[PROJ] Tie breakers used when ordering candidate operations

[Nyall Dawson]

On Wed, 10 Feb 2021 at 08:47, Kristian Evers <kristianevers at gmail.com> wrote:
>
> Nyall,
>
> Have you had a look at https://proj.org/operations/operations_computation.html ?
> It’s a bit of a long read but it explains the logic behind what transformations are
> chosen under various circumstances.

Perfect, thanks!

Nyall

>
> /Kristian
>
> On 9 Feb 2021, at 23:38, Nyall Dawson <nyall.dawson at gmail.com> wrote:
>
> Hi list,
>
> I'm after a quick summary of what tie-breakers are used to sort
> candidate operations when a number of operations have the same
> reported accuracy.
>
> I have a vague recollection that one logic is that larger number
> transforms are picked, .i.e. " WGS 84 to GDA2020 (3)" is picked over
> "WGS 84 to GDA2020 (2)", but I may be mistaken!
>
> Is anyone able to quickly summarise the sorting order of operations or
> can direct me to the relevant part of the code for me to determine
> this?
>
> Thanks!
> Nyall
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