You can see on the picture a map plotted with the 3D visualization tool NVIZ. This raster map represents a region aroud Mazamet in France (IGN data), divided into 5 principal watersheds. We will describe how to obtain such a picture:

The green watershed is the Thoré watershed; the yellow one is the Banquet watershed, where we can see the Gorges we studied with 'r.profile' just before. The blue watershed corresponds to the Arnette one. These three watersheds meet just before Mazamet, and the third one (in pink) represents the watershed down Mazamet. These watersheds are in the Atlantic basin, while the grey one (at the top of the map, close to Saint-Pons) is in the Mediteranean one.

The conference menu - Getting information - GIS market - Grass anatomy - r.profile function - r.watershed function - Computed waterlines - Screenshots