Le portail francophone de la géomatique

Bonjour,

- r.water.outlet qui construit des bassins à partir d'un exutoire (point) et d'un fichier de drainage (issu, par exemple, de r.watersheds)

Christine

Concernant SAGA, les modules se trouvent dans Terrain Analysis>Channels mais il me semble qu'il ne construit que des ss-BV topographiques (c'est-à-dire dérivés aux confluences) et non à partir d'un exutoire.

D-Infinity Contributing Area

Calculates a grid of specific catchment area which is the contributing area per unit contour length using the multiple flow direction D-infinity approach. D-infinity flow direction is defined as steepest downward slope on planar triangular facets on a block centered grid. The contribution at each grid cell is taken as the grid cell length (or when the optional weight grid input is used, from the weight grid). The contributing area of each grid cell is then taken as its own contribution plus the contribution from upslope neighbors that have some fraction draining to it according to the D-infinity flow model. The flow from each cell either all drains to one neighbor, if the angle falls along a cardinal (0, pi/2, pi, 3pi/2) or ordinal (pi/4, 3pi/4, 5pi/4, 7pi/4) direction, or is on an angle falling between the direct angle to two adjacent neighbors. In the latter case the flow is proportioned between these two neighbor cells according to how close the flow direction angle is to the direct angle to those cells. The contour length used here is the grid cell size. The resulting units of the specific catchment area are length units the same as those of the grid cell size.

Input_Outlets_Shapefile__must_be__shp_ (Optional)
A point shapefile defining the outlets of interest. If this input file is used, only the cells upslope of these outlet cells are considered to be within the domain being evaluated.