ellipsoid height
the height of an object above the reference ellipsoid in use. This term is generally used to qualify an elevation as being measured from the ellipsoid as opposed to the geoid. GPS systems calculate ellipsoidal height.
LDART uses the National Geodetic Survey model, GEOID99, for conversions between NAD83 ellipsoid heights and NAVD88 orthometric heights. The GEIOD99 model is less accurate near the coast.
The difference between the topographic elevation and the ellipsoid is called the ellipsoid height.
The difference between the topographic elevation and the geoid is called the orthometric height.
from the potential difference of the reference equipotential surface and the actual point, while the potential difference can be determined with the combination of spirit levelling and gravity measurements. In order to convert the ellipsoid height ...
 See also: Geoid, Area, Satellite, Ellipsoid, Geodetic
  
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