Description

The OCS GE (large-scale land cover) repository is a vector database describing land cover and land use for the entire metropolitan area and the overseas departments and regions (DROM). Its model has two dimensions: it separates land use from land use (see precise nomenclature). The geometric accuracy of the OCSGE is metric and is based on the RGE®. Its information comes mainly from aerial photographs updated every three years, and it therefore has a temporal consistency with them. Successive vintages make it possible to quantify and qualify changes in the soil surface. By 2025, the new generation GE SCO – financed by the Directorate-General for Planning, Housing and Nature (DGALN) of the Ministry of Ecological Transition and Territorial Cohesion – will offer complete coverage of the national territory in at least two vintages. It is a core data layer, which can be enriched if necessary at refined thematic levels to take into account local specificities and respond to specific needs. As part of the artificialization observatory, IGN is carrying out work that optimizes the current production chain in order to achieve the greatest possible automation. The aim is to meet two objectives: • a significant reduction in costs, minimising the share of human photo-interpretation, • and a significant reduction in production times making it possible to produce 1/3 of France every year under cruising conditions. This is done by using artificial intelligence (AI) processes such as ‘deep learning’. The GE SCO production chain is based on an infrastructure with significant computing capacities and storage space to host and process large data. This database will be crucial for monitoring artificialisation and achieving net zero artificialisation by 2050, as set out in the ‘Climate and Resilience’ law of 22 August 2021. Further information is available on the Artificialisation Portal. The BD OCS GE N-G is based on the national nomenclature recommended by the National Geographical Information Council (CNIG), developed by the Centre d’études et d’expertise sur les risques, l’environnement, la mobilité et l’aménagement (CEREMA), under the supervision of the Ministry for Ecology, Sustainable Development and Energy (MEDDE.DGALN). The BD OCS GE complies with the national production recommendations that accompany the national nomenclature. It is based on an intermediate data layer, the national reference system for the main networks constituting the ‘National Ossature’. It has four main functions: • ensure geographical continuity between territories; • ensure a reference geometry; • partition territories homogeneously; • ensure spatial cohesion between territorial scales. OPenIG makes available in shapefile format the OCS GE comic for Lozère and the associated documentation. In addition, the IGN provides a user guide designed to facilitate the understanding and use of GE SCO data, presented here at the level of the national pillar. The first section provides a detailed description of the GE OCS and its characteristics, the second presents how these data can be exploited by geomaticians using QGIS software. Each party may be consulted independently. Here is the link to access this guide: https://storymaps.arcgis.com/stories/193550c4e4af4f92845201d74ca8a002

Resources

Name	Format	Description	Link
	57		https://www.data.gouv.fr/api/1/datasets/r/f29e0c58-e2d7-4f3c-ad67-ade9374e8135
	33		https://www.data.gouv.fr/api/1/datasets/r/677d4733-6d3c-4b0d-a065-93ee34290ce1
	33		https://www.data.gouv.fr/api/1/datasets/r/5dfd0cf8-aa4e-439f-8546-fdfa29797805
	57		https://www.data.gouv.fr/api/1/datasets/r/c71f3eb1-13cf-4a89-85e2-ac1ee32c88eb
	33		https://www.data.gouv.fr/api/1/datasets/r/f208ab2e-52b5-458d-a6d0-1755bd7977e1
	57		https://www.data.gouv.fr/api/1/datasets/r/75805c2d-d7a1-4ebf-9039-aab3c2a7efa2

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