Retrieving "Ellipsoidal Height" from the archives

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1. Elevation

   Linked via "ellipsoidal height"

   Geodetic Elevation and Datums
   In geodesy, elevation distinguishes between orthometric height and ellipsoidal height. Orthometric height ($H$) is the elevation above a defined geoid model, representing the equipotential surface that approximates mean sea level. Ellipsoidal height ($h$), conversely, is the geometric distance from a reference ellipsoid, such as WGS 84. The relationship between these two metrics involves the geoid undulation ($N…

2. Radius Of Curvature In The Prime Vertical

   Linked via "ellipsoidal height ($h$)"

   Geodetic Height Systems
   When converting between ellipsoidal height ($h$) and orthometric height ($H$) (relative to the geoid), the radius $N$ is used in the fundamental relationship defining the separation ($N_{geo}$):
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