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Global Positioning Systems (GPS)

GPS

The Global Positioning System (GPS) is a set of satellites broadcasting a special signal which began to be launched by the U.S. in the early 1980s.

GPS receivers make it possible to measure the distance between two points 40 kilometres apart with an accuracy of 1-2 millimetres.

Traditional surveying techniques, such as triangulation, give an the accuracy was more like 100-200 millimetres.

GPS is 100 times more accurate!! Moreover, GPS works in any weather and it doesn't require visibility between sites, which is a necessity for traditional surveying.

Continuous GPS allows monitoring of deformation continuously, or in near real-time.