[GRASS5] Problem converting NAD27 to NAD83 - missing ntv1_can.dat

[Brad Douglas]

On Thu, 2005-04-07 at 12:40 -0600, Craig Funk wrote:
> >
> > The most common cause for that error is that the points you are trying 
> > to re-project fall outside the area covered by the datum shift grid 
> > file (ntv1_can.dat). Are you sure it is the correct file for your area 
> > (Canada).
> >
> > If you are having trouble with the grid shift files you could try 
> > doing a less precise datum transformation using a 3 or 7-parameter 
> > transformation. Re-run g.setproj in the NAD27 location to set up your 
> > datum parameters.
> >
> > Paul
> >
> >
> Thanks Paul,
> 
> It ends up that the ntv1_can.dat file did not appear to be installed 
> properly. Where should the file live? I placed it in etc/nad directory 
> of the GRASS installation and then the r.proj and v.proj commands 
> worked fine.
> 
> I built my GRASS install from source on a Mac G5. Is this maybe a 
> problem with the makefiles?

Did you build GDAL with --with-static-proj4?  This option is not
compatible with GRASS.


-- 
Brad Douglas <rez at touchofmadness.com>