Precision analysis of continuous trigonometric leveling based on the opposite middle method
Along with the application of modern high-precision total station,the total station mode trigonometric leveling is gradually applied to the general leveling work,in which the opposite observation and the middle method observation are two commonly used trigonometric leveling modes,the effect of balloon difference can be reduced effectively by opposite direction observation,and the effect of instrument high measuring error can be eliminated by middle method observation,the two modes can also reduce the influence of prism high measurement error.According to the advantages of the two models,a continuous trigonometric leveling model based on the opposite middle method is proposed in this paper,based on the simulation and calculation of two kinds of observation methods:the number of equal stations and the number of stations with different distance and the length of equal route,this paper summarizes the variation law of the error in the continuous trigonometric leveling with the opposite middle method per kilometer observation height difference,the influence of station distance,route slope,instrument height measurement and prism height on observation height difference accuracy is analyzed,it is concluded that the continuous trigonometric leveling model based on the opposite middle method can theoretically achieve the long-distance trigonometric leveling with second-class leveling accuracy.
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