Mobile version

News

14.01.2022 09:20 Age: 8 days

New version of Eddy Trajectories: META3.2exp NRT

Category: Website updates

The new version of the Mesoscale Eddy Trajectories Atlas META3.2exp NRT is available on AVISO+.

It is an experimental product and replaces the version 3.0exp NRT.

The differences between versions 3.0 and 3.2 are the following:

 

  • Pre - processing step : the NRT Absolute Dynamic Topography maps are filtered with an order 1 (previously order 3) 2D Lanczos filter with a half-power cutoff wavelength of 700 km (previously 500 km). These changes provide a better representation of the major currents gradients and the 1rst order filtering works better for pixels close to the land.
  • Detection sheme : the 55% threshold for the shape error test is increased to 70% to better take into account the eddy's deformation before and after interactions.
  • Tracking scheme : the association of eddies in trajectories is made when the contours of the eddies overlap from one day to another. Previously, the association was made by searching within a restricted area the closest eddy. The overlap method ensures a geographic coherence and prevents associations of independant trajectories. Moreover, the number of consecutive virtual observations - virtual observations are added when an association is made not the day after, but several days after the initial detection - is increased from 3 to 4.
  • Contour sampling : the contours coordinates are now stored on 20 points based on the Visvalingam algorithm to preserve the shape of the contour. Previously, contours coordinates where stored on 50 points uniformely spaced, resulting in larger files.
  • Time format : now the time is stored in float, previously it was in integer.

 

Note that both the change for the time format and the change in the the contour sampling may impact your code.

 

Moreover, the cumulated changes imply that there is no continuity between the previous 3.0exp and the 3.2exp two versions.


All information in the product page.

 

ACCESS:

The new files will be available on FTP on the same folder as for version 3.0expNRT

 

 

 

Any questions/remarks can be addressed to aviso(at)altimetry.fr

 


EnglishFrançaisEspañol
Rss feedsContactPartnersFAQLexiconMobile
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

The new 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!