[GRASS-user] problems with r.cost

[Jerry Nelson]

One thing to try if you haven't already is to recompile grass with large
file support included. I don't know why that's not done automatically but
apparently it isn't.

Another, if region size is really the issue and you are a C programmer or
know one, is to modify the make file of a grass add-on called r.terracost.
It was written as a CS project at Bowdoin at a time when grass was at
version 5.3. With the move to version 6, the make process changed slightly.
The r.terracost files are available at
http://www.bowdoin.edu/~ltoma/research.html

Or you could get grass5.3 and run r.terracost with it.

Regards, Jerry

-----Original Message-----
From: grassuser-bounces at grass.itc.it [mailto:grassuser-bounces at grass.itc.it]
On Behalf Of Paul Haverkamp
Sent: Wednesday, May 23, 2007 12:45 PM
To: Hamish
Cc: grassuser at grass.itc.it
Subject: Re: [GRASS-user] problems with r.cost


Hi Hamish,

Thanks for getting back to me.

I am using 6.2.1, and g.region -p gives the info:

projection: 1 (UTM)
zone:       10
datum:      nad83
ellipsoid:  grs80
north:      4269999
south:      4180119
west:       598614
east:       651978
nsres:      3
ewres:      3
rows:       29960
cols:       17788
cells:      532928480

I'm trying to run with the resolution of 3m, but when I change it to 30m,
there isn't a problem.  Using much smaller regions doesn't seem to have
this problem.  So is the file just too large at too small of a resolution?
 I'll try to run Spearfish and let you know.

thanks again,

paul


> Paul Haverkamp wrote:
> > 
> > i'm a very new user to grass and am using r.cost in grass6.2.  i'm
> > trying to run a cost analysis on my raster and having some difficulty.
> 
> which version of 6.2? 6.2.0 or 6.2.1?
> 
> how big is your region? (g.region -p) Does it happen if you make the
> region smaller or adjust the resolution?
> 
> can you reproduce it using the Spearfish demo dataset? if so, can you
> post instructions with that in the grass bug tracker?
> 
> 
> thanks,
> Hamish
> 

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