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<p class="MsoNormal">Thanks Even!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-CA">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-ligatures:none;mso-fareast-language:EN-CA">
Even Rouault <even.rouault@spatialys.com> <br>
<b>Sent:</b> Wednesday, April 9, 2025 3:23 PM<br>
<b>To:</b> Travis Kirstine <tkirstine@firstbasesolutions.com>; proj@lists.osgeo.org<br>
<b>Subject:</b> Re: [PROJ] setting default transformation NAD83 CSRS to / from NAD83 Original<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<span style="font-size:9.0pt;font-family:wf_segoe-ui_normal;color:#212121">You don't often get email from
<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>. <a href="https://aka.ms/LearnAboutSenderIdentification">
Learn why this is important</a> <o:p></o:p></span></p>
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<p>Travis,<o:p></o:p></p>
<p>in EPSG, the grid <span lang="EN-US">ON83CSv1 is registered for the transformation between NAD83 original and NAD83(CSRS) v3. Note the v3 suffix. So instead of UTM NAD83 CSRS (epsg:2958) you need to use "NAD83(CSRS)v3 / UTM zone 17N" (epsg:22317)</span><o:p></o:p></p>
<p><span lang="EN-US">$ projinfo -s EPSG:22317 -t EPSG:26917 --spatial-test intersects -o PROJ --single-line -q<br>
+proj=pipeline +step +inv +proj=utm +zone=17 +ellps=GRS80 +step +inv +proj=hgridshift +grids=ca_nrc_ON83CSv1.tif +step +proj=utm +zone=17 +ellps=GRS80</span><o:p></o:p></p>
<p><span lang="EN-US">$ echo 500000 5000000 | PROJ_NETWORK=ON PROJ_DEBUG=2 bin/cs2cs EPSG:22317 EPSG:26917<br>
[...]<br>
Using <a href="https://cdn.proj.org/ca_nrc_ON83CSv1.tif">https://cdn.proj.org/ca_nrc_ON83CSv1.tif</a><br>
500000.08 5000000.32 0.00</span><o:p></o:p></p>
<p><span lang="EN-US">Even</span><o:p></o:p></p>
<p><o:p> </o:p></p>
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<p class="MsoNormal">Le 09/04/2025 à 20:58, Travis Kirstine via PROJ a écrit :<o:p></o:p></p>
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<p class="MsoNormal"><span lang="EN-US">Hi All,</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">I’ve been struggling with trying to set proj to use ca_nrc_ON27CSv1.tif grid as the default transformation when transforming between UTM NAD83 CSRS (epsg:2958) and UTM NAD83 (epsgL26917) Original.
</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">In the past I’ve specified the +nadgrids=./ON83CSv1.gsb in the cs2cs command but was hoping that I could just set the default value in the proj.db to apply the gridshift.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Is this possible? I’ve run the projsync to pull the new version of the grid but still no luck.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">Regards</span><o:p></o:p></p>
<p class="MsoNormal"><span style="mso-ligatures:none;mso-fareast-language:EN-CA"><br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>PROJ mailing list<o:p></o:p></pre>
<pre><a href="mailto:PROJ@lists.osgeo.org">PROJ@lists.osgeo.org</a><o:p></o:p></pre>
<pre><a href="https://lists.osgeo.org/mailman/listinfo/proj">https://lists.osgeo.org/mailman/listinfo/proj</a><o:p></o:p></pre>
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<pre>-- <o:p></o:p></pre>
<pre><a href="http://www.spatialys.com">http://www.spatialys.com</a><o:p></o:p></pre>
<pre>My software is free, but my time generally not.<o:p></o:p></pre>
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