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<p class="MsoPlainText" style="margin-left:70.8pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-left:70.8pt"><span lang="EN-GB">JL wrote:<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:70.8pt"><span lang="EN-GB">> the route trough ETRF2000 should be the default […]<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:70.8pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-left:70.8pt"><span lang="EN-GB">> Thus ETRS89 -> ETRF2000 -> ITRF2000 -> ITRF2014 instead of ETRS89 -> ETRF2014 -> ITRF2014. What makes PROJ choose the latter?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB">ER wrote:<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB">> PROJ has no idea of what is recommended/preferred by European geodestists ;-) It only trusts records in its database.<o:p></o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-left:35.4pt"><span lang="EN-GB">> PROJ can only infer pipelines with at most one intermediate CRS. If you want ETRS89 -> ETRF2000 -> ITRF2000 -> ITRF2014, you need an explicit concatenated operation chaining the 3 individual
steps.<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">In fact, in PROJ the ETRS89 -> ETRF2000 -> ITRF2000 -> ITRF2014 route gives identical results to ETRS89 -> ETRF2000 -> ITRF2014, and this also has only one intermediate CRS:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">projinfo -s epsg:7931 -t epsg:7912<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">Operation No. 1:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">unknown id, Conversion from ETRF2000 (geog3D) to ETRF2000 (geocentric) + Inverse of ITRF2014 to ETRF2000 (1) + Conversion from ITRF2014 (geocentric) to ITRF2014 (geog3D),
0 m<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">projinfo -s epsg:8403 -t epsg:7912<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">Operation No. 1:<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB" style="font-size:10.0pt;font-family:Consolas">unknown id, Conversion from ETRF2014 (geog3D) to ETRF2014 (geocentric) + Inverse of ITRF2014 to ETRF2014 (2) + Conversion from ITRF2014 (geocentric) to ITRF2014 (geog3D),
0 m<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB">If it is not the number of steps, what makes PROJ not choose ETRS89 -> ETRF2000 -> ITRF2014 but ETRS89 -> ETRF2014 -> ITRF2014 instead? And what would need to be changed in the database to change that transformation
route?<o:p></o:p></span></p>
<p class="MsoPlainText"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoPlainText">Jochem<o:p></o:p></p>
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