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...=utm1>{{cite web |title=Defense Mapping Agency Technical Report TM 8358.1: Datums, Ellipsoids, Grids and Grid Reference Systems |url=http://earth-info.nga.mi ...e projection coordinates to true positions in three-dimensional space. The datums and reference ellipsoids associated with particular implementations of the ...

[[Vertical position]] can be expressed with respect to a given [[vertical datum]], by means of physical quantities analogous to the [[topography|topo ...