Control Surveying

Control surveys are used to establish highly accurate positions (horizontal control) and elevations (vertical control) of select points or stations.The points are then used to reference other survey observations or measurements.Typically, a few well-placed horizontal and vertical control stations are established by very precise measurements, using the best equipment and methods available forming what is called the primary control.

Additional control stations located across the project area may be added using less precise measurements to form the secondary or “supplemental” control. This type of control, while less accurate, is more readily found, less expensive to establish, and more convenient to use.For small areas such as a subdivision or even an open-pit mine, usually only one control system, corresponding to the secondary control described above, would be needed.Control surveys can be horizontal and/or vertical, and plane or geodetic surveys

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