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

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"

DT-MSLA "Upd"

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

Low resolution (1°x1°)