Research on subsidence monitoring of SBAS-InSAR mining area based on UAV DEM fusion:a case study of a mining area in Wu'an
Small Baseline Subset Interferometric Synthetic Aperture Radar(SBAS-InSAR)is widely used in mining area monitoring because it can reduce the effects of spatiotemporal incoherence and atmospheric delay.However,this technology still needs to use external reference Digital Elevation Model(DEM)to remove the contribution of terrain phase,so the accuracy of the DEM itself will directly affect the accuracy of SBAS-InSAR monitoring results.In general,the higher the accuracy of the DEM,the higher the monitoring accuracy,but it is quite difficult to obtain a wide range of DEM with high accuracy as an external reference DEM,and the cost is also extremely high.In order to obtain higher accuracy deformation monitoring results while ensuring low cost,this paper takes a mining area in Wu'an City as an example,and integrates the local high-precision UAV point cloud generation DEM with the large-scale space Shuttle Radar Topography Mission DEM(SRTM DEM)through certain technologies and means.Then,combined with fusion DEM and SBAS-InSAR technology and Sentinel-1 A data,mine subsidence monitoring and analysis were carried out.The results show that:(1)The monitoring results of SBAS-InSAR local mine area obtained by using fusion DEM as external reference DEM improved the monitoring accuracy of 2～3 mm compared to using the original DEM(SRTM DEM).(2)In the monitoring results obtained by using the fusion DEM,the points on different types of ground objects have different monitoring accuracy,and the target points monitoring accuracy of farmland dirt road is the highest,while the target points of shrub have the lowest accuracy of feature type.(3)The change of subsidence characteristics of the mining area is closely related to the advancement of the working face,and the combined action of multiple mining times similar or overlapping adjacent working faces will produce irregular mining subsidence basins.
万方数据
维普
