<div style="font-family: Arial; font-size: 14px;">Hi Even,</div><div style="font-family: Arial; font-size: 14px;"><br></div><div style="font-family: Arial; font-size: 14px;">thank you for the reply. The statement "No distinction
is made between the original and subsequent" leads me instead to understand CRS84 as strictly referring to the original datum. But the OGC registry is not normative, as far as I know. <br></div><div style="font-family: Arial; font-size: 14px;"><br></div><div style="font-family: Arial; font-size: 14px;">In the standard itself that interpretation is not given. There the WGS 84 is referenced more broadly. This is essentially the source of my doubt. <br></div><div style="font-family: Arial; font-size: 14px;"><br></div><div style="font-family: Arial; font-size: 14px;">Regards.<br></div>
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<div><br></div><div>-- <br></div><div>Luís Moreira de Sousa<br></div><div>Pastoor Bruggemanlaan 21<br></div><div>6861 GR Oosterbeek<br></div><div>The Netherlands<br></div><div>Phone: +31 628 544 755<br></div><div>Email: <a href="mailto:luis.de.sousa@protonmail.ch" rel="noopener noreferrer" target="_blank">luis.de.sousa@protonmail.ch</a><br></div><div>Mastodon: <small><span style="font-size:14px;" class="size">@</span><a href="mailto:luis_de_sousa@mastodon.social" rel="noopener noreferrer" target="_blank"><span style="font-size:14px;" class="size">luis_de_sousa@mastodon.social</span></a></small><br></div><div>URL: https://ldesousa.codeberg.page<br></div><div><br></div>
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------- Original Message -------<br>
On Thursday, August 18th, 2022 at 3:07 PM, Even Rouault <even.rouault@spatialys.com> wrote:<br><br>
<blockquote class="protonmail_quote" type="cite">
<p>Luís,</p>
<p><a href="http://www.opengis.net/def/crs/OGC/1.3/CRS84" class="moz-txt-link-freetext" rel="noreferrer nofollow noopener" target="_blank">http://www.opengis.net/def/crs/OGC/1.3/CRS84</a> is the verbose
definition of OGC CRS84.</p>
<p>It uses the EPSG:6326 datum (now modeled as a datum ensemble in
EPSG v10 database releases).</p>
<p>The following remarks in the definition makes it clear that the
intent if to be based on the datum ensemble rather than a
particular realization:<br>
</p>
<p><gml:remarks><br>
EPSG::6326 has been the then current realization. No distinction
is made between the original and subsequent (G730, G873, G1150,
G1674 and G1762) WGS 84 frames. Since 1997, WGS 84 has been
maintained within 10cm of the then current ITRF.<br>
</gml:remarks></p>
<p>For all purposes, OGC:CRS84 is identical to EPSG:4326 but the
axis order.<br>
</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 18/08/2022 à 14:59, Luí s Moreira de
Sousa via PROJ a écrit :<br>
</div>
<blockquote type="cite">
<div style="font-family: Arial; font-size: 14px;">Hi all,</div>
<div style="font-family: Arial; font-size: 14px;"><br>
</div>
<div style="font-family: Arial; font-size: 14px;">this is not a
Proj question per se, but possibly relevant to the library. The
specification is not clear, whether it refers to the datum
ensemble or to a particular datum (Transit?). Any insight on the
intention of the OGC in this regard? <br>
</div>
<div style="font-family: Arial; font-size: 14px;"><br>
</div>
<div style="font-family: Arial; font-size: 14px;">Thank you.<br>
</div>
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font-size: 14px;" class="protonmail_signature_block">
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<div>-- <br>
</div>
<div>Luís</div>
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