三角高程测量高差值应进行球差改正。
Elevation difference by trigonometric leveling shall be corrected by spherical aberration.
对提高山区三角高程测量的精度有一定的实用价值。
It has a definite value for raising the accuracy of triangulation in mountain area.
大气垂直折光是影响EDM三角高程测量精度的制约因素之一。
Atmospheric vertical refraction is the main factor which affects the precision of EDM trigonometric levelling.
传统的测量方法为水准测量和三角高程测量，它们都存在着不同的优缺点。
The traditional methods are geometrical leveling and trigonometric leveling. They have different advantage and disadvantage.
在光电测距三角高程测量中，大气折光对观测量的影响是一个非常棘手的问题。
The effect of atmospheric refraction error on observed value is a very thorny problem in EDM trigonometric leveling.
简述了全站仪不测量仪器高和棱镜高在三角高程测量中的工作原理以及实际应用状况。
The working principle and practical application of total-station meter in triangle height survey(without measuring height of meter and its prism)are introduced.
分析了单向光电三角高程测量的误差来源，在此基础上推导了最佳测站位置离测点的平距公式。
Based on the error resource analysis in one-way photoelectric triangulated heigh survey, the horizontal distance equation is drawn for optimal station away from survey point.
把全站仪三角高程的测量原理运用到城市管道工程的建设中，可以代替传统的用几何水准测量高程的方法。
Applying the measuring principle of the trigonometric leveling with total station into the construction of urban pipeline engineering can replace the traditional geometric leveling method.
采用测距三角高程法进行跨河水准测量，可以不量取仪器高，但观测值中有两类不同的观测量。
When completed river crossing leveling by means of trigonometric leveling with distance measurement, there are two types of observed values.
采用对向测距三角高程联合二等水准进行标志的高程测量。
Subtending distance measurement trigonometric leveling uniting second-class leveling is adopted to measure height.
在悬空管线测量中，对于管径大、悬空高的管线，用普通三角高程法测量很难满足精度要求，而用切线法测量则很容易达到精度要求。
When surveying major diameter and higher hanging pipeline, common trigonometric leveling can't meet precision requirement, but tangent method surveying can meet precision requirement.
在悬空管线测量中，对于管径大、悬空高的管线，用普通三角高程法测量很难满足精度要求，而用切线法测量则很容易达到精度要求。
When surveying major diameter and higher hanging pipeline, common trigonometric leveling can't meet precision requirement, but tangent method surveying can meet precision requirement.
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