[PROJ] Preferred grid format for transformations?

[Brian Shaw]

Hi there

The National Geodetic Survey is considering changes to the grids we 
output for transformations, geoids and more and I was wondering if there 
are currently any preferred or ideal grid formats in the PROJ 
community?  I have been doing a little research as well as seen a few 
threads recently that mentioned GeoTiff, NetCDF and HDF5 but wanted to 
see if you guys had any preferences?

A few things that will be coming in 2022 include grids for 3D 
velocities, uncertainties for grids (geoids, transformations) and more 
so some of the things discussed like having multidimensional information 
at each node would be nice.

Thanks for your time
Brian

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Brian Shaw
Geodesist
NOAA/NOS/National Geodetic Survey
Phone # 240-533-9522