stadia hairs

A new method of surveying horizontal distance and elevation difference with theodolite-central hair stadia;

经纬仪测量水平距离和高差的新方法——中丝视距法

Based on the principle of the method of central hair stadia,this paper introduced the basic principle of pseudo-stadia,a new method.

基于经纬仪中丝视距法原理,提出了伪视距测量方法。