Evaluate Accuracy Between RTK GPS and Total Station in Adjustment Closed Traverse Using the Least Square Method

Abstract

The necessity to implement high precision engineering projects requires the use of precise surveying equipment. The most surveyors currently used high precision instruments like of the Global Position System GPS and the Total Station TS. The aim of this research is evaluation the precision assessment between Real time kinematic RTK GPS and TS via measuring of close traverse by applying the least square method by using Map check tool in Civil3D program. Furthermore, two-dimensional 6 points closed traverse was recognized and include at the Higher Instate for Building Treads and Construction campus, Benghazi city-Libya. This study the accuracy difference between the instruments is through adjustment of 6 points closed traverse. Root mean square error RMSE and standard deviation SD  were used to  evaluate the accuracy and precision of the measurement by RKT and TS. The accuracy of the RTK device was better than the TS device with absolute errors 0.057 m and RMSE for East 0.018 m, and North 0.021 m besides SD= 2.53. RKT can measure points without any line of sight requirement. However, RTK based survey is not only practical and efficient but also time-saving than TS and more efficient in human resources. Therefore, investment in RTK GPS system might be worthwhile. 

Keywords: RKT GPS, Total station, closed traverse, least square, Civil3D software.