Map visualisation service (WMS) of the dataset: PPRL Pays des Olonnes — Current reference rates for flood and marine submersion risks of the Pays des Olonnes — Vendée

The reference rating corresponds to the altitude of the body of water modeled at the right of an existing project or construction. It is displayed in m NGF-IGN 69, i.e. in meters in the official grading network in metropolitan France which is attached to the Marseille tide gauge. The reference rating therefore does not correspond to a water height but rather to the altimetry of the water body. The water height corresponds to the difference between the reference rating and the altimetry rating of the natural terrain.