<div dir="ltr"><div class="gmail_default" style="font-family:garamond,serif;font-size:large">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.<br>Clicking on install, I inserted the path that points to the grilled,<br>from me gives results ok.<br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large"><br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">[1] <a href="https://docs.qgis.org/3.28/en/docs/user_manual/working_with_projections/working_with_projections.html#integrate-an-ntv2-transformation-in-qgis">https://docs.qgis.org/3.28/en/docs/user_manual/working_with_projections/working_with_projections.html#integrate-an-ntv2-transformation-in-qgis</a></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large"><br></div><div class="gmail_default" style="font-family:garamond,serif;font-size:large">saluti</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Il giorno mar 16 gen 2024 alle ore 12:00 andy via QGIS-User <<a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi,<div>I'm doing NTv2-transformation, using this gsb file:</div><div><a href="https://web.archive.org/web/20201018143532/https://provincia.agrigento.sitr.it/scaricabili/NTv2/ItalyED50toWGS84_NTV2_GN.gsb" target="_blank">https://web.archive.org/web/20201018143532/https://provincia.agrigento.sitr.it/scaricabili/NTv2/ItalyED50toWGS84_NTV2_GN.gsb</a></div><div><br></div><div>I have copied it in "C:\OSGeo4W\share\proj" and I have defined this custom projection:</div><div>+proj=utm +zone=33 +ellps=intl +nadgrids=ItalyED50toWGS84_NTV2_GN.gsb +units=m +no_defs +type=crs<br></div><div><br></div><div>If I test it in QGIS, in the custom CRS window, using lon=13 and lat=38, I have in output:</div><div>324388.7743<br></div><div>4207772.1972<br></div><div><br></div><div>If I do the same in gdal, running</div><div><br></div><div>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"<br></div><div><br></div><div>I get </div><div>324454.613619553</div><div>4207894.92605038</div><div><br></div><div>Why do I have these differences? Am I doing something wrong?<br></div><div><br></div><div>I'm using QGIS 3.28.2-Firenze and GDAL 3.6.2, released 2023/01/02, in Windows 11.</div><div><br></div><div>Thank you,</div><div><br></div><div>Andrea<br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><span style="font-size:small">___________________</span><br></div><div dir="ltr"><span style="font-size:small"><br></span></div><div dir="ltr">Andrea Borruso<br>
website: <a href="https://medium.com/tantotanto" target="_blank">https://medium.com/tantotanto</a><br>38° 7' 48" N, 13° 21' 9" E, EPSG:4326<br><span style="font-size:small">___________________</span><br>
<br>
"cercare e saper riconoscere chi e cosa,<br>
in mezzo all’inferno, non è inferno, <br>
e farlo durare, e dargli spazio"<br>
<br>
Italo Calvino<br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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</blockquote></div><br clear="all"><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font size="2"><font face="garamond, serif"><b>Ing. Salvatore Fiandaca</b><br><b>mobile</b>.:+39 327.493.8955 <br><b>m</b>: <b><a href="mailto:pigrecoinfinito@gmail.com" target="_blank">pig<span></span><span></span>recoinfinito@gmail.com</a></b></font></font></div><div><font face="garamond, serif" size="2"><b>C.F</b>.: FNDSVT71E29Z103G</font></div><div><font face="garamond, serif" size="2"><b>P.IVA</b>: 06597870820</font></div><div><font face="garamond, serif" size="2"><b>membro QGIS Italia - <a href="http://qgis.it/" target="_blank">http://qgis.it/</a></b><br><b>socio GFOSS.it - </b><a href="http://gfoss.it/" style="font-weight:bold" target="_blank">http://gfoss.it/</a></font></div><div><b>member OSGeo</b> - <a href="https://www.osgeo.org/member/fiandaca/" target="_blank"><b>https://www.osgeo.org/member/fiandaca/</b></a></div><div><font face="garamond, serif" size="2"><b>blog:</b><b><a href="https://pigrecoinfinito.com/" target="_blank"> https://pigrecoinfinito.com/</a> <br>FB: Co-admin - <a href="https://www.facebook.com/qgis.it/" target="_blank">https://www.facebook.com/qgis.it/</a></b></font><b style="font-family:garamond,serif;font-size:small"><a href="https://www.facebook.com/qgis.it/" target="_blank"> </a> </b></div><div><b style="font-family:garamond,serif;font-size:small">TW:<a href="http://goog_95411464" target="_blank"> </a></b><font face="garamond, serif" size="2"><b><a href="https://twitter.com/totofiandaca" target="_blank">https://twitter.com/totofiandaca</a></b></font></div><div><font face="garamond, serif" size="2"><br></font></div><div dir="ltr"><font face="garamond, serif"><font size="2">43°51'0.54"N 10°34'27.62"E - EPSG:4326</font></font></div><div dir="ltr"><font face="garamond, serif"><font size="2"><br></font></font></div><div dir="ltr"><font face="garamond, serif"><font size="2">“Se la conoscenza deve essere aperta a tutti,</font></font></div><div dir="ltr"><font face="garamond, serif"><font size="2">perchè mai limitarne l’accesso?” </font></font></div><div dir="ltr"><font face="garamond, serif"><font size="2">R. Stallman<br><br></font></font><span style="font-family:"Trebuchet MS";font-size:10px">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 </span><span style="font-family:"Trebuchet MS";font-size:10px">FIANDACA SALVATORE</span><span style="font-family:"Trebuchet MS";font-size:10px">.</span><span style="font-family:"Trebuchet MS";font-size:10px"> Qualora fosse stato ricevuto per errore si prega di informare tempestivamente il mittente e distruggere la copia in proprio possesso.<br></span><font face="garamond, serif"><font size="2"><br><br></font></font></div><div dir="ltr"><font face="garamond, serif"><font size="2"></font></font></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>