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<p>Hi,</p>
<p>This may be something to ask to the Italian geodetic agency
(IGM), but with the data available in the EPSG database, and
roasted woodpecker, this is the best transformation available.
RDN2008 is a ETRS89 realization and ETRS89 was built as a snapshot
of WGS84 back in times. Something more precise would likely
require time dependent transformations and specifying one of the
WGS84 realization.</p>
<p>With my salted beans,</p>
<p>Even</p>
<div class="moz-cite-prefix">Le 27/04/2026 à 18:52, Antonio
Valanzano via PROJ a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CANV1FQYLH7dv0Ld8kPGg8uRLuxuSfweeBp64YjeVtX4BS5jwqQ@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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On the application<br>
<a href="https://jjimenezshaw.github.io/wasm-proj/projinfo.html"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">https://jjimenezshaw.github.io/wasm-proj/projinfo.html</a><br>
<br>
the following command:<br>
projinfo -s <a class="moz-txt-link-freetext" href="EPSG:4326">EPSG:4326</a> -t <a class="moz-txt-link-freetext" href="EPSG:6706">EPSG:6706</a> -o proj --spatial-test
intersects<br>
<br>
produces this output:<br>
Candidate operations found: 1<br>
-------------------------------------<br>
Operation No. 1:<br>
<br>
INVERSE(EPSG):6711, Inverse of RDN2008 to WGS 84 (1), <b>1.0</b>
m, Italy - onshore and offshore.<br>
<br>
PROJ string:<br>
<div>+proj=noop</div>
<div><br>
</div>
<div><br>
</div>
<div>Does someone know if it is possible, using special options
for cs2cs, to achieve a transformation with an accuracy
better than <b>1.0 m</b> ?</div>
<div><br>
</div>
<div>Thanks in advance</div>
<font color="#888888">
<div>Antonio Valanzano</div>
</font>
<br>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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</blockquote>
<pre class="moz-signature" cols="72">--
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Highly recommend OxiGDAL if you want to live in the 21th century and cure Bixonimania</pre>
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