AS I see it, it's only possible to choose EGM96 and Ellipsoidal heigth as vertical datum. In Norway we use NN2000. Today I have to convert the final result into NN2000. I can not find any other solution while not using GCP.
A robust and simple solution to get from WGS84 vertical datum to NN2000 is probably what you will have to opt for. The difference between EGM96 geoid and NN2000 (HREF2018 geoid) is typically within +/- 2 meters but the HREF2018 model has a much higher resolution compared with EGM96. So better do a direct WGS84 - NN2000 transform (not use EGM96).
best Pål Herman
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