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GPS is effectively used in science and engineering since the release of official IGS precise orbits in 1994. Various surveying and processing methods are available for GPS, and the accuracy level depends on the method used. It is useful to predict the accuracy of GPS prior to a field survey for the purposes of network design. Today, accuracy prediction formulas are available for relative positioning that requires two or more GPS receivers. Precise Point Positioning (PPP) from NASAs GPS software GIPSY revolutionized the GPS processing since it provides methods leading to mm...