The principles of fixed-point photography include

Same object, same camera, and so on. The method of fixed-point photography should follow the principle of "five similarities", that is, the same object, the same camera, the same height, the same place and the same fixed point. Fixed-point photography mainly causes invisible pressure to all departments through the comparison of the situation before and after the scene and the horizontal comparison of different departments, and urges all departments to make rectification measures.