Abstract：Research purposes ： After the adequate theoretical analysis and study of the features that long aerial parts and high accuracy of measurement are required in the ballastless high way engineering project，a new method of trigonometric leveling without the height of equipment together with the prism is presented in this paper, and this method can solve the difficult of surveying between railway girder precision adjustment in vertical control network above the bridge and ground vertical control network during the construction of the passenger dedicated line.
Research conclusions ： This new method not only contains the free stationing feature of leveling but also eliminates the error by virtue of the height measuring of the equipment and the prism during surveying with high feasibility and efficiency. It is proved this is a good way to solve the problem between railway girder precision adjustment in vertical control network above the bridge and ground vertical control network during construction. Comparative analysis is made in this paper to prove the new method is much more superior than that of traditional trigonometric leveling. The precision can satisfy second - order leveling under observation conditions of suitable distance( ≤60 m) and suitable vertical angle (≤20°) if a suitable Total Station is used.
孙永利，刘成. 一种三角高程测量新方法的应用研究[J]. 铁道工程学报, 2008, 25(12): 1-4.
SUN Yong-li, LIU-cheng. Applicable Research on a New Method of Trigonometric Leveling. 铁道工程学报, 2008, 25(12): 1-4.
2008, Vol. 25 
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