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This text delves into the height relationships in geophysics, illustrated by the KAGRA project. KAGRA uses parameters such as ellipsoidal height (He), orthometric height (Ho), and geoid height (Hg) to elucidate the Earth's shape and gravitational field. The connection between these heights is defined mathematically. The radius of the GRS80 ellipsoid is crucial for understanding geoid models and their relevance in precise height measurements. This knowledge is pivotal for geolocation, geodesy, and Earth sciences research.
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KAGRA Location He (ellipsoid height) = Ho(orthometric height) + Hg (geoid height) H; radius of GRS80 of ellipsoid earth Hg; height of geoid surface from GRS80 surface Ho: height from geoid surface