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《Hydrographic Surveying and Charting》 2007-03
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Research on the Problem of Precision and Efficiency In EDM Trigonometric Leveling

YANG Jin-qiang1,LI Hui1,LI Jian-wen2,3(1.68011 Troops,Lanzhou,Gansu,730020;2.Institute of Surveying and Mapping,Information Engineering University,Zhengzhou,Henan,450052;3.GPS Engineering Research Center of Wuhan University,Wuhan,Hubei,430079)  
With the angle and distance measurement's precision improvement of total station instrument,EDM trigonometric leveling has become major method in leveling.At first,error effects are analyzed in the paper.Then the methods of precision improvement of EDM trigonometric leveling are discussed.In order to assess the efficiency of different methods,a concept of efficiency equation is presented.At last,an example is given to compare the precision and efficiency in different methods.
【CateGory Index】: P216
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