Vertical Take-Off And Landing Fixed-Wing UAV Photogrammetry Mining Subsidence Monitoring Application

Surface subsidence deformation caused by coal resource mining is a core issue that restricts the sustainable development of the current ecological environment.The monitoring of surface subsidence in areas affected by coal mining has always been a basic work carried out by the industry.However,with the continuous update and progress of surveying and mapping methods,the existing monitoring methods have become more and more constrained in terms of monitoring efficiency,data quality,and difficulty in implementation.For example,the existence of various monitoring methods to varying degrees can only obtain a small number of points.Unilateral or multi-faceted issues such as information,on-site measurement difficulties,low data accuracy,and fixed overlapping frequencies have restricted the demand for comprehensive real-time monitoring of mining areas.Aiming at the needs of large-scale subsidence and real-time and efficient monitoring of mining areas,this paper independently built a set of vertical take-off and landing fixed-wing UAV systems;with the goal of fine monitoring of mining subsidence,aerial survey scheme design was carried out,and the degree of overlap,altitude,and altitude were determined.Ground resolution and other parameters,and designed eight image control point layout plans for comparative analysis,comprehensively considering the convenience of the layout,field workload,accuracy and other factors,it is considered that the layout of the image control points at the four corners and the surrounding edges is the best Plan;combined with the mining progress and terrain conditions of the 61202 working face of Tangjiahui Coal Mine in Inner Mongolia,the aerial survey plan obtained by the research is used to obtain the image data of the two phases of the monitoring area,and the progressive triangulation encryption filter algorithm,morphological filter algorithm and cloth simulation filter algorithm are used to The original point cloud is processed to remove noise.Research shows that the cloth simulation algorithm is simple,and the operating speed is much higher than the other two algorithms under the premise of ensuring accuracy.Therefore,the cloth simulation algorithm is used to filter the two original point clouds to obtain ground points;The two phases of the obtained ground point clouds are superimposed to obtain the sinking basin,and the two survey lines of the strike and the inclination of the subsidence basin are extracted for the dynamic parameter inversion of the probability integration method.The strike Z1 survey line is used to calculate the predicted subsidence obtained by the inversion parameters.Compared with the measured value,the error is the smallest,which is 227.44 mm,which can more accurately reflect the law of ground subsidence.The vertical take-off and landing fixedwing UAV system independently built in this paper can efficiently obtain the dynamic subsidence basin of the mining area in a short period of time,provide intuitive and abundant subsidence data,and apply it to the parameter search to obtain reliable predicted parameters in the mining area.A complete set of data acquisition and processing procedures provides important data support for ecological restoration and environmental assessment in mining areas.