Products Along-track Sea Level Anomalies Level-2+ (L2P)
Sentinel-3 A/B Altimetry L2P products will be discontinued as of January 1, 2025.
Users are encouraged to use EUMETSAT Level 2 (L2) products or CMEMS Level 3 (L3) products instead.
Types of dataset: Monomission altimeter product, available for several missions.
Contents: along-track corrected sea level anomalies with corrections wrt reference ellipsoid. Datasets of 1Hz spatial resolution for all missions + datasets of 20Hz spatial resolution for Copernicus Sentinel-3A&B, Sentinel-6MF, Jason-3 in Short Time Critical (STC) and Near-Real-Time (NRT)
Use: stationary or long-term geophysical and ocean phenomenon studies.
Description: Mono altimeter satellite product, with corrections and geophysical parameters. Note that monomission products by definition are not intercalibrated at crossover points. Thus Jason-1 and Envisat data for example may not be homogeneous at a given point, since their orbits are different. Note also that these products are not corrected from Large Wavelength Error (LWE), unlike multimission Ssalto/Duacs products. Check monomossion processing last updates.
Geographic coverage: Global, the maximum coverage in latitude depends on the mission.
Format: NetCDF-CF
Tools and reference:
- User handbook:
- Copernicus Sentinel-3 & Sentinel-6 Along-track Sea Level Anomalies Level-2+ (L2P) Product Handbook (1Hz and 20Hz datasets)
- Along-track Sea Level Anomalies Level-2+ (L2P) Product Handbook (all missions except Sentinel-3&6) (1 Hz datasets)
- Along-track Sea Level Anomalies Level-2+ (L2P) high frequency Product Handbook (all missions except Sentinel-3&6) (20 Hz datasets)
- The list of 2024 standards is given in the file standards_2024.png
- C. Kocha et al. 2023: 30 years of sea level anomaly reprocessed to improve climate and mesoscale satellite data record. DOI 10.24400/527896/a03-2023.3804 , OSTST 2023 meeting.,
- Kocha et al. 2023: Latest update of sea level rise: 30 years of multi-mission datasets EUMETSAT 2023 conference.,
- Lievin et al. 2023. Assessment of reprocessed L2P sea level anomaly products with DT2024 standards (focus on Sentinel-3). S3VT 2023 meeting.
- Quality reports: Daily Sentinel-3 L2P product quality monitoring reports, available for Near-Real-Time (NRT) and Short Time Critical (STC) products on the authenticated FTP and for Non-Time-Critical (NTC) products on the authenticated FTP.
The use of Copernicus Sentinel-3 and Sentinel-6 Michael Freilich products is described in the license agreement (section 13. Licence specific to Sentinel-3 L2P products).
Citations:
- for Copernicus Sentinel-3 & Sentinel-6 Michael Freilich missions, please refer to the license agreement to mention credits explicitly in function of your use (section 13. Licence specific to Sentinel-3 L2P products).
- for the other missions, please cite: "The altimeter products were produced and distributed by Aviso+ (https://www.aviso.altimetry.fr/), as part of the Ssalto ground processing segment"
Copyright :
- for Copernicus Sentinel-3 & Sentinel-6 Michael Freilich missions: 2016-ongoing CNES/CLS consortium under an EUMETSAT Contract, funded by the European Union. Further information in the license agreement
- for the other missions : 1992- ongoing Cnes-CLS
 | to get access Aviso products and select the products "Sea Level Anomalies Along-track Level-2+ (L2P) Sentinel-3&6" and/or "Sea Level Anomalies Along-track Level-2+ (L2P) for other missions" |
Near-Real-Time (NRT) L2P SLA
| Satellite | Distribution media | Quality reports | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Sentinel-3A 1Hz | Please refer to | Please refer to | 4 hours | 2 months | one pass per file | <100 Ko per file (zipped) |
| Sentinel-3A 20Hz | twice a day | 2 months | <3.5 Mo per file | |||
| Sentinel-3B 1Hz | 4 hours | 2 months | <100 Ko per file (zipped) | |||
| Sentinel-3B 20Hz | twice a day | 2 months | <3.5 Mo per file | |||
| Jason-3 20Hz | twice a day | 2 months | 4 Mo per file | |||
| Sentinel-6A MF 1Hz HR | 4 hours | 2 months | <130 Ko per file (zipped) | |||
| Sentinel-6A MF 20Hz HR | twice a day | 2 months | <3.5 Mo per file |
Short Time Critical (STC) L2P SLA
| Satellite | Distribution media | Quality reports | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Sentinel-3A 1Hz | Please refer to | Please refer to | 56 hours | 2 months | one pass per file | <100 Ko per file (zipped) |
| Sentinel-3A 20Hz | twice a day | 2 months | <3.5 Mo per file | |||
| Sentinel-3B 1Hz | 56 hours | 2 months | <100 Ko per file (zipped) | |||
| Sentinel-3B 20Hz | twice a day | 2 months | <3.5 Mo per file | |||
| Jason-3 20 Hz | every day | 2 months | 4 Mo per file | |||
| Sentinel-6A MF 1Hz HR | 44 hours | 2 months | <130 Ko per file (zipped) | |||
| Sentinel-6A MF 20Hz HR | twice a day | 2 months | <3.5 Mo per file |
Non Time Critical (NTC) L2P SLA
| Satellite | Distribution media | Quality reports | Delivery delay | Data period | Data used | File weight |
|---|---|---|---|---|---|---|
| Sentinel-3A 1Hz | Please refer to | Please refer to | 1.5 month | jun 2016 - ongoing | one pass per file | <100 Ko per file (zipped) |
| Sentinel-3B 1Hz | 1.5 month | nov 2018 - ongoing | ||||
| Sentinel-6A 1Hz HR | 1.5 month | sept 2021 - ongoing | ||||
| Sentinel-6A 1Hz LR | 1.5 month | sept 2021 - ongoing | ||||
| Jason-3 1Hz | - | 3 months | feb 2016 - ongoing | |||
| HY-2B 1Hz | - | 3 months | dec 2019 - aug 2023 | |||
| Jason-2 1Hz | - | - | jul 2008 - sep 2017 | |||
| Jason-1 1Hz | - | - | jan 2002 - jun 2013 | |||
| Saral 1Hz | - | 3 months | mar 2013 - ongoing | |||
| Cryosat-2 1Hz | - | 3 months | jan 2011 - ongoing | |||
| HY-2A 1Hz | - | - | apr 2014 - jun 2020 | |||
| Envisat 1Hz | - | - | may 2002 - apr 2012 | |||
| ERS-1 1Hz | - | - | oct 1992 - jun 1996 | |||
| ERS-2 1Hz | - | - | may 1995 - sep2003 | |||
| T/P 1Hz | - | - | sep 1992 - sep 2005 | |||
| GFO 1Hz | - | - | jan 2000 - sep 2008 |
