Study on the Free-positioning of ETS in the PDL Track Surveying System

Hongtao Zhu, Weijun Wu, Zhiyong Wang


The station positioning by the electric total station (ETS) is the first step which must be done for the passenger dedicated line track survey and one of the important factors which influence the final surveying precision. To enhance the surveying efficiency and surveying precision, we study the principles and methods of free positioning by ETS.

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Modern Applied Science   ISSN 1913-1844 (Print)   ISSN 1913-1852 (Online)  Email:

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