<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Luís,</p>
<p>so you're transforming from WGS 84 (G730) to WGS 84 (G1762). I
highly doubt that any PROJ version produced anything than a null
transformation for that, given there's no known (in EPSG database)
direct transformation between those 2 realizations.</p>
<p>That said, digging a bit, in EPSG, there's :</p>
<p>- a null transformation between WGS 84 (G730) and ITRF92 .
Accuracy 0.2m</p>
<p>- a non-null time-dependent Helmert transformation between ITRF92
and ITRF2008. Accuracy 0.01 m</p>
<p>- a null transformation between ITRF2008 and WGS 84 (G1762).
Accuracy 0.01m</p>
<p>So if you do:</p>
<p>$ echo 20 10 0 2022.6 | cs2cs -d 8 "WGS 84 (G730)" ITRF92 |
cs2cs -d 8 ITRF92 ITRF2008 | cs2cs -d 8 ITRF2008 "WGS 84 (G1762)"<br>
</p>
<p>20.00000101 9.99999995 -0.00107558 2022.6</p>
<p>(in practice you can keep omit the first and last cs2cs
invokation)</p>
<p>As raised in many threads, PROJ could in theory be enhanced to
infer that itself, but it would be computationally and
programmatically complex to do so.</p>
<p>Even<br>
</p>
<div class="moz-cite-prefix">Le 04/08/2022 à 17:13, Luí s Moreira de
Sousa via PROJ a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:Y5EM-XDVQvQD1PDVnIcQb_QwVrf1Uv2hS50gwHOhs72b-aLe06rgUg2WeHILUEV4xOPOSd7nAhH8XdF70gv-81ImrYLpNSHq-QS8yNeRn_I=@protonmail.ch">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div style="font-family: Arial; font-size: 14px;"><span>Dear all,</span></div>
<div style="font-family: Arial; font-size: 14px;"><span><br>
</span></div>
<div style="font-family: Arial; font-size: 14px;"><span>This
message reports to Proj <span>8.2.1</span>. I am trying to
reproduce an exercise I conducted some years ago with Proj 6
(maybe 7) transforming coordinates between different
realisations of the WGS84 ensemble. I am using this
formulation:<br>
</span></div>
<div style="font-family: Arial; font-size: 14px;"><span><br>
</span></div>
<div style="font-family: Arial; font-size: 14px;"><span>$ cs2cs
EPSG:9053 EPSG:9057</span>
<div><span>20 10</span></div>
<div><span>20dN 10dE 0.000</span></div>
<span></span><br>
</div>
<div style="font-family: Arial; font-size: 14px;">My recollection
was cs2cs producing visible differences in the order metres.
With the current version the output is unchanged transforming
between these geodesic CRS. Do I need to use an additional
parameter? Or am I missing something else?<br>
</div>
<div class="protonmail_signature_block" style="font-family: Arial;
font-size: 14px;">
<div class="protonmail_signature_block-user">
<div><br>
</div>
<div>Thank you.<br>
</div>
<div><br>
</div>
<div>-- <br>
</div>
<div>Luís</div>
</div>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
PROJ mailing list
<a class="moz-txt-link-abbreviated" href="mailto:PROJ@lists.osgeo.org">PROJ@lists.osgeo.org</a>
<a class="moz-txt-link-freetext" href="https://lists.osgeo.org/mailman/listinfo/proj">https://lists.osgeo.org/mailman/listinfo/proj</a>
</pre>
</blockquote>
<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>
</body>
</html>