ilto:grass-user-requ...@lists.osgeo.org>
wrote:
Date: Wed, 29 Nov 2023 10:17:19 -0500
From: Anna Petr??ov? mailto:kratocha...@gmail.com>>
To: Michael Barton mailto:michael.bar...@asu.edu>>
Cc: GRASS developers
mailto:grass-...@lists.osgeo.org>>, GRASS user list
mailto:gras
nces (https://comses.net)
>
> personal website: http://www.public.asu.edu/~cmbarton
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>
> On Nov 29, 2023, at 1:00 PM, grass-user-requ...@lists.osgeo.org wrote:
>
> Date: Wed, 29 Nov 2023 10:17:19 -0500
> From: Anna Petr??ov?
> To: Michael Barton
> Cc: GRASS develop
ailto:kratocha...@gmail.com>>
To: Michael Barton mailto:michael.bar...@asu.edu>>
Cc: GRASS developers
mailto:grass-...@lists.osgeo.org>>, GRASS user list
mailto:grass-user@lists.osgeo.org>>
Subject: Re: [GRASS-user] cost surface with negative friction odd
behavior
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mail
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
