JL wrote:
> the route trough ETRF2000 should be the default […] > Thus ETRS89 -> ETRF2000 -> ITRF2000 -> ITRF2014 instead of ETRS89 -> ETRF2014 > -> ITRF2014. What makes PROJ choose the latter? ER wrote: > PROJ has no idea of what is recommended/preferred by European geodestists ;-) > It only trusts records in its database. > 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. 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: projinfo -s epsg:7931 -t epsg:7912 Operation No. 1: unknown id, Conversion from ETRF2000 (geog3D) to ETRF2000 (geocentric) + Inverse of ITRF2014 to ETRF2000 (1) + Conversion from ITRF2014 (geocentric) to ITRF2014 (geog3D), 0 m projinfo -s epsg:8403 -t epsg:7912 Operation No. 1: unknown id, Conversion from ETRF2014 (geog3D) to ETRF2014 (geocentric) + Inverse of ITRF2014 to ETRF2014 (2) + Conversion from ITRF2014 (geocentric) to ITRF2014 (geog3D), 0 m 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? Jochem Disclaimer: De inhoud van deze e-mail is vertrouwelijk en uitsluitend bestemd voor de geadresseerde(n). Gebruik, openbaarmaking, vermenigvuldiging, verspreiding en/of verstrekking van deze informatie aan derden is niet toegestaan. Op al onze producten en diensten zijn onze algemene leveringsvoorwaarden van toepassing [https://www.kadaster.nl/algemene-leveringsvoorwaarden]. Disclaimer: This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited. Our general terms and conditions of delivery apply to all our products and services [https://www.kadaster.com/general-terms-and-conditions].
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