[Proj] Understanding deformation model usage

[stevejking]

I can see t_obs is always the *grid_epoch, except when you do an inverse (by
swapping t_epoch and t_obs).



stevejking wrote
> 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?
> Can be 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 option to illustrate.
> 
> Steve
> 
> 
> 
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