You can see on the picture up above the window that opens when you use the 'r.profile' function. As indicated in the name of the function, this functionality must be applicated on a raster map. We used here the raster elevation map of the Banquet Gorges in France, near Mazamet (taken from IGN data). Then, we plotted four segments on the map (A, B, C and D), and the four elevation profiles corresponding to these segments appeared on the right side of the screen. All these actions are very easy, as there is a dialog box in the top left corner of the screen guiding you.
The profiles given by Grass5 on the screen are not precise enough. But it is possible to put these profiles into text files, and then to plot them using the appropriate software (Gnuplot, xmgr...). On the x-axis, the distance on the segment is plotte
Then, we can have a very precise view of the four profiles, and a better visualization of the valley.
The conference menu - Getting information - GIS market - Grass anatomy - r.profile function - r.watershed function - Computed waterlines - Screenshots