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 Ho and Ellipsoidal Height He |

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 *

** **