Normal height; computed from
Sunday, April 13th, 2008Normal heights are heights above sea level, one of several types of height
which are all computed slightly differently. Alternatives are:
orthometric heights and dynamic heights.
The normal height <math>H*</math> of a point is computed from geopotential
numbers by dividing the point’s geopotential number, i.e. its geopotential
difference with that of sea level, by the average, normal gravity computed
along the plumbline of the point. (More precisely, along the ellipsoidal
normal, averaging over the height range from 0 — the ellipsoid — to
<math>H*</math>; the procedure is thus recursive.
Normal heights are thus dependent upon the reference ellipsoid chosen. The
Soviet Union and many other Eastern European countries have chosen a height
system based on normal heights, determined by geodetic precise levelling.
Normal gravity values are easy to compute and “hypothesis-free”, i.e., one
does not have to know, as one would for computing orthometric heights, the
density of the Earth’s crust around the plumbline.
Normal heights figure prominently in the theory of the Earth’s
gravity field developed by the school of M.S. Molodenskii. The reference
surface that normal heights are measured from is called the quasi-geoid, a
representation of “mean sea level” similar to the geoid and close to it,
but lacking the physical interpretation of an equipotential surface.
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