[GRASS-user] r.sim.water & time-stepped walkers - additional info

M S mseibel at gmail.com
Wed May 16 12:15:58 EDT 2007

Followup info:

Here is the actual error message when trying to draw the walker output that
only has one point, "GRASS_INFO_ERROR(26696,1): Cannot open old vector
swwalkers401799 at PERMANENT on level 2"

thought that might be useful info?


On 5/16/07, M S <mseibel at gmail.com> wrote:
> I am still investigating the outputs of various simulations I ran, and may
> eventually answer my own question.  However, I am hoping someone with
> experience using this module can provide some insight or guidance.
> First off, the r.sim.water is very cool!  Especially an animation sequence
> of walkers I saw in a document online by Helena Mitasova (http://www.ing.unitn.it/~grass/conferences/GRASS2002/proceedings/proceedings/pdfs/Mitasova_Helena_2.pdf
> <http://www.ing.unitn.it/%7Egrass/conferences/GRASS2002/proceedings/proceedings/pdfs/Mitasova_Helena_2.pdf>)
> that referenced this gif animation: (
> http://skagit.meas.ncsu.edu/%7Ejaroslav/centennial/anim/walkers.gif)
> However, under various simulations I am getting no walker output for some
> time steps through the simulation.  Also, if the simulation is not
> time-stepped no walkers are outputted.  Using v.info I am getting one
> point for walker output.  If I step through the simulation 10 times, I get
> walker output on the 1st step, the 9th and 10th step, and only one walker
> point for all the other steps.  In other simulations that had 8 steps, I
> might have gotten walker output for 2 of the 8 steps.
> I am still tuning the input parameters and checking results.  If anyone
> has some suggestions relating to this issue I would greatly appreciate it!
> Thanks,
> Mark
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