联合LiDAR DEM与时序SAR数据的露天矿特大型滑坡监测

Collaborative Monitoring of Open Pit Mine Induced Large Scale Landslide with LiDAR DEM and Time Series SAR Data

面向长期多阶段大型滑坡变形监测需求,提出了一种像素偏移量跟踪(pixel offset tracking,POT)与多时相雷达干涉测量(multi-temporal interferometry,MTI)协同监测方案,分别针对滑坡的快速变形期及缓慢变形期开展变形监测研究.针对时序SAR滑坡监测中面临的观测方向与滑坡变形方向的空间不一致问题,提出了一种高精度激光雷达(light detection and ranging,LiDAR)数字高程模型(digital elevation model,DEM)辅助的坡向变形求解方法,并开展了抚顺西露天矿南帮特大型滑坡长时序变形监测,其结果与GPS监测结果相比平均误差仅为dm级.

A collaborative monitoring scheme combining pixel offset tracking(POT)and multi-temporal interferometry(MTI)is proposed,where POT is used during rapid-movement period and MTI is used during slow-movement period.Targeting at the spatial inconsistency between the azimuth-line of sight(Az-LOS)measurements and downslope landslide displacements,a light detection and ranging(LiDAR)digital elevation model(DEM)based conversion method from Az-LOS to downslope direction is also proposed and adopted in the long-term displacement monitoring of the large scale landslide on the south slope in Fushun west open pit mine.By comparing the estimated downslope displacements with GPS measurements,mean error of decimeter level is achieved.