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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
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nces (https://comses.net)
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> 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
:kratocha...@gmail.com>>
To: Michael Barton mailto:michael.bar...@asu.edu>>
Cc: GRASS developers
mailto:grass-...@lists.osgeo.org>>, GRASS user list
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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 wo
Hi Ricardo,
It is hard to tell what is going from without looking at your input
file, but you do seem to using r.cost correctly. My guess would be
that the differences between cells are not great enough to cause the
cost surface to deviate from a linear trajectory. To test this, try
using r.mapcalc
Hello
I'm trying to built a cost surface. I've already built a raster with the
pixel cost, but i can´t get the cost that is required to arrive to point A.
I'm trying - "r.cost input=r_v...@12_03 output=exp
start_rast=h_r...@12_03max_cost=0 percent_memory=100" but it takes a
lot of time and the re
