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

[Markus Neteler]

Mark,

could you
- post the entire command line?
- maybe post an example for Spearfish (way easier to reproduce for us)? 

Markus

On Wed, May 16, 2007 at 11:15:58AM -0500, M S wrote:
>    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?
> 
>    Mark
> 
>    On 5/16/07, M S <[1]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 (
>      [2]http://www.ing.unitn.it/~grass/conferences/GRASS2002/proceedings/proceedings/pdfs/Mitasova_Helena_2.pdf
>      ) that referenced this gif animation:
>      ([3]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 [4]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
> 
> References
> 
>    Visible links
>    1. mailto:mseibel at gmail.com
>    2. http://www.ing.unitn.it/%7Egrass/conferences/GRASS2002/proceedings/proceedings/pdfs/Mitasova_Helena_2.pdf
>    3. http://skagit.meas.ncsu.edu/%7Ejaroslav/centennial/anim/walkers.gif
>    4. http://v.info/

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-- 
Markus Neteler  <neteler itc it>  http://mpa.itc.it/markus/
FBK-irst -  Centro per la Ricerca Scientifica e Tecnologica
MPBA - Predictive Models for Biol. & Environ. Data Analysis
Via Sommarive, 18        -       38050 Povo (Trento), Italy