Application of UAV remote sensing technology in monitoring of coal mining-induced subsidence

In order to study the application of UAV remote sensing technology in monitoring of coal mining-induced subsidence, taking fully-mechanized coal mining face 011805 in Jinfeng coal mine as an example, the method of the interpretation of surface cracks, the calculation of ground settlement and the rule of surface subsidence are discussed in this paper. The results show that the flight height of UAV can be determined according to the need to identify the width of surface cracks, and for identification width of surface cracks of 2 cm in general the flight height should not exceed 143 m in the flat area. The method based on the rules of spectrum, elongation and compactness is suitable for extracting surface cracks automatically, and the image segmentation model based on edge detection and the image fusion model based on Full Lambda Schedule should be adopted when using this method to identify surface cracks. Surface subsidence and subsidence coefficient can be obtained through fitting and correcting the remote sensing elevation value of UAV, which shows that the remote sensing technology can be used to monitor coal mining-induced surface subsidence. The number of surface cracks in the fully-mechanized coal mining face is large, and they are vertical in the direction of extraction roughly; while the number of surface cracks near the face opening and crossheading is small, and they are parallel to the face opening and crossheading roughly.