Currently, Global Positioning System (GPS) techniques are becoming a much larger part of the\nsurveying industry. Many companies are now using GPS in their everyday work activities. The Real\nTime Kinematic (RTK) positioning is an integral part of topographic surveys, road surveying, constructions\nand most civil engineering applications. Normally, RTK can be used to collect the positioning\ndata successfully and quickly. The civil and construction projects are designed in ground\ndistances while RTK measurements are done in grid coordinate system, in which the distances\nbetween points are different from ground. The RTK measurements should be converted to ground\nfor compatibility with the designed. In this paper, the accuracy of three alternatives for converting\nRTK measurements to ground was studied. These alternatives are, using scale factor, using two\nground reference points and using Low Distortion Projection (LDP) surface. For the accuracy investigation\npurpose, a traverse of 14 points elongated for a distance of about 1400 m was constructed.\nIts coordinates were measured using total station, then the misclosure error was computed\nand the coordinates were adjusted. The traverse points coordinates were measured again\nusing RTK_GPS considering one of them as base point. The three studied alternatives were applied\nand the results were compared. The results show that the accuracy of the three alternatives is\nranging from 2.1 to 2.9 cm in the relative position of points to the base point. For absolute position\naccuracy, the two ground reference points alternative is the most accurate alternative with an average\nerror of 3.8 cm while the other two alternatives are almost the same with an average error\nof 12.3 cm.
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