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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Hello all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">I've come across a weird edge case and I'm wondering if anyone has seen something similar.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">I'm updating our application from GDAL v2.2 to v3.2 and have a failing test where there is a 1 pixel shift in the output. We're building a VRT from a DTM and a flood depth raster
and when you call ds.ReadAsArray() on the VRT there is a duplicated column of pixels at GDAL 2, which is causing the apparent shift. It's not worth raising a ticket, as the GDAL 3 output is correct, but I can't explain why this shift has happened and I'm wondering
if this has happened anywhere else. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">If I open the two VRTs in QGIS, they look the same, so maybe it's an issue with ReadAsArray. There is slight difference in SRS precision, which might be causing a rounding error,
but otherwise I've no idea what might be causing it.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">GDAL 2<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><SRS><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PROJCS["North_America_Albers_Equal_Area_Conic",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">GEOGCS["NAD83",DATUM["North_American_Datum_1983",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">SPHEROID["GRS 1980",6378137,298.2572221010042,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["EPSG","4269"]],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PROJECTION["Albers_Conic_Equal_Area"],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["standard_parallel_1",20],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["standard_parallel_2",60],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["latitude_of_center",40],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["longitude_of_center",-96],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["false_easting",0],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]]]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"></SRS><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">GDAL 3<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><SRS dataAxisToSRSAxisMapping="1,2"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PROJCS["North_America_Albers_Equal_Area_Conic",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">GEOGCS["NAD83",DATUM["North_American_Datum_1983",<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">SPHEROID["GRS 1980",6378137,298.257222101004,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PROJECTION["Albers_Conic_Equal_Area"],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["latitude_of_center",40],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["longitude_of_center",-96],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["standard_parallel_1",20],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["standard_parallel_2",60],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["false_easting",0],<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH]]<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"></SRS><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black">Jon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-GB">Jon Morris<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#F6A124;mso-fareast-language:EN-GB">Software Developer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:12.0pt;color:black;mso-fareast-language:EN-GB">COVID-19. During the current outbreak JBA remains open for business and we continue to deliver our services. However, we have adopted flexible/remote working as required.
I will be receiving and reading email as normal but I may not always be available on the office number.</span></i><span style="color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p><a href="https://www.jbagroup.co.uk/sites/www.jbagroup.co.uk/files/documents/15-030%20JBA%20Business%20Continuity%20Briefing%20-%20Latest.pdf"><img width="449" src="https://www.jbagroup.co.uk/imgstore/covid19footer.png" alt="JBA COVID-19 statement"></a></p>
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If you are not the named addressee you should not disseminate, distribute or copy this e-mail.</span><br>
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<p style="margin: 0cm 0cm 0pt;"><span style="color: rgb(68, 68, 68); font-family: "Arial",sans-serif; font-size: 8pt;"><span style="background: white;">JBA Risk Management Limited is registered in England, company number 07732946, 1 Broughton Park, Old Lane
North, Broughton, Skipton, North Yorkshire, BD23 3FD, </span></span><span style="background: white; color: black; font-family: "Arial",sans-serif; font-size: 8pt;">Telephone: +441756799919</span></p>
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