OSGeo
NZGD2000 to ITRF2020 ?
CC @ccrook
Latest EPSG dataset integrated in PROJ has ITRF2020. I see that in our other_transformation_custom.sql we have concatenated operations for NZGD2000 to ITRF97/2000//2005/2008/2014. There's none explicit to ITRF2020, but if doing NZGD2000 to ITRF2020, PROJ will automatically propose NZGD2000 -> ITRF96 and the "generic" "ITRF96 -> ITRF2020 (1)" (EPSG:9996), which propably leads to suboptimal results, as for ITRF96 -> ITRF97/2000//2005/2008/2014, there are custom transformation from New Zealand, that are the ones used in the above mentioned explicit concatenated operations. So I presume that LINZ will at some point submit a ITRF96 -> ITRF2020 for New Zealand to EPSG, that will have to be explicitly used in a concatenated NZGD2000 to ITRF2020, right ?
which propably leads to suboptimal results
Do not they all build on each other, like WGS frame realisations with epoch (last being G2139 that is derived from G1762')? Or are you saing dynamic epoch stuff will break everything?
Do not they all build on each other, like WGS frame realisations with epoch (last being G2139 that is derived from G1762')? Or are you saing dynamic epoch stuff will break everything?
not sure to understand your question and being geodetically savy enough to answer it if I would, but my understanding is that the defaultt ITRF96->ITRF2020 transformation from EPSG has a validity for the whole world, whereas New Zealand is able to derive a more precise transformation that is valid only for New Zealand, and should be used to get the best of the deformation model
whereas New Zealand is able to derive a more precise transformation that is valid only for New Zealand
Why do you think ITRF2020 is worse than year 1998 deriviation? I would understand if you were talking about GDA2020 and its ATRF2014...
Of course New Zealand is like the most strange tectonic thingy...
Why do you think ITRF2020 is worse than year 1998 deriviation?
I didn't say that. Anyway, this ticket is mostly for @ccrook awareness who is the expert regarding NZ CRS, and might confirm or infirm my initial message