<div dir="auto">Even, you are opening a can of worms… epochs.<div dir="auto">I want to see what comes out of this ;P (if any)</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Sun, 21 Jun 2026, 23:07 Even Rouault via PROJ, <<a href="mailto:proj@lists.osgeo.org">proj@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Thinking more and looking at "ETRS89-NLD [AGRS2010] to ETRF2000 (1)", I <br>
see it is a noop transformation, so with no time dependency... How does <br>
that fit with the fact that ETRF2000 is dynamic. I see that "ETRS89-NLD <br>
[AGRS2010]" uses DATUM["AGRS2010 (ETRF2000)") and has <br>
ANCHOREPOCH[2010.5]. So I'm thinking the output coordinate when <br>
applying "ETRS89-NLD [AGRS2010] to ETRF2000 (1)" is at coordinate epoch <br>
2010.5, right? Shouldn't the PROJ pipeline +proj=set +v_4=2010.5 ?<br>
<br>
Same question for ETRS89-FRA [RGF93 v2] to ETRF2000 (1) and ETRS89-FRA <br>
[RGF93 v2b] to ETRF2000 (1) with are both no-ops. Shouln't output <br>
coordinate epochs be respectively 2009 and 2019 per their anchor epoch ?<br>
<br>
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</blockquote></div>