[GRASSLIST:2078] Re: r.in.gdal
cakirz at itu.edu.tr
Thu Jul 5 11:42:52 EDT 2001
Thank you for your help. Your guess was correct.
Following your recommendations I have finally
managed to import an image file using r.in.gdal.
Thanks a lot
Frank Warmerdam wrote:
> ziyadin wrote:
> > Dear all,
> > -o option in "r.in.gdal" utility does not seem to work.
> > when i give the command
> > r.in.gdal input=tmp.tmp.gif output=post -o
> > grass says
> > WARNING: G_set_window(): Illegal latitude for North
> > if I give -e option to extend location extents, it says
> > cellhd.proj = 0 (unreferenced)
> > You can use the -o flag to r.in.gdal to override this check.
> > It gives the same error mesages for all the format that gdal supports.
> I am guessing that your location is in the lat/long coordinate system, and
> you are trying to import raw (ungeorefenced) files into it. I guess the
> image is taller than 90 pixel so the north edge (in pixels) is higher than
> 90, and so the system warns that the apparent georeferencing is inappropriate.
> I believe you will need to create a separate location for unreferenced data,
> and import your gif file into that. Then you can use various GRASS tools
> to properly georefence your image and take it into the desired location.
> If you know the georeferencing of your image, you might be able to associate
> a world file with the .gif file, but I don't think that GDAL supports world
> files for gif images. To pursue this angle you might need to convert the
> gif to tiff outside GRASS first.
> I appologise for the error messages. They could be better. :-)
> Best regards,
> I set the clouds in motion - turn up | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush | Geospatial Programmer for Rent
Istanbul Technical University
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Email:cakirz at itu.edu.tr
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