Re: [GRASS-dev] [GRASS-user] cost surface with negative friction odd behavior

Done _ C. Michael Barton Associate Director, School of Complex Adaptive Systems (https://scas.asu.edu) Professor, School of Human Evolution & Social Change (https://shesc.asu.edu) Director, Center for Social Dynamics & Complexity

Re: [GRASS-dev] [GRASS-user] cost surface with negative friction odd behavior

Michael, could you please create a PR for the documentation? On Wed, Nov 29, 2023 at 3:56 PM Michael Barton via grass-user < grass-u...@lists.osgeo.org> wrote: > Thanks Anna and Doug, > > I did not expect it to work (thought it would be useful if it did). Rather > I was surprised by the fact

Re: [GRASS-dev] [GRASS-user] cost surface with negative friction odd behavior

I think r.walk was not written for negative friction and while I imagine some small (in absolute sense) negative values may work, your negative values are pretty extreme, meaning the resulting travel time through a cell would be negative. That can cause all kinds of issues in the algorithm. So I