[GRASS-user] ERROR: lat/long databases not (yet) supported

[Roger Bivand]

On Mon, 22 Jan 2007 mlage at usal.es wrote:

> 
> Hello,
> 
> I’m desperate! Help me please.
> I don’t understand why when I write the coordinates in the command line:
> 
> r.los in=map out=visibility coord=-6.411,42.162
> 
> I get this error message:
> 
> ERROR: lat/long databases not (yet) supported.
> 
> What am I doing wrong???? Please help me!!!!
> 

Not reading the error message? Lines 132/4 in raster/r.los/main.c say:

    if ((G_projection() == PROJECTION_LL))
	G_fatal_error(
	  _("Lat/Long support is not (yet) implemented for this module."));

which means that no automatic projection is available. Use r.proj to 
create a new projected location. Measuring distances from point 
and raster cell positions in long/lat involves Great Circle distances, and 
these are not available for this module; planar geometry is much simpler.


> 
> Thank you!
> 
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no