In three-dimensional space a triple of coordinates is needed to define the position of a point. Coordinate or reference systems are used for a consistent representation of all spatial points. If points are subject to motion relative to the reference system, then the coordinates are time-dependent. In this case, three-dimensional space is complemented by one-dimensional time.
KeywordsZenith Angle Rotation Matrix Dead Reckoning Unknown Point International Terrestrial Reference Frame
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