[gdal-dev] EarthWatch/DigitalGlobe .TIL format geotransform origin shifted

[Dennis Gocke]

Hi Even,

thanks for confirming and fixing the issue.

Best Regards,
Dennis

On Fri, May 15, 2015 at 10:48 AM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Dennis,
>
> https://www.digitalglobe.com/sites/default/files/ISD_External.pdf indeed
> confirms your findings (page 37 & 38, doc of originX and ulX)
>
> Fixed per http://trac.osgeo.org/gdal/ticket/5961
>
> Even
>
> > Hey guys,
> >
> >
> >
> > We have DigitalGlobe image strips which come with a *.til file.
> >
> > The geotransform of the til and the separate images have a shift of half
> a
> > pixel when opened with GDAL.
> >
> > The reason is that in the GDAL TIL driver the coordinates are treated as
> > outer pixel edge, where as it seems like they describe the pixel center,
> at
> > least in our cases.
> >
> > Does  anyone know of a description for the TIL format to verify if the
> GDAL
> > driver or the TILs from DigitalGlobe are wrong?
> >
> > For now we fixed it on our side, but you might consider changing the TIL
> > driver to treat the coordinates as pixel center.
> >
> >
> >
> > Best Regards,
> >
> > Dennis
> >
>
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>
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