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Geoid represents the equipotential surface with best approximates the mean sea level.
It is considered as the reference surface for a definition of heights.

Gravimetric geoid determination for New Zealand

In this project the terrestrial and altimetry-derived marine gravity data (combined the state-of-art satellite gravity model) are used to determine a new regional gravimetric geoid/quasigeoid model for New Zealand.

Find out more about gravimetric geoid determination.