Hi Is there already a way to define a geoid model interpolated in projected coordinates? (some "small" countries, with just one projection, define their geoid models in that projected CRS. Recreating the grid in a geographic one adds some error)
I see that https://proj.org/en/stable/operations/transformations/gridshift.html was added in 9.2.0, but I only see these options: HORIZONTAL_OFFSET, GEOGRAPHIC_3D_OFFSET, ELLIPSOIDAL_HEIGHT_OFFSET, VERTICAL_OFFSET_GEOGRAPHIC_TO_VERTICAL, VERTICAL_OFFSET_VERTICAL_TO_VERTICAL. I am not sure if any of those apply as "VERTICAL_OFFSET_PROJECTED_TO_VERTICAL". In case it is possible, how would be the insertion of the transformation in proj.db? (something like https://github.com/OSGeo/PROJ/blob/master/data/sql/grid_transformation_custom.sql#L71 ) Thanks. Javier.
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