Theia

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

World Water Quality: a portal developed for UNESCO, based on a demonstrator on Lake Chad

Theia Colours of the Continental Waters SEC has produced with Magellium a demonstrator based on data from the Lake Chad portal on the quality of continental waters.

GEOV2-AVHRR: 2020 data now available

The GEOV2-AVHRR product has been updated for the year 2020. There are now 39 years of global vegetation change data available. 

Monitoring of Land Soil Sealing by Remote-Sensing

Discover the work on soil sealing carried out by the TETIS team within Theia Urban SEC. And in particular the new product broadcast on Theia: “Buildings footprint”.

Events

But also

Providing key information for environmental studies to document changes and trends

Meet with Silvia Valero, the new facilitator for Theia Land Cover SEC. She shares here her ambitions and expectations.

Just Released: Theia Bulletin n°15

Read the new Theia Bulletin with all the network news, a selection of focuses on products and much more.

[POSTDOC]THE POTENTIAL OF EARTH OBSERVATION (EO) TO STUDY BIODIVERSITY IN INTERTIDAL ECOSYSTEMS

Postdoc position in Remote Sensing & Benthic Ecology, University of Nantes (France) The position is for 16 months, and should start in January 2022. Summary The postdoc will work on […]

OSS-NC 21: Connecting Regional Geomatics Communities in Pacific

Learn more on the coming New Caledonian event and its relevance for the Remote-Sensing Pacific Community at large

Pan-European High-Resolution Snow & Ice Monitoring Product.

Register now to the upcoming online launch event for the Pan European High Resolution Snow & Ice Monitoring Product.

Half VHRS Soil Moisture series updated

Up to 10 series documenting soil moisture at plot-level every six days have been recently updated.

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