[PROJ] Tie breakers used when ordering candidate operations

[Lesparre, Jochem]

Greg wrote:
>  People talk about WGS84

Everyone should stop doing that and avoid EPSG:4326 at all times. ITRS is the one official international system, recognised by the UN.


Greg wrote:
> ITRF2008 is pretty much the same thing as WGS84(G1762) ), and ITRF2014

The major difference is that WGS84(G1762) is really messy at centimetre-level. It ignores the tracking station velocities during the year and uses an annual step-wise update (at a random date in January) of tracking station coordinates used to generate ephemeris broadcast message.
https://earth-info.nga.mil/GandG/publications/NGA_STND_0036_1_0_0_WGS84/NGA.STND.0036_1.0.0_WGS84.pdf


Greg wrote:
> So, I think people who ask for transforms to WGS84 should be told "That doesn't really make sense any more; I will assume you mean WGS84(G1762) which is basically the same as ITRF2014" and then you should use those transforms instead.

That is what I am doing all the time, except that I first ask them "Do you really want time-dependent international coordinates? Otherwise, I will assume you mean ETRF2000".


Regards, Jochem


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