The object of the contract is the production of digital terrain models (DEM) of precision over more than 3,000 km 2 . Different services are expected (surveying, filtering, etc.) The surface area of the areas to be covered represents approximately 3,009 km 2 spread over the Auvergne-Rhône-Alpes region represented on the map in appendix 1 of the CCTP. The exact contours of the sectors are given to the candidate in shapefile format. The dense and precise airborne topographic survey should make it possible to establish DEMs with a resolution of 50 cm.

Realization of digital terrain models (DEM) of precision over more than 3,000 km 2 .