Hi, I'm doing NTv2-transformation, using this gsb file: https://web.archive.org/web/20201018143532/https://provincia.agrigento.sitr.it/scaricabili/NTv2/ItalyED50toWGS84_NTV2_GN.gsb
I have copied it in "C:\OSGeo4W\share\proj" and I have defined this custom projection: +proj=utm +zone=33 +ellps=intl +nadgrids=ItalyED50toWGS84_NTV2_GN.gsb +units=m +no_defs +type=crs If I test it in QGIS, in the custom CRS window, using lon=13 and lat=38, I have in output: 324388.7743 4207772.1972 If I do the same in gdal, running gdaltransform --debug ON -s_srs EPSG:4326 -t_srs "+proj=utm +zone=33 +ellps=intl +nadgrids=C:\OSGeo4W\share\proj\ItalyED50toWGS84_NTV2_GN.gsb +units=m +no_defs +type=crs" I get 324454.613619553 4207894.92605038 Why do I have these differences? Am I doing something wrong? I'm using QGIS 3.28.2-Firenze and GDAL 3.6.2, released 2023/01/02, in Windows 11. Thank you, Andrea -- ___________________ Andrea Borruso website: https://medium.com/tantotanto 38° 7' 48" N, 13° 21' 9" E, EPSG:4326 ___________________ "cercare e saper riconoscere chi e cosa, in mezzo all’inferno, non è inferno, e farlo durare, e dargli spazio" Italo Calvino
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