DEM construction method of land surface subsidence and deformation based on airborne LiDAR technology
Airborne light detection and ranging(LiDAR)technology is used in this paper to solve the problem that it is difficult to monitor the large-scale land surface subsidence and deformation in mining area.The results show that the improved progressive densified triangulation filtering algorithm and local polynomial interpolation method are used to process the airborne LiDAR point cloud data,and a high-precision subsidence and deformation digital elevation model(DEM)can be obtained,and the monitored subsidence and deformation error can be controlled within 50 mm by point cloud noise reduction,filtering and interpolation.Airborne LiDAR technology can be used to monitor large-scale land surface subsidence and deformation due to the reasons that it not only overcomes the shortcomings of traditional photographic surveying,but also can not be affected by external environmental factors such as topography and landform.Therefore,the technology is of great significance for subsidence and deformation monito-ring in the mining area,reasonably designing the mining face and protecting the surface buildings in the subsidence area.
land subsidence and deformation monitoringairborne LiDARfiltering algorithminter-polation methodDEM
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