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

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.

SPace4Irrig | Mapping of irrigated and non-irrigated crops

Within the framework of the SPace4Irrig project, labelled Space Climate Observatory,CESBIO and MEOSS have developed a detection model for irrigated and non-irrigated plots, adapted to field crops. This project is […]

April 23-28, 2023 | Data Terra and Theia at EGU

The General Assembly of the EGU 2023, gathering all the scientists of the life of the Earth, will be held in Vienna (Austria) from April 23 to 28. DATA TERRA’s […]


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


VENµS M5 reflectance products are now available through Theia with over 100 documented sites worldwide.

[Thesis] Water quality variability by multi-sensors remote sensing in an Inland water/estuarine/deltaic environments.

The Laboratory of Oceanography and Geoscience (LOG) of the University of Littoral Côte d’Opale (ULCO) is looking for a PhD candidate on the topic of water quality variability by multi-sensor […]

Post-doctoral position (10 months) | Artificial Intelligence; Multiscale analysis

This project is multidisciplinary and focuses on the development of new non-linear multiscale Deep Learning models for super-resolution of remote sensing images of Land Surface Temperature. Keywords Artificial Intelligence; Neural […]


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.