[gdal-dev] Motion: adopt RFC 81: support for coordinate epochs in geospatial formats

[Howard Butler]

> On May 24, 2021, at 5:39 PM, Sean Gillies <sean at mapbox.com> wrote:
> 
> Howard, are you suggesting that there should be a configuration option to opt in to this new feature?

Yes, I think it should be explicitly opt-in, not silently opt-out for the time being.


> On May 24, 2021, at 6:15 PM, Even Rouault <even.rouault at spatialys.com> wrote:
> 
> The mere introduction of this new capability isn't going to change any behavior. It is only going to change behavior if people do add a coordinate epoch in their datasets, and in that case, one can expect them to want more accurate coordinate transformations. That said adding a config option in the OGRProjCT class to ignore the coordinate epoch is trivial...
> 


I'm glad you are getting traction with the various format groups on the topic, but that process is going to take a very long time to matriculate, and in many cases official blessing won't ever be pronounced. Let's make the behavior for applying the transformations *and* writing the metadata an explicit opt-in.

Howard