(M)SLA - (Maps of) Sea Level Anomalies & geostrophic velocity anomalies
Types of dataset: Ssalto/Duacs multimission altimeter products
Contents: multimission gridded sea surface heights computed with respect to a seven-year mean
Use: study of ocean variability (mesoscale circulation, seasonal variation, El Niño...), including operational oceanography (near-real time products)
Description: gridded product, provided in near-real time and in delayed time. Two levels of resolution are available: high resolution (1/3°x1/3°, Mercator grid) or low resolution (1°x1°, Mercator grid). Mercator gridded product is also provided in a second version that is resampled on a 1/4°x1/4° cartesian grid (really destinated to users confused by the Mercator grid).
For gridded merged data, a formal mapping error file is also available, with geostrophic velocity anomalies.
Geographic coverage: global
A specific regional product with an improved quality is available in local areas (more information).
Format: NetCDF
Tools:
- User Handook: Ssalto/Duacs User Handbook : (M)SLA and (M)ADT Near-Real Time and Delayed Time Products
- Data reading software
DT-MSLA
Description: this delayed time product is available in two versions:
- "Ref" (Reference) series: homogeneous datasets based on two satellites (Topex/Poseidon, Jason-1 + ERS, Envisat) with the same groundtrack. Sampling is stable in time.
- "Upd" (Updated) series: up-to-date datasets with up to four satellites at a given time (adding GFO and/or Topex/Poseidon on its new orbit). Sampling and Long Wavelength Errors determination are improved, but quality of the series is not homogeneous.
Copyright : 2005-2008 CLS
DT-MSLA "Ref"
| Satellite | Distribution media | Frequency | Data period | File weight |
|---|---|---|---|---|
T/P, Jason-1 | FTP: | 2 months | October 1992 - ongoing | 2-3 MB per file (zipped) |
Merged (T/P or Jason-1 + ERS-1/2 or Envisat) | FTP: | 2 months | October 1992 - ongoing | 2-3 MB per file (zipped) |
DT-MSLA "Upd"
| Satellite | Distribution media | Frequency | Data period | File weight |
|---|---|---|---|---|
Merged | FTP: | 2 months | October 1992 - ongoing | 2-3 MB per file (zipped) |
RT & NRT-MSLA
Description : this product is available in near-real time within 7 days.
Condition of access : cf Access to Ssalto/Duacs data
Copyright : 2001-2008 CLS-Cnes
High resolution
| Satellite | Distribution media | Frequency | Delivery delay | Data period | File weight |
|---|---|---|---|---|---|
Merged (all available satellites) | FTP | Daily | 7 days | August 2001 - ongoing | 1.6 MB per file (zipped) |
anonymous FTP | 30 days | ||||
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Jason-1 | ftp | Daily | 7 days | June 2002 - ongoing | 1.6 MB per file (zipped) |
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Envisat | ftp | Daily | 7 days | August 2003 - ongoing | 1.6 MB per file (zipped) |
30 days | |||||
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ERS-2 | Daily | 30 days | August 2001 - June 2003 | 1.6 MB per file (zipped) | |
30 days | |||||
30 days | |||||
GFO | ftp | Daily | 7 days | August 2001 - ongoing | 1.6 MB per file (zipped) |
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T/P | FTP | Daily | 7 days | August 2001 - August 2002 | 1.6 MB per file (zipped) |
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Low resolution (1°x1°)
| Satellite | Distribution media | Frequency | Delivery delay | Data period | File weight |
|---|---|---|---|---|---|
Merged (all available satellites) | FTP | Daily | 7 days | August 2001 - ongoing | 134 kB per file (zipped) |
30 days | |||||
30 days | |||||
30 days | |||||


