Land Information New Zealand have published NZVD2016 quasigeoid, a grid suitable for conversion between ellipsoidal and orthometric heights. Can we get this grid for use with FME?
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Esri has created a grid usable within FME for vertical datum conversions. You can download the grid from:
http://pm.maps.arcgis.com/home/item.html?id=9574c2281c524e3083d74285b39dc508
Inspired and enabled by Dave's fine work here.