Land Surveying Videos

Geodetic Control in Land Surveying: Active vs. Passive

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Developed in partnership with COMET Program/MetEd, this video explains the difference between active and passive control methods in surveying, and the strengths and weaknesses of each. Passive control is the traditional method of referencing positions to physical benchmarks that have known locations. Active control references positions to one or more Continuously Operating Reference Stations (CORS). These stations use continuous contact with global navigation satellite systems (GNSS/GPS) to provide a highly accurate and updated position. Original video source: