The **orthometric (geoid) height** of a point of the Earth Surface is the distance H_{o} from the point to the geoid.

The **e****llipsoidal height** of a point of the Earth Surface is the distance H_{e} from the point to the ellipsoid.

Earth surface, ellipsoid and geoid | Orthometric height H_{o} and ellipsoidal height H_{e} |

The *geoid height above the ellipsoid (N) *is the difference between the **ellipsoidal height **and **orthometric (geoid) height**.

*N = H _{e }− H_{o}*

_{}

Where:

*N = geoid height above the ellipsoid*

*H*

_{e }= ellipsoidal height*H*

_{o }= orthometric (geoid) height** **

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