Tag Archive for Tag: Terrestrial Reference System

Tag: Terrestrial Reference System Geoids and ellipsoids

8.1 Definition of the geoid The purpose of engineering surveying is to find the relative positions of points in three dimensions; so a 3D co-ordinate system is needed to record the findings. The one absolute direction which can always be found is ‘up’, using nothing more sophisticated than a plumb bob. For this reason alone, it makes sense to define

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