【摘要】 在水利工程测量中，用光电测距三角高程代替水准测量，尤其是三、四等水准测量，既可以节省时间，又可以保证精度，值得推广应用。更多还原

【Abstract】 There are many factors that restrict to improve the accuracy of survey including the indirect or trigonometric leveling. In this paper , some methods for eliminating these factors , mainly for the vertical angle observation in the indirect leveling applying the geodimeter are hereby introduced ,for instance ,that the " Three-wire method" which is suitable for plain and " central hair method" which is suitable for rolling region is introduced. Besides ,methods for correcting the effect of the atmosphere refraction and for eliminating the errors in measuring the instrument height are described as well.更多还原