[PROJ] WGS 84 to GDA2020 in EPSG

[Javier Jimenez Shaw]

Hi

Preparing a talk for FOSS4G Europe in Tartu (see you there if you come!), I
found that the 3 transformations  in EPSG from WGS 84 to GDA2020 (2, 3 and
4) they all have 3m accuracy.
That is not giving a clue to PROJ about which one is better.

(2) is a null Helmert transformation.
(3) is a Helmert with 7 numbers
(4) uses a grid.

Is there anybody from the Australian agency here? Is there any reason why
the three transformations have the same accuracy? I would expect different
values. I looks like a copy-paste issue.

The same happens with the transformation from WGS 84 to GDA94.

Thanks,
Javier

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