MSLA - Maps of Sea Level Anomalies and Geostrophic Velocity Anomalies

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)

Gridded data (1/3°x1/3° on a Mercator grid), available in near-real time and in
delayed time in NetCDF format.

In delayed time, two types of products are available:
- "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.

In near-real time this product is available in high (1/3°x1/3°) an low (1°x1°)
resolution. For gridded merged data, a formal mapping error file is also
available, with geostrophic velocity anomalies.

Regional products with an improved quality are available in local areas
("http://www.aviso.oceanobs.com/html/donnees/produits/hauteurs/regional/")