Height is the vertical distance above a surface. A reference ellipsoid is a mathematical figure that approximates the geoid. The geoid is a surface of constant geopotential with which mean sea level would coincide if the ocean were at rest. The ellipsoid is an approximation because the geoid is an irregular shape. A number of reference ellipsoids are defined for use in the field of geodesy.
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http://purl.oclc.o.../ssn#isPropertyOf | |
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http://purl.oclc.o...u/qu#propertyType |