[GRASS-user] about r.out.GMT

Dylan Beaudette dylan.beaudette at gmail.com
Fri Oct 20 14:20:05 EDT 2006

On Friday 20 October 2006 02:28, Huidae Cho wrote:
> On Fri, Oct 20, 2006 at 10:22:27AM +0200, mrigotti at agrsci.unibo.it wrote:
> > Hi,
> >
> > I have some issues using the r.out.GMT addons, using grass63-cvs.
> > Basically, the addons works, and I get two files, a file.grd a file.cpt,
> > which I use with the following commands to directly display with GMT
> > (4.1.2):
> >
> > grdimage file.grd -R689000/710000/4895000/4920000 -Jx1:100 -Cfile.cpt -P
> > -V
> >
> > >map.ps
> >
> > Unfortunately, I then get this error message:
> >
> > grdimage: Allocates memory and read data file
> > grdimage: Not a netCDF file [slp_GMT.grd]
> >
> > I was wondering why this happens, given that the addons should produce a
> > compatible grd file to be used with GMT.
> > Is it that I'm missing something? Can you help me?
> You need to add a map type to the file name.  If the original map is in
> CELL format, "grdimage file.grd=2 ...", otherwise "gridimage file.grd=1
> ..." is correct.
> > By the way, I also used v.out.GMT, aand it works fine, except for the
> > fact that I got a compatibility error message, which was solved after I
> > deleted the first line of the xy file produced by the addons, which only
> > contained the '>' character.
> v.out.gmt supports multiple polylines using the '>' flag.  You have to
> specify -M option for psxy to work.
> If you're not sure, use -p flag when running [rv].out.gmt to see GMT
> commands.
> Huidae
> > Hope you can help,
> > thanks,
> > Marco
> >

Nice to see that there has been some development in connecting GRASS and GMT . 
I have some updates for the r.out.gmt script which make the output grid files 
directly readable by all GMT apps. Perhaps Hamish and I can work out a good 
time to merge the changes. As far as I know, there are still some issues with 
the automatic creation of CPT files, used by GMT for color lookup.

I wasn't aware of the v.out.GMT script - I will have to take a look, as it is 
something that I have been meaning to do for quite some time now. 

I'll post back with details once my changes are merged into the r.out.gmt 


Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis

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