[gdal-dev] gdalbuildvrt 2.1.0 and off by 1 pixel display

[Jed Frechette]

Great. Thanks!


  Original Message  
From:even.rouault at spatialys.com
Sent:July 1, 2016 15:50
To:jedfrechette at gmail.com
Cc:gdal-dev at lists.osgeo.org
Subject:Re: [gdal-dev] gdalbuildvrt 2.1.0 and off by 1 pixel display

Le vendredi 01 juillet 2016 22:48:36, Jed Frechette a écrit :
> On 2016-07-01 1:51 PM, Even Rouault wrote:
> > If read by GDAL < 2.1, those VRT files will
> > exhibit possible one-off shift, since those older versions only read
> > values as integers. Is it your case ?
> 
> I see it in QGIS 2.14.3 (built against GDAL 2.0.2 and 2.1.0), QGIS
> 2.15.0 91c2d76 (GDAL 2.1.0), and ArcMap 10.1.
> 
> It seems like this has the potential to cause a lot of subtle issues in
> third party applications that, for various reasons, may be using
> different versions of the GDAL library. It also worries me that I'm
> seeing the offset in versions of QGIS (including the current weekly
> snapshot) that are reportedly built with GDAL 2.1.
> 
> > Could you share a way to reproduce the issue ?

I've pushed a fix in https://trac.osgeo.org/gdal/ticket/6568 

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