Thanks very much, I would never have figured that out myself.
Just to make it clear I should add this flag on all OGRSpatialReference or only when it is loaded with importFromWkt ? --Philippe ________________________________ From: gdal-dev <[email protected]> on behalf of Laurențiu Nicola via gdal-dev <[email protected]> Sent: Tuesday, October 18, 2022 1:01 PM To: [email protected] Subject: Re: [gdal-dev] Problem with coordinate transformation Hi Philippe, The new behaviour is correct. See https://gdal.org/development/rfc/rfc73_proj6_wkt2_srsbarn.html#axis-order-issues for the axis order issue, a change made in GDAL 3.0. You can find a solution in https://github.com/OSGeo/gdal/blob/v3.5.0/MIGRATION_GUIDE.TXT#L67 (calling SetAxisMappingStrategy(OAMS_TRADITIONAL_GIS_ORDER) on every OGRSpatialReference you use. Laurentiu On Tue, Oct 18, 2022, at 13:43, Philippe Lelong wrote: Hi, I have an app build against GDAL 3.4.1 and PROJ6, and the same app build against GDAL 2.1.3 and PROJ4. They are not giving the same result when using OGRCoordinateTransformation. If I do const char *their = "GEOGCS[\"WGS 84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS 84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPSG\",\"6326\"]],PRIMEM[\"Greenwich\",0],UNIT[\"degree\",0.0174532925199433],AUTHORITY[\"EPSG\",\"4326\"]]"; const char *our = "+proj=longlat +datum=WGS84 +ellps=WGS84 +no_defs +over"; double miX = -17.4042; double miY = 35.3333; OGRSpatialReference theirReference; theirReference.importFromWkt((char**)&their); OGRSpatialReference ourReference; ourReference.importFromProj4(our); OGRCoordinateTransformation *trans = OGRCreateCoordinateTransformation(&theirReference, &ourReference); trans->Transform(1, &miX, &miY); in the version build against GDAL 3.4.1/PROJ6 this code results in swapping miX and miY (i.e. miX = 35.3333 and miY = -17.4042) The version build against GDAL 2.1.3/PROJ4 leaves miX and miY unchanged, which I believe is correct. Any explanation for this behavior and which one is correct? Would I get the same result using PROJ8 ? Thanks in advance Philippe Lelong _______________________________________________ gdal-dev mailing list [email protected]<mailto:[email protected]> https://lists.osgeo.org/mailman/listinfo/gdal-dev
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