Hi I am a bit confused with the epoch of coordinates. For instance, if I connect to this NTRIP service https://support.swiftnav.com/support/solutions/articles/44002386941-configuring-your-receiver it says explicitly that "Skylark Nx RTK uses ITRF2020 reference frame." Does it mean that the coordinates that I measure today do have an epoch of 2024.x (today's epoch), or the epoch of those measurements is 2015.0 (the epoch of ITRF2020 https://epsg.org/datum_1322/International-Terrestrial-Reference-Frame-2020.html )
If I want to transform from that reference system (ITRF2020) to, let's say, ETRS89 or NAD83(2011), should I add an epoch? which one? where? what happens if I do not set any? I have the impression that I could convert from one epoch to another for the same CRS, something like this PROJ_DATA=data ./bin/projinfo -s EPSG:9989 -t EPSG:9989 --s_epoch 2015.0 --t_epoch 2020.0 -o proj Candidate operations found: 1 ------------------------------------- Operation No. 1: unknown id, Null geographic offset from ITRF2020 to ITRF2020, 0 m, World. PROJ string: +proj=noop ... but it does not. Should it do a non noop transformation? Note: s_epoch and t_epoch were added in PROJ 9.4 Thanks. PS. ITRF2020 to CH1903+ is a complete ballpark :( .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__
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