Orthometric vs ellipsoidal height

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.

 

msl_geoid_ellipsoid_2.png Ho_He_2.png
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:

When to use the Geoid Height Above the Ellipsoid function

How to define Pix4D outputs with respect to a geoid model

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