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A stable ground mark used for satellite positioning.
Also known as: Passive station marking, Satellite control mark
A GNSS control point is a stable ground mark whose coordinates are precisely known, used as a reference for satellite positioning survey.
Provides a reference point of known coordinates for satellite positioning survey.
Contexts: Maps
Replaced the triangulation network's function without replacing its pillars, since a satellite mark needs a clear sky rather than a line of sight to another station.
Contexts: Maps
A small metal plate, pin or stud set flush into a square of stable ground or concrete, often with an identifying number stamped on it.