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

[Nick Ves]

On Fri, May 15, 2015 at 11:48 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)
>

on http://www.gdal.org/formats_list.html there isn't an entry to til
format or I'm mistaken?

> 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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