MSLA - UV Maps of geostrophic velocity anomalies
Types of dataset: Ssalto/Duacs gridded multimission altimeter products.
Contents: multimission gridded geostrophic velocity anomalies computed with respect to a twenty-year mean. The access to gridded sea level anomalies heights has changed, see the dedicated page: multimission gridded sea level anomalies heights (MSLA-H).
Use: Ssalto/Duacs gridded products are devoted to scientific applications and non-commercial use: study of ocean variability (mesoscale circulation, seasonal variation, El Niño...), including operational oceanography (near-real time products).
Condition of access: Ssalto/Duacs gridded products are devoted to scientific applications and non-commercial use (conditions of use are detailed in the licence agreement All Ssalto/Duacs product users need an account, see Access to Ssalto/Duacs data.
Data access service: see Data access service. In NRT, FTP delivers the most recent data (day-0) whereas Opendap/Gridded Data Extraction Tool/LAS only deliver data more than one month.
Description: gridded product, provided in near-real time and in delayed time. As a snapshot, each map represents the sea state for a given day. One spatial resolution is available: 1/4°x1/4° on a cartesian grid.
Geographic coverage: global
A specific regional product with an improved quality is available in local areas (more information).
Description: this delayed time product is available in two versions:
- "two sat merged" serie: this dataset is based on only two missions at most: Jason-2/AltiKa or Jason-2/Cryosat-2 or Jason-2 / Envisat or Jason-1 / Envisat or Topex/Poseidon / ERS, with the same groundtrack. Thus it is homogeneous all along the available time period thanks to a stable sampling, but might not be the best in quality at a given time. The use of the "two sat merged" serie is mainly for application in need of great stability (but it must be kept in mind that the data might not be of the best possible quality).
- "all sat merged" serie: up-to-date datasets with up to four satellites at a given time, using all missions available at a given time. Sampling and Long Wavelength Errors determination are improved, so this serie is better in quality but not homogeneous over the time period.
When only two satellites are available at a given time, the "two-sat-merged" and "all-sat-merged" files have the same content (files are duplicated).
The informations about the satellites taken into account are given in a new global attributes in the NetCDF file description (named "platform") and in the section "Temporal availability" of "Delayed-time Products" in the handbook.
Copyright : 2005 - ongoing CLS - Cnes
Description : In NRT, FTP delivers daily the most recent data (6-day delay, a 3-day delay and a 0-day delay ) whereas Opendap/Gridded Data Extraction Tool/LAS only deliver data more than one month.
Data period : within a few months at most, from the latest update of the DT products to today.
Copyright : 2001-ongoing CLS-Cnes.