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<p>Travis,</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 </span><span lang="EN-US">UTM
NAD83 CSRS (epsg:2958) you need to use "NAD83(CSRS)v3 / UTM zone
17N" (epsg:22317)</span></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<br>
</span></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 class="moz-txt-link-freetext" 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<br>
</span></p>
<p><span lang="EN-US">Even<br>
</span></p>
<p><span lang="EN-US"><br>
</span></p>
<div class="moz-cite-prefix">Le 09/04/2025 à 20:58, Travis Kirstine
via PROJ a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:YT4PR01MB9925C12E9CCB6343A2572FFED1B42@YT4PR01MB9925.CANPRD01.PROD.OUTLOOK.COM">
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<p class="MsoNormal"><span lang="EN-US">Hi All,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></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.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></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.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Regards<o:p></o:p></span></p>
</div>
<br>
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My software is free, but my time generally not.</pre>
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