Using electron theodolite dummy photograph observing tunnel border displacement, as the example, the authors analyse the principle, means and precision of the system.
并以其中电子经纬仪虚拟照片法观测隧道周边位移为例，分析了系统的原理、使用方法及其精度。
2
The displacement vector for surface relief was determined to be near the invariant line direction using electron back scattering diffraction method.