Based on the metallogenetic environment and the special landform of this area, high-precision magneticsurveying was performed along valleys and rolling ridges at random networks.
In the humanity history, it is one most ancient measuring technique surveying the direction using the Earth magnetic field.
利用地球磁场来测量方向是人类历史上最古老的测量方法之一。
3
This paper gives a brief description of various kinds of facilities, reconnaissance and surveying, and design of transit marks of a swinging ground for magnetic compass adjustment.