I followed this guide [1], but as soon as I click on calculate appears (in the mapcanvas) the message that you need to install the grid. Clicking on install, I inserted the path that points to the grilled, from me gives results ok.
[1] https://docs.qgis.org/3.28/en/docs/user_manual/working_with_projections/working_with_projections.html#integrate-an-ntv2-transformation-in-qgis saluti Il giorno mar 16 gen 2024 alle ore 12:00 andy via QGIS-User < qgis-user@lists.osgeo.org> ha scritto: > 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 > _______________________________________________ > QGIS-User mailing list > QGIS-User@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > -- *Ing. Salvatore Fiandaca* *mobile*.:+39 327.493.8955 *m*: *pigrecoinfin...@gmail.com <pigrecoinfin...@gmail.com>* *C.F*.: FNDSVT71E29Z103G *P.IVA*: 06597870820 *membro QGIS Italia - http://qgis.it/ <http://qgis.it/>* *socio GFOSS.it - *http://gfoss.it/ *member OSGeo* - *https://www.osgeo.org/member/fiandaca/* <https://www.osgeo.org/member/fiandaca/> *blog:* * https://pigrecoinfinito.com/ <https://pigrecoinfinito.com/> FB: Co-admin - https://www.facebook.com/qgis.it/ <https://www.facebook.com/qgis.it/>** <https://www.facebook.com/qgis.it/> * *TW: <http://goog_95411464>**https://twitter.com/totofiandaca <https://twitter.com/totofiandaca>* 43°51'0.54"N 10°34'27.62"E - EPSG:4326 “Se la conoscenza deve essere aperta a tutti, perchè mai limitarne l’accesso?” R. Stallman Questo documento, allegati inclusi, contiene informazioni di proprietà di FIANDACA SALVATORE e deve essere utilizzato esclusivamente dal destinatario in relazione alle finalità per le quali è stato ricevuto. E' vietata qualsiasi forma di riproduzione o divulgazione senza l'esplicito consenso di FIANDACA SALVATORE. Qualora fosse stato ricevuto per errore si prega di informare tempestivamente il mittente e distruggere la copia in proprio possesso.
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