[gdal-dev] GeoTIFF: "SetDataAxisToSRSAxisMapping" effect on (consistency between) "GDALGetGeoTransform"

[Even Rouault]

Ramon,

Tricky subject,

in theory the geotransform should be interpreted by taking into account 
the DataAxisToSRSAxisMapping value (GDAL will never change the order of 
coefficients within the geotransform), but I'm afraid there's quite 
substantial code in GDAL that neglects to do it properly, and so the 
best is to stick with the OAMS_TRADITIONAL_GIS_ORDER, otherwise you're 
going to run into troubles. In https://github.com/OSGeo/gdal/pull/11622 
there was some work to make the GDALTransformer logic aware of 
DataAxisToSRSAxisMapping through a new transformer option, but it is 
only set by the new method GDALDataset::GeolocationToPixelLine() 
function, and not by the warp logic for example.

Even

Le 14/03/2025 à 16:48, Ramon Antonio via gdal-dev a écrit :
> Dear Community,
>
> Does SetDataAxisToSRSAxisMapping have any effect on GDALGetGeoTransform?
> In other words, if the axis order is changed, should the order of
> geotransform coefficients also change, automatically or manually?
>
> More details on the question are posted here:
> https://gis.stackexchange.com/questions/491133/gdal-geotiff-consistency-between-gdalgetgeotransform-and-setdataaxistosrsaxi
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