Current Altimetry processing baselines
Timeline and overview of the SRAL/MWR Processing Baselines of Sentinel-3.
02 December 2020
29 November 2018
SRAL/MWR Processing Baselines of Sentinel-3 - Baseline Collection 004
|Baseline Collection 004||PB 2.61||PB 2.68 - Marine|
|IPF versions||SRAL L1 (SR-1): 06.17
MWR L1 (MW-1): 06.11
SRAL/MWR L2 (SM-2): 06.18
|SRAL L1 (SR-1): 06.18/06.19/06.20*
MWR L1 (MW-1): 06.11
SRAL/MWR L2 (SM-2): 06.50
*Bug fix, no impact on data products
|Product Notice||L1 PN
|User Announcement||Major evolution of Sentinel-3 Altimetry products||New Sentinel-3 Altimetry Processing Baseline released soon|
|PB Deployment date (NRT)||21/01/2020||09/07/2020|
(sensing time & server)
|Manifest file||Pass number anomalies were corrected, the the Pass number of the products is correct and limited to 770.||Anomalies on the L1 manifest have been fixed:
|Calibration||The L1 AUTOCAL sequence was updated and the expected impact on L2 products is low (see below).|
|Retrackers||Update of fitting routine, to correct SWH issue (see below), small impact on retracked parameters.|
|SSHA||SSHA is now computed using the filtered ionospheric correction, both in SAR and PLRM.
The SSHA PLRM is now computed using PLRM SSB (bug fix)
|Improved filtered ionospheric correction used in the SSHA in very small NRT products.|
|MSS||Update of Mean Sea Surface (MSS) to DTU18|
|Tide Models||Update of FES2014 Tide Model library to the latest version of the library|
|Wet tropo||Update of radiometer derived Wet Tropo mostly due to updated MWR Antenna Patterns, larger effect getting closer to the coast|
|Wind Speed/Backscatter coefficient||Improved Wind Model for very low/high wind speeds||A slight difference on the sigma 0 (below 0.1 dB) and wind speed (below 0.2 m/s) is expected, due to the updated L1 AUTOCAL.|
|SWH||Correction of a software issue for 20-Hz SWH|
|Sea Ice||Improvement of the Sea-Ice concentration close to the coastline; no more spuriously low values very close to the cost.|
|New parameters||Filtered Ionospheric correction (iono_cor_alt_filtered_01_ku and iono_cor_alt_01_filtered_plrm_ku)||L1A new format: Considering that CAL1 and CAL2 do not change rapidly and are therefore do not need to be repeated for each measurement in the L1A products, the time dimension (time_l1a_echo_sar_ku) and the index (ltm_max_ind) of the following variables has been removed:
|Other fixes or changes in the PBs||
|Changes to Ground Segment or Spacecraft||28/05/2019: The KREMS safe zone* for both S3A and S3B has been reduced from 300 km radius (around the KREMS radar facility) to 100 km radius.
*zone of the globe where the radiometer (MWR) is disabled and, thus, there is no wet tropospheric correction available from the radiometer, causing the SSHA to be set to a default value.
|Since 18/06/2020 a new OLTC is used on board of S3B. The updates are mostly relevant for land users.|
For a complete list of changes, please consult the product notices listed above.
For the historical summary table, see Past processing baselines.