Theia innovates for the processing and dissemination of hydrological data

Flavien GOUILLON & Lionel ZAWADZKI from CNES gave an update on the evolution of the Theia data and services infrastructure to meet the needs of hydrological data processing and dissemination. A thematic portal,, and a new processing centre, HYMOTEP, are ready to be opened soon. Almost Ready for SWOT is the hydrological web portal of the THEIA continental surface thematic consortium. This portal, financed initially by the SWOT-Aval downstream programme and then by THEIA, aims to facilitate access to multi-sensor and multi-source (i.e. in-situ, model, satellite) hydrological data.

The objective is to centralise a maximum of hydrological data and to provide advanced functions, in particular to search, compare, extract and manipulate these data. Note that will be one of two portals, along with that of NASA’s Jet Propulsion Laboratory (JPL), to disseminate the hydrological data of the SWOT mission, which is due to be launched next December.

Screenshot of the forthcoming interface
To contact us and take part in its development:

Ergonomic, intuitive, built with users The development of started a little less than a year ago. Thanks to the collaboration of many users, hydroweb. next now offers an ergonomic and intuitive interface. It is already possible to search, view and download a number of data, including the simulated SWOT data. The aim is to have the portal open to beta testers for the first time in March to April 2022. This will be used to gather user feedback to further improve A wider opening is planned for mid-2022.

A presentation (in French) is available.

HYMOTEP: Producing for Hydrology, but not only

Feel free to contact us and learn more:

A production centre for hydrology within THEIA is being built: HYMOTEP, for HYsope II iMplementation Of TrEatments and Production. The main objective of this centre is to realise the hydrological production plans of the THEIA continental surface data consortium. It should also, in the long term, offer a replacement solution for the Muscate production workshop, which produces the production plans for the other THEIA themes (i.e. vegetation).

HYMOTEP will allow a run-of-the-mill production of continental hydrology products (i.e. acquisition of input data, activation of scientific chains, and provision of the generated products for subsequent dissemination on the portal).

The centre will host products from hydrological chains such as LIS (snow), SurfWater (water surface) and Obs2Co (water quality/temperature), as well as the upstream chains necessary for these productions (S1-tiling, MAJA). The objective is to move towards continental coverage to meet the CAL/VAL needs of future missions including SWOT.


Lionel Zawadzki

Lionel Zawadzki

Ambitious production objectives for the coming year

The development of HYMOTEP began in October 2021. It is now able to generate products from MAJA and the LIS chain and soon SurfWater on a day-to-day basis in well-defined areas. The goal is to have day-to-day on all the chains mentioned in the summer of 2022, with active supervision by the operators of the production activities and consolidated metrics on the availability of HYMOTEP.

Cover photo credit: Istanbul and the Bosphorus under snow on 24 January 2022, Copernicus Sentinel-2 imagery.

Read THEIA Bulletin n°16

>>> Dowload PDF version
>>> Read on Calaméo

>>> Read older issues

More news

A World Glacier Atlas to understand glacier mechanisms in a global warming context

The 3 glacier products available on Theia offer an unprecedented global overview of the evolution of glaciers.

Land cover Theia product update

Like every year at this time, you’re invited to discover the new version of the OSO product, from the S.E.C Land cover. The 2022 version was released a few days […]

Summer 2022: feedback on the impact of drought on snow in French high mountain nature parks 

A focus on snowmaking in the core areas of the four French high mountain National Parks: Pyrenees, Vanoise, Ecrins, Mercantour.