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<blockquote type="cite"
cite="mid:AM0P192MB0482D8688DD8394826098EECEFAA9@AM0P192MB0482.EURP192.PROD.OUTLOOK.COM">
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<p class="MsoNormal" style="margin-left:35.4pt"><span
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span
lang="EN-GB">ER wrote:<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:35.4pt"><span
lang="EN-GB">></span><span lang="EN-GB"> The null
transformation between ETRS89 and ETRF2014 comes with the
definition of the datum ensemble ETRS89 (cf change
</span><a href="https://github.com/OSGeo/PROJ/issues/3263"
moz-do-not-send="true"><span lang="EN-GB">https://github.com/OSGeo/PROJ/issues/3263</span></a><span
lang="EN-GB">)</span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">The problem is not the
null transformation between the ensemble and its members,
but that the transformation route through ETRF2014 is
recommended. In my opinion, the route trough ETRF2000 should
be the default. Not only for the Netherlands but, for Europe
in general. </span></p>
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</blockquote>
PROJ has no idea of what is recommended/preferred by European
geodestists ;-) It only trusts records in its database.<br>
<blockquote type="cite"
cite="mid:AM0P192MB0482D8688DD8394826098EECEFAA9@AM0P192MB0482.EURP192.PROD.OUTLOOK.COM">
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<p class="MsoNormal"><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thus ETRS89 ->
ETRF2000 -> ITRF2000 -> ITRF2014
</span><span lang="EN-GB">instead of </span><span
lang="EN-GB">ETRS89 -> ETRF2014 -> ITRF2014. What
makes PROJ choose the latter?</span></p>
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</blockquote>
<p>PROJ can only infer pipelines with at most one intermediate CRS.
If you want <span lang="EN-GB">ETRS89 -> ETRF2000 ->
ITRF2000 -> ITRF2014, you need an explicit concatenated
operation chaining the 3 individual steps.</span></p>
<p><span lang="EN-GB">Even</span></p>
<br>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.spatialys.com">http://www.spatialys.com</a>
My software is free, but my time generally not.</pre>
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