[GRASS-user] Automatic extraction of valley features

Jean-Roc Morreale jr.morreale at enoreth.net
Thu Nov 12 02:09:48 PST 2015


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 :

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.


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