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An accurate and efficient survey system is needed for survey based private companies to survive in the business and engineering world. Accuracies of GPS-RTK (Global Positioning System-Real Time Kinematic) system and TS (Total Station) were investigated in a topographic survey. The hypothesis proposed was that GPS-RTK system could be an alternative survey for moderate accuracy projects. 5.90 ha salt ponds area became a sample for the research. Full detailed measurement was conducted by both instruments to build a contour map. Time expenditure was recorded to identify each method of effectiveness. Maximum offset of elevation was 0.054 m (polygon) and 0.098 m (detail). The survey results demonstrated that even though GPS-RTK system was not only practical and efficient (time saving reached 30% verses TS and 33% more efficient in human resources) but also yielded acceptable accurate topographic maps for moderate accuracy engineering purposes, GPS-RTK system cannot be conducted for every terrain feature.

Evaluation of GPS-RTK and Total Station for Topographic Survey and Strategic Decision in Private Companies