present with the colours corresponding to the orbit number (see legend in the figure). The SNR is very stable with time: the curves for all orbits are almost superimposed. The dashed curve is the MRD requirement.


OLCI SNR

Signal to Noise ratio as a function of the spectral band for the 5 cameras