The orthometric (geoid) height of a point of the Earth Surface is the distance Ho from the point to the geoid.
The ellipsoidal height of a point of the Earth Surface is the distance He from the point to the ellipsoid.
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| Earth surface, ellipsoid and geoid | Orthometric height Ho and ellipsoidal height He |
The geoid height above the ellipsoid (N) is the difference between the ellipsoidal height and orthometric (geoid) height.
N = He − Ho
Where:
N = geoid height above the ellipsoid
He = ellipsoidal height
Ho = orthometric (geoid) height
More information on this topic can be found in the following articles:
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