[GRASS-user] Using g.setproj to "fix" PROJ_INFO

[Paul Kelly]

You can manually edit the PROJ_INFO, WIND and DEFAULT_WIND files just to 
change the zone number. That should be all you need---but you might come 
across problems with raster maps in the location that have the zone 
number embedded in their header files; I'm not sure. Re-running g.setproj 
will do no harm either and might be a good idea if the location is very 
old.

Paul

On Mon, 15 May 2006, Patton, Eric wrote:

> Well, I would rather fix the problem of incorrect Location projection
> parameters if that is the problem - may as well fix the problem at the
> source if possible.
>
> ~ Eric.
>
>
> -----Original Message-----
> From: Maciek Sieczka
> To: Patton, Eric
> Cc: grassuser at grass.itc.it
> Sent: 5/14/2006 8:42 AM
> Subject: Re: [GRASS-user] Using g.setproj to "fix" PROJ_INFO
>
> On Fri, 12 May 2006 13:46:26 -0300
> "Patton, Eric" <epatton at nrcan.gc.ca> wrote:
>
>> Hey guys,
>>
>> A colleague is having problems with an archaic Grass project in that
>> geotiffs created from rasters in this Location only display correctly
>> in ArcGIS in UTM Zone 20 despite g.proj -p saying that the Location
>> is UTM Zone 19.
>
> What do the gdalinfo say about your geotiffs?
>
>> All the projection info I can find on data in this
>> Location says it's UTM 19, but the data displays as UTM20. We're
>> pretty sure that the ArcGIS data used as a check against the Grass
>> data is correct (let's assume so for the sake of this argument). Is
>> it ok to go ahead and make backups of PROJ_INFO and PROJ_UNITS,
>> delete the originals, and then run g.setproj to make new info files?
>> Are there any dangers to doing this? This is uncharted waters for me.
>
> You could use gdal_translate -a_srs to correct the projection in the
> output file.
>
> Maciek
>
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