New Dissemination Portal for THEIA River and Lake Water Level Products – HYDROWEB

All THEIA data and products available on hydroweb.next

At the end of 2023, the distribution of THEIA river and lake level products derived from space altimetry will be transferred to the hydroweb.next.theia-land.fr portal, the new thematic portal for hydrology from the Theia, part of the French Research Infrastructure, Data Terra.

An ever-increasing number of series, with great historical depth

These time series provide continuous, long-term data (in some cases over 30 years) on the level of rivers, lakes, and reservoirs around the world. River products are provided at the point where a satellite repeatedly passes over the watercourses, thus defining ‘virtual stations’. For lake products, several satellite missions can provide information on the average height of a given lake and, for some of them, also the surface area and variation in volume.

Thanks to the joint efforts of CNES, LEGOS, CLS, the Copernicus and CCI programmes (ESA) and many other partners, the number of targets tracked is constantly increasing worldwide.

Global coverage of lake and river water level products over the full time period (1992-2023) on the hydroweb.next interface.
Global coverage of THEIA lake and river water level products over the full time period (1992-2023) on the hydroweb.next interface.
Zoom in on the world map of hydroweb data, with the river legend displayed on the hydroweb.next interface.
Zoom in on the world map with the river legend displayed on the hydroweb.next interface.

A new interface making it possible to cross-reference data

An overlay period between the historical dissemination portal and this new portal will be provided until 31 March 2024 to allow you to adapt to this change. After this date, the URL hydroweb.theia-land.fr will no longer be accessible.

This change has two main objectives :

  • to deal with the obsolescence of the historical platform and
  • to propose the grouping of these water level data with other hydrological products, which will be available very soon (products from the SWOT mission, water surface and water quality products), as well as other future products useful to the hydrology community (in situ data, etc.).

The principle remains the same, authentication with your THEIA account is required to download the products. New features are available, such as the ability to display several stations on the same graph.

Graphic display of measurements from three virtual stations on the Tagus river on the hydroweb.next interface.
Graphic display of measurements from three virtual stations on the Tagus river on the hydroweb.next interface.

A tutorial to support users

You’ll find all the information you need to use the new interface in this tutorial:

However, some of Hydroweb’s existing functions will not be available until spring 2024 (search by basin, river, lake and display of catchment areas). So please be patient!

We let you discover this new portal and do not hesitate to send us your feedback to improve your user experience.

If you have any questions about connection and data distribution, please contact: exp.hysope2@cnes.fr
For any questions about Hydroweb altimetry data, the contact point remains the same: contact.hydroweb@groupcls.com

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