Minimize Calibration

List of all OLCI Radiometric Calibration Sequences

Type Date Time Absolute Orbit Relative Orbit
501 10-Jan-17 08:28:04.000 4685 91
S01 24-Jan-17 12:26:31.458 4887 293
S05 24-Jan-17 14:07:31.458 4888 294
S01 14-Feb-17 15:01:28.053 5188 209
S01 27-Feb-17 12:41:29.000 5372 8
S01 12-Mar-17 08:38:06.709 5555 191
S01 22-Mar-17 14:23:16.927 5701 337
S04 31-Mar-17 18:49:27.707 5832 83
S05 31-Mar-17 20:30:27.707 5833 84
S01 8-Apr-17 23:44:05.369 5949 200
S01 13-Apr-17 09:45:48.000 6012 263
S01 20-Apr-17 23:31:36.774 6120 371
S01 30-Apr-17 20:49:47.611 6261 127
S01 12-May-17 13:53:40.051 6428 294
S01 28-May-17 20:35:53.310 6653 134

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 stabilize. In particular all calibrations since beginning of August 2016 provide very stable results, within 0.5% for all bands.

S3MPC 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.


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