Mobile version
Aviso/Altimetry - Saral/AltiKa freeboard maps

Saral/AltiKa freeboard maps

In the frame of the PEACHI project, sea ice freeboard maps are computed for each SARAL/AltiKa cycle during winter, starting from cycle 08. The first step of the processing is to classify the waveforms as lead or sea ice echoes. The off-nadir leads are edited before computing the heights above the mean sea surface of leads and sea ice (hooking effects). The freeboard is then deduced as the difference between sea ice and leads heights. The maps are obtained by averaging the along-track freeboard per 1°x2° boxes over the entire SARAL/AltiKa cycle.


Freeboard height in cm (difference between sea ice and leads heights) estimated from AltiKa measurements on Arctic ocean, from 2013 (cycle 08). Credits CNES-CLS-LEGOS.

Saral/AltiKa Sea Ice extent

In addition, the following movie illustrates the evolution of sea ice extent from Saral/AltiKa in the Arctic and Antarctic regions from March 2013. Each map corresponds to the percentage (per box) of waveforms classified as sea ice.



ERROR: Content Element with uid "11909" and type "media" has no rendering definition!

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!