Hello all, I've come across a weird edge case and I'm wondering if anyone has seen something similar.
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. 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. GDAL 2 <SRS> PROJCS["North_America_Albers_Equal_Area_Conic", GEOGCS["NAD83",DATUM["North_American_Datum_1983", SPHEROID["GRS 1980",6378137,298.2572221010042,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]], PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["EPSG","4269"]], PROJECTION["Albers_Conic_Equal_Area"], PARAMETER["standard_parallel_1",20], PARAMETER["standard_parallel_2",60], PARAMETER["latitude_of_center",40], PARAMETER["longitude_of_center",-96], PARAMETER["false_easting",0], PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]]] </SRS> GDAL 3 <SRS dataAxisToSRSAxisMapping="1,2"> PROJCS["North_America_Albers_Equal_Area_Conic", GEOGCS["NAD83",DATUM["North_American_Datum_1983", SPHEROID["GRS 1980",6378137,298.257222101004,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","6269"]], PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4269"]], PROJECTION["Albers_Conic_Equal_Area"], PARAMETER["latitude_of_center",40], PARAMETER["longitude_of_center",-96], PARAMETER["standard_parallel_1",20], PARAMETER["standard_parallel_2",60], PARAMETER["false_easting",0], PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH]] </SRS> Thanks, Jon Jon Morris Software Developer 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. [JBA COVID-19 statement]<https://www.jbagroup.co.uk/sites/www.jbagroup.co.uk/files/documents/15-030%20JBA%20Business%20Continuity%20Briefing%20-%20Latest.pdf> T +44 (0) 1756 799919 www.jbarisk.com<http://www.jbarisk.com> [Visit our website]<http://www.jbarisk.com> [http://www.jbagroup.co.uk/imgstore/JBA-Email-Sig-Icons-LINKEDIN.png] <https://www.linkedin.com/in/jon-morris-a2897b4/> [Follow us on Twitter] <https://twitter.com/jbarisk> Find out more about us here: www.jbarisk.com<http://www.jbarisk.com/> and follow us on Twitter @JBARisk<http://twitter.com/JBARisk> and LinkedIn<https://www.linkedin.com/company/2370847?trk=tyah&trkInfo=clickedVertical%3Acompany%2CclickedEntityId%3A2370847%2Cidx%3A2-1-2%2CtarId%3A1447414259786%2Ctas%3AJBA%20RISK%20MANAGEMENT> The JBA Group supports the JBA Trust. All JBA Risk Management's email messages contain confidential information and are intended only for the individual(s) named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system. JBA Risk Management Limited is registered in England, company number 07732946, 1 Broughton Park, Old Lane North, Broughton, Skipton, North Yorkshire, BD23 3FD, Telephone: +441756799919
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