Mobile version

Gridded Sea Level Heights and derived variables

Types of dataset: Ssalto/Duacs gridded multimission altimeter products. 

Contents: gridded multimission sea surface heights computed with respect to a twenty-year mean. Several variables are proposed: Sea Level Anomaly, Absolute Dynamic Topography, Geostrophic Velocities. Several timeliness: near-real-time and delayed-time.

Condition of access : The processing and distribution of the Sea Level Anomaly (SLA-H), Absolute Dynamic Topography (ADT-H)  Heights and Geostrophic Velocities (SLA-UV and ADT-UV) products are made by:

Description: gridded multimission product, provided in near-real time and in delayed time. In delayed-time, there are two series available: the "allsat" series and the "twosat" series. In near-real-time, only the "allsat" series is distributed.

  • The near-real-time product is available during a few months at most, from the latest update of the delayed-time product to today. It is disseminated by CMEMS: see the details in the document Migration AVISO+ to CMEMS and AVISO+ to C3S (section3).
  • The delayed-time "allsat" product is the time serie of the merged maps computed with all the satellites available at a given time. It begins in 1993 and provide the maps with the best mapping as possible but not homogeneous in time. It is disseminated by CMEMS: see the details in the document Migration AVISO+ to CMEMS and AVISO+ to C3S (section4).
  • The delayed-time "twosat" product is the time serie of the merged maps computed with a maximum of two satellites at a given time. It begins in 1993 and provide the maps homogeneous in time thanks to a stable sampling but might not be the best in quality at a given time. It is useful for the climate studies for example which need stable product in time. It is disseminated by C3S and CMEMS: see the details in the document Migration AVISO+ to CMEMS and AVISO+ to C3S (section5).

The informations about the satellites taken into account are given in the NetCDF file global attributes description (named "platform").

Geographic coverage: global. A specific regional product with an improved quality is available in local areas.

Copyright
1993 - ongoing EU Copernicus Marine Service for near-real-time product and delayed-time "allsat" product.
1993 - ongoing Copernicus Climate Change and Atmosphere Monitoring Services for delayed-time "twosat" product. Useful links to CMEMS and C3S in the document: Migration AVISO+ to CMEMS and AVISO+ to C3S.

See also: DUACS Product validation & information

EnglishFrançais
Rss feedsContactPartnersFAQLexiconLegal noticePersonal Data Protection PolicyMobile
You must enable cookies in your browser preferences to save the modifications
You are using an older version of Internet Explorer, please update to take full advantage of Aviso+ features

Customize the home page

View all widgets
Reduce display
Public profile
User profile

Select/Deselect widgets

Discover AVISO+

Customizable home, reading tools, products search guide, etc.. Discover step by step the features of the new site AVISO+.

Customizable homepage

This home page is composed of blocks called "widgets".

Rearrange the blocks with a "Click & Drop".

Hide a widget with the cross at the top right. Reset or add a widget with the "wrench" icon. The "User" and "Public" profiles offer a predefined organization.

All the modifications are automatically saved as cookies on your machine so as to enable you to have your own specific AVISO+.

Reading tools

Ease your reading by choosing the page background colour (black/white) and/or by modifying the font size.

Browsing menu and breadcrum trail

To ease your browsing through AVISO+, you can use at any time the main banner items with the interactive submenus or use the browsing menu on the left side of the screen (it is open by default). For more readiness of the page contents, you can fold and unfold the browsing menu by clicking on the tab. At any time you can know where you are thanks to the browsing menu or the breadcrum at the top of the page.

Products search guide

The first submenu of the "Data" banner item leads you to a new search form enabling you to find quickier the product that suits your needs. The list of results is updated according to your selection criteria.

AVISO+ Multimedia

The first submenu of the "Multimedia" banner item leads you to AVISO+ collections of images and videos linked to altimetry and its applications. Have a nice visit!