[GRASS-user] Automatic extraction of valley features

[Jean-Roc Morreale]

Hi,

I would like to know how to extract a valley feature from a DEM as a 
polygon : the wanted result isn't equal to a watershed or a sub-basin, 
it is the cumulated shape of the two slopes and the bottom where the 
stream is located.

As I do not master the geomorphological vocabulary, here is a image 
showing the desired outcome :
https://drive.google.com/open?id=0B1sJg8zddqSPUk9BcTdncVRNNHc

I'm using GRASS7, I've tried r.watershed and several r.stream.* modules 
but my lack of knowledge in this domain is blocking. The elevation data 
used is the EU-DEM.

Regards,
Jean-Roc