The new Sentinel-3A and -3B OLCI processing update, on 27 April 2023, includes changes in both Level-1B and Level-2 Ocean Colour products associated with processing baselines OL__L1_.002.24.00 and OL__L2M.003.03.00, respectively.
Last Updated
24 April 2023
Published on
24 April 2023
The changes are:
Modification in OLCI L1B flag definition.
Detection of pixels that include partially saturated spectra.
Update in geometric spatial regridding, to improve image continuity between the OLCI cameras.
Routine revision of OLCI radiometric calibration.
With respect to the two main changes:
Detection and flagging of pixels affected by the partial saturation anomaly has been implemented. See OLCI anomalous spectral samples - user note for the description of the anomaly.
In L1B products, modifications have been introduced in L1B Quality Flags data set to accommodate the new partially saturated flag. A new flag ‘partially saturated’ was added indicating an occurrence of the partial saturation anomaly at, at least, one pixel’s band. The previous 21 ‘saturated’ flags per band were changed to a single ‘saturated’ flag that indicates that there is a normal pixel saturation in, at least, one band. All ‘saturated’ and ‘partially saturated’ bands of a pixel are now set to the 'no data' value in their respective L1B radiance data files (i.e set to the _FillValue attribute as specified in the netCDF files).
In L2 products, the partially saturated and saturated bands in a pixel are denoted by a single ‘saturated’ flag. The pixel L2 parameters are set to the 'no data' value. There are no changes to the L2 Quality Flags data set.
In addition, the spatial regridding step has been modified to accommodate camera-to-camera pointing variability and enable spatial continuity between the five OLCI cameras. The regridding change is reflected in the 'frame offset' quantity available in the instrument_data.nc annotation file in L1B and L2 products and it is now provided on the image grid and varies with time.
