[GRASS-dev] call for sample dataset: r.hydro.CASC2D

[Helena Mitasova]

Have you tried 30m DEM in spearfish? I used to run it on it but it  
was problematic.
The code needs a very smooth DEM and a very small time step to avoid  
crashing.
It should be able to handle depressions (water fills them and flows  
out) as simwe does,
but the time step needs to be small (seconds or so, depending on  
resolution).

Or try it first on a very small, simple watershed - e.g. in nc_spm
set region to

g.region rural_1m
g.region s=s+290 res=2   (this will pick up only upper part of the  
watershed without the road)
and run it with elev_lid792_2m.
We have both rainfall data and continuous monitoring set up there and  
there is an example for
it for r.sim.water in GRASSbook so you can compare the results.

If you want to try it for a larger area with lower resolution try the  
500m DEM
elev_state_500m for a smaller subset south of rural_1m. That may be  
actually easier
to run because you don't need such a small time step.
Or whatever you have tried it with - run it with smaller time step  
and smooth your DEM
and you may be able to get it running. Running it with SRTM data may  
be a challenge
(smoothing may help).

I have found some animations of the results (I think this was run at  
90m resolution and
a very small raster by todays standards) but I don't have those data  
any more:
http://skagit.meas.ncsu.edu/~helena/gmslab/viz97/brown/doc/movies/ 
xganim.mpg
http://skagit.meas.ncsu.edu/~helena/gmslab/viz//movies/gage.mpg

Helena




On May 8, 2008, at 8:02 PM, Yann Chemin wrote:

> Hi,
>
> I would like to test a bit more r.hydro.CASC2D with GRASS-7.0-SVN  
> code,
> does anybody have a sample dataset sleeping somewhere that is known to
> work well with that module?
>
> Thanks,
> Yann
>
> -- 
> Yann Chemin
> International Rice Research Institute
> Office: http://www.irri.org/gis
> Perso: http://www.freewebs.com/ychemin
> _______________________________________________
> grass-dev mailing list
> grass-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-dev