The Outdoor Accommodation Occupancy Survey allows the cyclical observation of occupancy for Outdoor Accommodation in volume and in terms of structure of the clientele ( geographical origin). It assures besides an exhaustive knowledge of the stock. Realized from May till September every year since 1981, it covers a sample of 8 000 campsites, offering at least a place of passage, classified from 1 to 5 stars situated in metropolitan France.