Le 29/04/2023 à 19:58, Javier Jimenez Shaw a écrit :
Thanks Even.
Yes, I will contact BKG.
I was thinking on another option: defining a Helmert transformation
between ETRS89/DREF91/2016 and ETRS89, (probably with 0,0,0 params)
and some (in)accuracy, to "connect" the new system with the old ones.
Otherwise the "new" systems and the "old" ones are disconnected and
only ballpark transformations are possible. Something like
https://epsg.org/transformation_9703/ETRF2000-PL-to-ETRS89-1.html for
Poland. (https://epsg.org/search/by-name/?query=ETRF2000-PL sounds
very similar to
https://epsg.org/search/by-name?searchedTerms=ETRS89%2FDREF91%2F2016
but without that "link" to the "old" systems).
What do you think about this? Would it work?
Yes that also crossed through my mind. I believe it should work (but
beware of the limitations of PROJ inference logic of guessing at most a
single intermediate CRS, but for doing WGS84 -> ETRS89 ->
ETRS89/DREF91/2016, that should work). You might simulate that
beforehand by creating such a Helmert transformation.
--
http://www.spatialys.com
My software is free, but my time generally not.
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