Geodetic Control
Exercise Three
1)
Compare four different height systems (ellipsoidal, orthometric, normal, and
dynamic heights) and establish relationships among the four systems.
Difference:
1, Reference Surface
Ellipsoidal Height ’s reference surface is reference ellipsoid, Normal Height’s
reference surface is quasigeoid, while both Dynamic Height Orthometric Height’s
reference surfaces are geoid.
2, Definition
Ellipsoidal Height: distance h along the surface normal between a point to the
surface of the ellipsoid.
Normal Height: the distance between the earth’s surface to the quasigeoid, along
the plumb line of point Pi.
Orthometric Height: The geometric distance between geoid and the point, along
the plumb line of a point Pi.
Since Negative of gravity potential difference between a point and the geoid
Dynamic Height : Geopotential number divided by a constant gravity gR
Ellipsoidal Height
Ellipsoidal Height: distance h along the surface normal between a point to the
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 Spring '07
 KADY
 Geodesy, Trigraph, Reference ellipsoid, Pi Pi

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