[GRASSLIST:9875] Re: GeoTiffs shifted by 360 degrees after processing in GRASS

Markus Neteler neteler at itc.it
Tue Jan 17 08:43:03 EST 2006


Dorit,

you can download it from CVS:
http://freegis.org/cgi-bin/viewcvs.cgi/grass6/scripts/i.in.spotvgt/
-> i.in.spotvgt
-> or download tarball there

BTW: Depending on your operating system, there are precompiled binaries
of GRASS 6.1 available.

Markus

Gross, Dorit (SDRN) wrote:

> Markus, thanks for your reply.
>
> I currently use Grass 6.0.0 and it seems 6.1 is still under
> development. Is it possible to get the i.in.spotvgt script only and to
> implement it in the old version or do we have to compile the whole
> source code of 6.1.
>
> Dorit
>
>
>
>
> On Mon, Jan 16, 2006 at 04:44:57PM +0100, Gross, Dorit (SDRN) wrote:
> >/ Dear all,
> />/
> />/ I have a set of GeoTiffs that I import into GRASS to do some
> processing and
> />/ export them afterwards as GeoTiffs again. The problem now is that
> GRASS
> />/ exports the images shifted by 360 degrees to the east.
> />/
> />/
> />/ Corner Coordinates (before the import into GRASS):
> />/ Upper Left  (-180.0044643,  75.0044643) (180d 0'16.07"W, 75d
> 0'16.07"N)
> />/ Lower Left  (-180.0044643, -56.0044643) (180d 0'16.07"W, 56d
> 0'16.07"S)
> />/ Upper Right ( 179.9955353,  75.0044643) (179d59'43.93"E, 75d
> 0'16.07"N)
> />/ Lower Right ( 179.9955353, -56.0044643) (179d59'43.93"E, 56d
> 0'16.07"S)
> />/ Center      (  -0.0044645,   9.5000000) (  0d 0'16.07"W,  9d30'0.00"N)
> />/
> />/ Corner Coordinates (after the export from GRASS):
> />/ Upper Left  ( 179.9955357,  75.0044643) (179d59'43.93"E, 75d
> 0'16.07"N)
> />/ Lower Left  ( 179.9955357, -56.0044643) (179d59'43.93"E, 56d
> 0'16.07"S)
> />/ Upper Right (     539.996,      75.004) (539d59'43.93"E, 75d
> 0'16.07"N)
> />/ Lower Right (     539.996,     -56.004) (539d59'43.93"E, 56d
> 0'16.07"S)
> />/ Center      (     359.996,       9.500) (359d59'43.93"E,  9d30'0.00"N)
> />/
> />/
> />/ Has someone of you faced a similar problem? How do I receive a proper
> />/ georeference when exporting from GRASS?
> />/
> />/ The input GeoTiffs are a set of converted Spot-Veg HDF files using
> GDAL.
> /
> Did you try to use the dedicated script i.in.spotvgt:
>
>  _http://grass.itc.it/grass61/manuals/html61_user/i.in.spotvgt.html_
>
> Maybe this solves the problem of the global wrap-around.
> Please let us know.
>
> Markus
>
> >/ The -180.0044... degrees for the upper left X seems a bit odd, but
> GDAL imports
> />/ the Spot-Veg properly with these coordinates. I checked the images
> in Erdas
> />/ and they are correct. I also checked the corner coordinates of the
> imported
> />/ file insight GRASS and also here the coordinates are correct. So
> apparently
> />/ the shift occurs during the export from GRASS into GeoTiff. At the
> moment I
> />/ solve the problem by reassigning the georeference to the GeoTiff
> after the
> />/ export from GRASS, but I would be more happy with properly
> exported images
> />/ right away.
> />/
> />/ Can someone help please?
> />/
> />/ Thank you,
> />/ Dorit
> />/
> /
> --
> Markus Neteler     <neteler itc it>       _http://mpa.itc.it_
> ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
> MPBA - Predictive Models for Biol. & Environ. Data Analysis
> Via Sommarive, 18        -       38050 Povo (Trento), Italy
>




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