[gdal-dev] Georeference without rotation of output image

[Ivan Castellucci Vidal]

Thanks Even!

That's exactly what I was looking for and I just have one question about it.
GDAL documentation states: "Due to imprecision in the calculations the fit
algorithm will often return non-zero rotational coefficients even if given
perfectly non-rotated inputs"

Is there a way to use a more precise algorithm? It's not a requirement by
now since this program is in development but at some point I'll need to
count with the maximum possible precision to make it work in a production
release.


On Fri, Aug 14, 2015 at 1:22 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

>
> > Instead of warping the image, you could compute a geotransformation
> matrix
> > that would include rotational terms with GDALGCPsToGeoTransform()
> >
> > http://www.gdal.org/gdal_8h.html#ae44b32f08d61072dddbdd30ac8ca962b
> >
> > and set it to your geotiff with GDALSetGCPs()
> >
> > http://www.gdal.org/gdal_8h.html#acd47aa85ca5751fbe9ea09c1a2341ef8
> >
>
> Arg, sorry I meant with GDALSetGeoTransform() of course :
> http://www.gdal.org/gdal_8h.html#ae93448112c1a7e69f2764c1aa3c6c8b5()
>
> GDALSetGCPs() is to set the "raw" GCPs.
>
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-- 
Iván Castellucci Vidal
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