[PROJ] Preferred grid format for transformations?

[Even Rouault]

> Returning to the question above, that
> gives us 23 values (and rising) on the time axis. Whether that is too large
> or not I don’t know.

Yes that would be manageable. libtiff would have issues with more than 65536 
IFDs in a file, but the efficiency limit is probably lower.

Even

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