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

[Even Rouault]

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
>


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