The Gravity field and steady-state Ocean Circulation Explorer (GOCE) is dedicated to measuring the Earth's gravity field and modelling the geoid with extremely high accuracy and spatial resolution.
A precise model of the Earth's geoid is crucial for deriving accurate measurements of ocean circulation, sea-level change and terrestrial ice dynamics - all of which are affected by climate change. The geoid is also used as a reference surface from which to map all topographical features on the planet. More information about the geoid can be found in 10 reasons why Al Gore needs the geoid. Warning: The latter link is self promotion :-)
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