This a 3D picutre extracted from a visual output of matisse rubens (in greyscale, at the upper right). A smoother one could be obtained after more post processing

Some pictures showing  the precision available from NVIZ. Both pictures are taken 200 m over Mazamet. The first 'retenue sur l'Arnette' is a view to the south, the second is a view to the west. The slight errors between flowlines and elevation raster can be seen on the left picture.

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