![]() We show that an approximate determination of the orthometric height of a point on the Earth’s surface can be made by a methodology which relates the orthometric height with the geopotential number C, the magnitude of the gravity vector g, and the curvature k of the plumbline, all determined at the point of interest on the physical surface. ![]() In this paper, we seek to determine the orthometric height from the knowledge of the geodetic (ellipsoidal) height and a representation for the gravity field at the surface point and without any information about the topographic mass distribution. Alternatively, recent efforts concentrate on the determination of orthometric heights from GPS derived geodetic heights (above the ellipsoid) and geoid undulations derived from detailed local geoid models using the familiar Stokes integration or FFT techniques Hence, the main problem in the rigorous definition of an orthometric height reduces to the accurate evaluation of the mean value of the Earth’s gravity acceleration along the plumbline. between the geoid and the Earth’s surface). ![]() According to its “classical definition”, it can be computed from the geopotential number of a point, using the mean value of the Earth’s gravity acceleration along the plumbline within the topography (i.e. The orthometric height is the distance, measured positive outwards along the plumbline, from the geoid to a point of interest usually situated on the Earth’s topographic surface. #GPS PATHFINDER OFFICE ORTHOMETRIC HEIGHT SERIES#International Association of Geodesy Symposiaīook series (IAG SYMPOSIA, volume 133) abstract ![]()
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