Dataset Direct Download Service (WFS): 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).本动态制图的可视数据围绕索姆省（Somme）径流轴研究展开地形地貌分析。据此，索姆省领土与海洋事务局已完成径流路径与流域的划定工作，成果以矢量产品（vector-type product）和栅格图像（raster image）形式呈现。 流域（面积大于10公顷）：为清晰划定辖区内的河流水系格局，需将流域细分为若干次级子流域单元。此类地表要素的划定涵盖水域分界或流域边界线。 本建模基于高程点网格构建的数值场模型开展地形测绘：该网格在X、Y方向每25米布设一个点栅格，Z方向高程精度达1米，属于法国国家地理研究院（IGN）高程数据库标准类型。