Because geodetic point coordinates (and heights) are always obtained in a system that has been constructed itself using real observations, ...
The RMS error is often used as a measure of the accuracy of tic points when registering a map to a digitiser, indicating the discrepancy between known point locations and their digitised locations.
Monument - A permanent structure used to identify the location of a surveyed geodetic point. Monuments are typically constructed from concrete with a brass cap on top for identification.
 See also: Origin, Environment, Location, Geographic, Satellite
  
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