[Proj] Understanding deformation model usage

[stevejking]

Kristian,
I think I follow your (in development) user guide example here. Very useful
thanks.
https://kbevers.github.io/usage/operations/transformations/deformation.html

But if the velocity shifts are tied to Cartesian coordinates, surely this is
only the average velocities at the coordinate at a moment in time. There is
no parameter to specify a *grids_epoch.

Eg. What to do If my grid is Cartesian coordinates and velocities at epoch
2010.0, t_obs=2000.0 and t_epoch=2017.0?
Perhaps this is achieved by ensuring in individual steps that t_obs or
t_epoch always equals *grids_epoch ? I think that’s what your example does?

*grids_epoch is a made up function to illustrate.

Steve



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