摘要
本文从理论上分析了T2000测距三角高程的各项误差,提出了按跳点法观测的垂线偏差影响公式和精度达0.2毫米的量高方法,讨论了减弱大气垂直折光影响的措施。通过150公里的比较试验,得出了S≤500米,α≤10°按跳点法观测或S≤1公里、α≤8°按对向测距三角高程均能达到二等水准精度要求的结论。
In this paper the errors for EDM trigonometric leveling are analysed in theory. The formula is provided on influence of deflections of the vertical for jump-point method. It is discussed that the steps reduce the influence of atmospheric vertical refraction error. The method of measuring instrument height is presented, that mean spuare error is smaller than 0.2mm. The experiment have been made, it is shown that should substitute trigonometric leveling for the second leveling, when s≤500m、α≤10°, according to jump-point method, or when s≤1kin、α≤8°, in accordance with trigonometric leveling.
出处
《测绘科学技术学报》
1991年第4期3-14,共12页
Journal of Geomatics Science and Technology
关键词
跳点法观测
垂偏影响
大气垂直折光影响
Measuring of jump-point, Influence of deflections of the vertical, Influence of atmospheric vertical refraction
