THEIA OSO 2020 product: new land cover map


The new OSO map at 10 m spatial resolution is available with 23 classes for the year 2020. The OSO product provides maps at the national level with an annual update frequency.

Knowledge of soil coverage is essential both as an object of study (land use planning, carbon cycle), but also as a requirement for satellite image analyses focusing on specific land cover classes (monitoring of agricultural vegetation for irrigation needs and crop yield forecasts). The availability of Sentinel-2 time series makes it possible to consider an annual production of land cover over France, with a moderate level of detail (15 to 20 classes), and a resolution of 10 to 20 meters.

The Scientific Expertise Centre “Land Cover SEC” brings together teams from Cesbio, UMR Ispa, Dynafor, CNRM, UMR Tetis, IGNMatis, Costel and Sertit whose common objective is to define and develop automatic algorithms for the production of land use maps from satellite imagery.

The 2020 vintage year

The Vintage of the year 2020 was realized from Sentinel L2A 2020 France data entirely produced by the THEIA cluster. This year, the focus was on renewing the sample set of natural classes (bare soil, grass, moor, forest) from the updated official databases (BD Topo of IGN and Corine Land Cover).

The production of the OSO 2020 product was carried out at CNES (DNO/OT/PE service) with preparation of the training data and validation by CESBIO, using the iota² processing chain developed at CESBIO with the help of CNES and CS GROUP.

Like all previous vintages, the 2020 vintage is freely available on The RASTER format (whole France in tif format) is available. The VECTOR format (division by department in shapefile format) will be available by the end of the year (distribution in progress). The maps will also be available on the THEIA map server: MAPS.

This product uses the following nomenclature:

– Annual crops
– Summer crops
1. Sunflower
2. Corn
3. Rice
4. Tubers / Roots
5. Soybean
– Winter crop
6. Straw cereals (Wheat, Triticale, Barley)
7. Protein crops (Beans / Peas)
8. Oilseeds (Rapeseed) – Natural low formation
– Low natural formation
 14. Grasslands and natural pastures
15. Woody heath– Urban
16. Dense built-up area
17. Diffuse built-up area
18. Industrial and commercial areas
19. Roads
– Perennial crops
9. Grasslands
10. Vineyards
11. Orchards and arboriculture
– Forestry
12. Hardwood forest
13. Softwood forest – Mineral surfaces
– Mineral surfaces
20. Natural mineral surfaces 21. Beaches and dunes
– Other
22. Water
23. Glaciers and eternal snows

➡️ More information on the THEIA “Land cover SEC” CES page


Silvia Valero Cesbio Google Scholar @S.Valero
Vincent Thierion INRAE | CESBIO @V.Thierion