All of these metropolitan and overseas cities (are now available in Pléiades Neo, constituting a repository for future prospective studies. These municipalities must regularly map threatened areas to serve as the basis for new rules including home relocations, building bans and coastal developments. Regular satellite mapping of the coasts makes it possible to identify points of vulnerability and their evolution, especially after a devastating storm. These measures contribute to impact studies on the environment but also on the living environment and on economic, tourist and maritime activities. See below: