Value-Adding Products and Algorithms for Land Surfaces

Theia at a glance

Theia is pursuing four main objectives :

  1. Promoting and facilitating the use of space data, for science and public
    actors, in terms of  imagery, added-value products as well as in-situ data;
  2. Developing added -value products and services for the science communities
    and national public actors;
  3. Developing networks of competences
  4. Supporting French realizations at European and international level.

Observing Earth

Theia is now one of the active members of the Earth System Research Infrastructure, Data Terra.

Along, three other French Earth Observation consortia:

  • Aeris – the French thematic consortium on Atmosphere
  • ForM@Ter – the French thematic consortium on Solid Earth
  • Odatis – the French Thematic consortium on Ocean spatial observation.
  • and Dinamis, the French pooled system for access to satellite imagery.

Theia in images

Theia offers monthly surface reflectance syntheses for the Iberian peninsula. Here a synthesis of cloudless observations over 45 days for the month of August 2019. Theia offers monthly surface reflectance syntheses for Metropolitan France. Here a synthesis of cloudless observations over 45 days for the month of September 2019. Theia offers monthly surface reflectance syntheses for the Italian peninsula. Here a synthesis of cloudless observations over 45 days for the month of September 2019. Localisation of all Hydroweb virtual stations in November 2020 Theia Hydroweb product documenting the level of lakes and rivers. Here the Loire River (France) variations from 2008 to 2019 The product Theia Inland Water Quality measures, among other things, the level of suspended solids. Here in the Rhône at Arles in December 2016. Soil moisture measured by SMOS-IC, summer 2017 Soil moisture measured by SMOS-IC, summer 2018 Gabon biomass map with a 50x50m resolution, Above-ground biomass map of of the savannahs and woodlands of continental Africa and Madagascar at a resolution of 50m x 50m. This DHI mapping is designed for biodiversity assessment and for describing the natural habitats of different species. Artist's view of a β diversity mapping obtained with the application of biodivMapR on an area of the Peruvian Amazon. Theia product presenting the irrigated crops in 2015 in the South-West of France. Produced from 13 LANDSAT8 level 2A images. Carte d'humidité du sol à THRS à l'échelle parcellaire pour la région d'Arles. Binary "urban/non-urban" classification obtained from Sentinel-2 images for the city of Brussels in 2018. Binary "urban/non-urban" classification obtained from Sentinel-2 images for the city of Perpignan 2018. Binary "urban/non-urban" classification obtained from Sentinel-2 images for the city of Strasbourg 2018. Theia Land Cover for Metropolitan France, 2018. 23 classes. Available both at raster et vector formats. Theia 2018 Land Cover Product for Lot-et-Garonne region (France) Theia Land Cover Product for Paris (France) 2018 Theia Reunion Land Cover Product distinguishes 11 classes of land uses. Produced by synthesis of Sentinel-2 and Spot-6 data, its resolution is 1,5 m. Map of the snow coverage in the Pyrenees during a hydrological year (1 September 2016 to 31 August 2017) produced by synthesis of Theia snow-covered surface products. Theia L2-Snow Product detects the presence of snow (in blue) and cloud (in white). Cartography of annual snow coverage for the Alps in number of days between 1st of September and 20 of January for the years 2017, 2018, 2019. Advancing ice front, Quirlies and St-Sorlin glaciers. Spot 6-7. 2014-2019. Mapping Tiger Mosquitoes risk in Montpellier (France). Senegal - Spatial distribution of mosquitoes carrying Rift Valley Fever GeoV2 FCover, October 2019

Latest news


In partnership with OpenIG, two new tutorials on the use of Theia Snow products are now available.

GEOV2-AVHRR: the 2021 version is available

The GEOV2-AVHRR product has been updated for the year 2021. This means that 40 years of global vegetation data are now available. 

Theia Sentinel Products are back

We are happy to announce that Theia Sentinel-using products are back into production.


Summer School Developing the Use of SENTINEL Satellite Constellation for Monitoring of Inland Water Quality

For the second year, Theia Colours of Continental Waters SEC team is proposing a summer school on the monitoring of the colour and quality of continental waters. The training will be held in English, from 5 to 9 June 2023, at the Geosciences Environment Toulouse laboratory (Observatoire Midi-Pyrénées, Toulouse, France).

But also


The processing of some Theia products is suspended during the migration of the ECMWF data centre.

Digital Soil Mapping: educational resources and property maps

Theia Digital Mapping SEC offers new educational resources and Soil Properties Maps.

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.

TropiSCO: Monitoring Forest Cover Loss in Dense Forests

The Tropisco projects build on methods developed in THEIA Forest Biomass and Cover Change SEC.

Using satellite imagery to establish a link between the environment, the habitats that are favourable to these species, and the human and animal populations at risk

Annelise TRAN, CIRAD researcher and THEIA Risks associated with Infectious Diseases SEC, shares her vision of Theia consortium, its achievements as well as the challenges ahead.

Huge Success for the French-Lebanese Summer School on Remote Sensing

Theia-AUB Summer School in Beirut has been a huge success. All presentation and teaching material are now on-line.