摘要
ＧＰＳ测距三角高程是精化大地水准面的一种很好方法［１］，然而影响测距三角高程的误差源主要来自大气折射（如何减弱它将在另文讨论）和垂线偏差，后者在山区的影响更不可忽视。本文将对这一问题作一分析，同时讨论了利用重力、地形数据确定垂线偏差及其误差，并指出只要按此方法计算，其改正项的精度可以满足不大于１″的要求。此外，还介绍了用地形高代替重力来计算正高。
GPS Range trigonometric leveling is a better method used in refinement of geoid . The main error influences in range trigonometric leveling come from atmospheric refraction (it will be discussed in another paper) and vertical deflection. The influence of the later should not be neglected particularly in mountain fields. and it is analysed in this paper, that the vertical deflection and its error which are computed with gravity anomaly and topographic data are discussed. The precision less than 1″ of it's correction may be achieved by the mentioned method. In addition, the gravity correction of orthometric height and normal height calculated by use of topographic data are introduced.
出处
《测绘学报》
EI
CSCD
北大核心
1997年第1期58-64,共7页
Acta Geodaetica et Cartographica Sinica
基金
中科院测地所动力大地测量学开放实验室资助
关键词
测距
三角高程
垂线偏差
距离测量
Range trigonometric leveling, Vertical deflection, Gravity, Topography
