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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear Even,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Sorry, I was using PROJ 8.2.1 as I didn’t expect the PROJ behaviour had changed since that version (see updated command results below).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">We use the ETRF2000 realisation like most other NMAs, as this is recommended by EUREF for georeferencing, not ETRF2014! Therefore, ETRS89 should not be transformed to ETRF2014 with a
null transformation. The correct transformation routes are:<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">RD -> Amersfoort -> ETRF2000 -> ITRF2000 -> ITRF2014<o:p></o:p></span></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1"><span style="mso-fareast-language:EN-US">NAP -> ETRF2000 -> ITRF2000 -> ITRF2014<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">I expected this could be achieved by changing the Amersfoort-ETRS89 transformation to Amersfoort-ETRF2000 “instead” in EPSG. I don’t understand what advantage a transformation to the
ETRS89 datum ensemble “in addition” to a transformation to the specific ETRF2000 realisation in EPSG would give.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB">In PROJ 9.1.1. RDNAP to ITRF2014:<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">echo 128410.0957 445806.4960 -0.4754 2023.00 | cs2cs epsg:7415 epsg:7912 -d 9
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Gives:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">52.000004918 5.000008844 43.0018 2023.00<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">This should be:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">52.000005512 5.000008256 43.0197 2023.00<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Like </span><span lang="EN-GB" style="mso-fareast-language:EN-US">RDNAP via ETRF2000 to ITRF2014:</span><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">echo 128410.0957 445806.4960 -0.4754 2023.00 | cs2cs epsg:7415 epsg:7931 -d 9 | cs2cs epsg:7931 epsg:7912 -d 9<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB">In PROJ 9.1.1. RDNAP to WGS84:<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">echo 128410.0957 445806.4960 -0.4754 2023.00 | cs2cs epsg:7415 epsg:4326 -d 9<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Gives:
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">51.999999889 5.000000153 -0.4754 2023.00<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">This should be:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">52.000000000 5.000000000 43.0000 2023.00<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Like RDNAP via ETRF2000 to WGS84:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas;mso-fareast-language:EN-US">echo 128410.0957 445806.4960 -0.4754 2023.00 | cs2cs epsg:7415 epsg:7931 -d 9 | cs2cs epsg:7931 epsg:4326 -d 9<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Kind regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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