[PROJ] Deformation model format proposal - part 2

[Chris Crook]

Hi All

Thanks to all who have commented on the proposal for a new format for describing geodetic deformation models for time dependent coordinate transformations.

Based on the feedback I got I have now updated the proposal with some minor changes and a lot more detail about calculations methods.  The most significant change is using a JSON format for the deformation model master file (thanks to Kristian Evers and Jeremy Palmer for recommending this).

I propose to add more information on the New Zealand use case to this, but that will not alter the main content of the proposal around format and usage of the model.

So once again I welcome any further feedback before formally submitting this as an enhancement request to PROJ.

Thanks for any suggestions you have

Best Regards
Chris Crook

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