Map Viewing Service (WMS) of the dataset: Underwater basin of the 80 from MNT RGE of 25 m with correction of areas less than 10 ha

The visually visible data on this dynamic mapping describe an analysis of the topographic terrain for the study of runoff axes in the Somme department. Thus, the departmental directorate of the territories and the sea of the Somme has carried out the route of runoff and river basins, in the form of a vector-type product and raster image. Watersheds (surface more than 10 hectares): they represent the subdivision of watersheds into subsectors in order to delineate the river system of the territory. This delineation of surface elements including the boundary lines for the sharing of waters or basin boundaries. The modeling is based on a topographic survey from the numerical field model carried out on an altimeter point mesh consisting of a point grid every 25 metres in X and Y, precision 1 m in Z (the IGN alti database type).