<div dir="ltr">Jochem,<div><br></div><div>You're most welcome to submit a PR with a solution that fits your needs. Otherwise, I believe the solution to the problem you mention is to have a geometric national system, which you link to the global with a Helmert operation, then a separate step for the geometric-to-geophysical. Alternatively, use a pipeline, which will hide the axisswap steps from the end user.</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Den tirs. 7. maj 2024 kl. 14.23 skrev Lesparre, Jochem via PROJ <<a href="mailto:proj@lists.osgeo.org">proj@lists.osgeo.org</a>>:<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 class="msg-8711809956419998412">
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">Hi Even,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">For the 3 islands of the Dutch Caribbean we have 2 islands with a time-dependent transformation (with no geoid yet) and 1 island with
a (not yet time-dependent) transformation with a geoid. Using the 4th component and axisswap for the height would be too confusing. Moreover, we are going to introduce a time-dependent transformation for the third island as soon as possible.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">The combination of a
</span><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">7-parameter transformation and a geoid is the most basic transformation from an international 3D geographic CRS to a national projected CRS and a
national physical height system. Don’t you find it troublesome that PROJ needs a workaround for that? I really hope you will be able to
</span><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">choose an approach soon, even if it isn’t entirely your taste.<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif">Jochem<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:11pt;font-family:Calibri,sans-serif"><u></u> <u></u></span></p>
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