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<p>Jochem<br>
</p>
<span lang="EN-GB"></span><span
style="font-size:10.0pt;font-family:Consolas" lang="EN-GB"><o:p></o:p></span>
<blockquote type="cite"
cite="mid:AM0P192MB04829A295976F90C3538C720EFA49@AM0P192MB0482.EURP192.PROD.OUTLOOK.COM">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB">RDNAP to ITRF2014:<o:p></o:p></span></b></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:Consolas" lang="EN-GB">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">The result is a null
transformation, which is
<u>not</u> what we recommend:<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:Consolas" lang="EN-GB">52.00000<u>0000</u>
5.00000<u>0000</u> 43.0<u>000</u> 2023.00</span></p>
</div>
</blockquote>
<p>You didn't mention which PROJ version you use. But starting with
9.1.0, here's the result I get:</p>
<p>$ echo 128410.0957 445806.4960 -0.4754 2023.00 | PROJ_NETWORK=ON
PROJ_DEBUG=2 bin/cs2cs epsg:7415 epsg:7912 -d 9 <br>
[...]<br>
Using coordinate operation Inverse of RD New + Amersfoort to
ETRS89 (9) + Inverse of ETRS89 to NAP height (2) + Null geographic
offset from ETRS89 (geog3D) to ETRS89 (geog2D) + ETRS89 to
ETRF2014 + Conversion from ETRF2014 (geog2D) to ETRF2014
(geocentric) + Inverse of ITRF2014 to ETRF2014 (2) + Conversion
from ITRF2014 (geocentric) to ITRF2014 (geog3D)<br>
[...]<br>
52.000004918 5.000008844 43.001783708 2023.00<br>
</p>
<p>This is the first pipeline suggested by projinfo -s epsg:7415 -t
epsg:7912:</p>
<p>unknown id, Inverse of RD New + Amersfoort to ETRS89 (9) +
Inverse of ETRS89 to NAP height (2) + Null geographic offset from
ETRS89 (geog3D) to ETRS89 (geog2D) + ETRS89 to ETRF2014 +
Conversion from ETRF2014 (geog2D) to ETRF2014 (geocentric) +
Inverse of ITRF2014 to ETRF2014 (2) + Conversion from ITRF2014
(geocentric) to ITRF2014 (geog3D), 0.102 m, Netherlands - onshore,
including Waddenzee, Dutch Wadden Islands and 12-mile offshore
coastal zone., at least one grid missing<br>
<br>
PROJ string:<br>
+proj=pipeline<br>
+step +inv +proj=sterea +lat_0=52.1561605555556
+lon_0=5.38763888888889<br>
+k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel<br>
+step +proj=hgridshift +grids=nl_nsgi_rdtrans2018.tif<br>
+step +proj=vgridshift +grids=nl_nsgi_nlgeo2018.tif
+multiplier=1<br>
+step +proj=cart +ellps=GRS80<br>
+step +inv +proj=helmert +x=0 +y=0 +z=0 +rx=0.001785
+ry=0.011151 +rz=-0.01617<br>
+s=0 +dx=0 +dy=0 +dz=0 +drx=8.5e-05 +dry=0.000531
+drz=-0.00077 +ds=0<br>
+t_epoch=2010 +convention=position_vector<br>
+step +inv +proj=cart +ellps=GRS80<br>
+step +proj=unitconvert +xy_in=rad +xy_out=deg<br>
+step +proj=axisswap +order=2,1<br>
<br>
So this kind of works, but using the ETRS89 -> ETRF2014 direct
transformation, not through the ETRF2000 -> ETRF2014 one you
expect, which is quite logical since NAP height is only linked to
ETRS89.<br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:AM0P192MB04829A295976F90C3538C720EFA49@AM0P192MB0482.EURP192.PROD.OUTLOOK.COM">
<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:Consolas" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I assume that the best
way to fix this is to ask EPSG to link RDNAP to ETRF2000
instead of the ETRS89 datum ensemble. Would that indeed
solve the problem in PROJ?</span></p>
</div>
</blockquote>
I wouldn't say "instead", but "in addition". There should likely be
a ETRF2014 to NAP height transformation, and a Amersfoort to
ETRF2014 one (that could be a concatenation of Amersfoort to ETRS89
(9) + ETRS89 -> ETRF2000 + ETRF2000 -> ETRF2014 or Amersfoort
to ETRS89 (9) + ETRS89 -> ETRF2014 depending on your preference)<br>
<blockquote type="cite"
cite="mid:AM0P192MB04829A295976F90C3538C720EFA49@AM0P192MB0482.EURP192.PROD.OUTLOOK.COM">
<div class="WordSection1">
<p class="MsoNormal"><span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Kind regards, Jochem<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
</div>
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My software is free, but my time generally not.</pre>
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