Table 2. National databases used to describe the landscape covering the FBBS squares.
| Database | Spatial objects | Attributes | Time interval | Planimetric accuracy | Source | Provider |
|---|---|---|---|---|---|---|
| Land Parcel Identification System 2007–2010 | Polygons corresponding to at least one field with annual or permanent or ligneous crops | Crops (28 classes) and their area in each polygon | Each year | A few meters | Declaration by farmers | Agence de Services et de Paiements |
| http://www.asp-public.fr | ||||||
| CORINE Land Cover 2006 | Polygons | 44 land cover classes | 2006 ± 1 year | Less than 100 m | Satellite | European Environment Agency |
| http://www.eea.europa.eu | ||||||
| BD Topo®, vegetation and road layers | Polygons (vegetation) and polylines (roads) | 1 class for trees | Between 1999 and 2007 | 5 m | Orthophotography | Institut Géographique National |
| 5 classes for roads | http://www.ign.fr |