[GRASSLIST:456] Re: g.setproj problem

[Moritz Lennert]

Ian Macmillan said:
> Hi all, I am trying to import a non georeferenced tif into a lat long
> location.
> I received the standard error in this situation stating
>
> WARNING: G_set_window(): Illegal latitude for South
>
> As suggested in GRASSLIST 6203, I want to change my lat long location into
> an xy
> location using g.setproj, import the tif and set the boundaries, then
> reset
> back to lat long.  Here is the problem.  When I run g.setproj, I never get
> a
> chance to set the projection.  A typical interactive session looks like
> this:
>
> GRASS 5.0.0 > g.setproj
>
>
> WARNING!  A projection file
> '/Users/gans/grass/sonoralatlong/PERMANENT/PROJ_INFO'
>    already exists for this location
>
> This file contains all the parameters for the location's projection:
> Latitude-Longitude
>
> Overriding this information implies that the old projection parameters
>     were incorrect.  If you change the parameters, all existing data will
> be
>     interpreted differently by the projection software.
>     GRASS will not re-project your data automatically
>
> Would you still like to change some of the parameters (y/n) [n] y
> The current ellipsoid is clark66
> Would you want to change ellipsoid parameter (y/n) [n]
> The ellipse information is not changed
> Do you want to specify a map datum for this location?(y/n) [n]
>
> Projection information has been recorded for this location
>
>
> What is going on?  Is there a way to import a tif into a lat long besides
> this
> method?  I am running GRASS 5.0.0 v2 (OpenOSX) on mac 10.2.6.
>

The method that is generally recommended is to create a separate x,y
location, import the raster file into that location and then
geocode/reproject into the lat-long location. See
http://grass.itc.it/gdp/grass5tutor/HTML/c1014.html for more information.

Moritz