[GRASS-user] Question about least cost path

[johannnes83]

Dear All, 

I am using least cost path to model migration of wildlife through the
landscape. In my understanding from what I have read on this list and in the
grass manual I do the following steps:

1.) r.walk or r.cost for the cost distance.
2.) r.drain where the starting point is the end point from the cost
distance.

However, how do I overcome a local minimum (valleys) with r.drain?

Any hints would be appreciated.

Thanks Johannes 
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