基于SBAS技术的巫山县滑坡提取研究

Landslide extraction in Wushan County based on SBAS technology

目前,如何对滑坡进行早期识别并预测滑坡可能发生的位置和威胁范围是灾害管理研究中亟待解决的问题之一。以滑坡灾害较多的巫山县长江沿岸为研究区,根据滑坡发育特征,探索出了基于InSAR技术进行区域滑坡提取的方法。使用区内2017年3月至2018年11月Sentinel-1A卫星数据,利用PS InSAR(永久散射体干涉测量)技术得到SBAS InSAR(小基线集干涉测量)技术处理流程中的地面控制点,通过SBAS InSAR技术获取研究区地表形变数据。利用核密度分析法,提取地表有显著运动的区域,结合高分辨率影像和滑坡发育特征等条件进行进一步筛选,剔除伪潜在滑坡区。结果表明:在该地区发现疑似滑坡区9处,其中5个区域内包含有历史滑坡,4个区域为新发现的疑似滑坡区。

At present,how to identify landslide early and predict the location and threat range of landslide is one of the urgent problems in disaster management research.Taking the Yangtze River bank in Wushan County of Three Gorges Reservoir area as the research area,where many landslide disasters developed,based on the InSAR technology and the landslide development characteristics,the method of regional landslide extraction was explored.Based on the Sentinel-1A data from March 2017 to November 2018,the ground control points in the processing of SBAS InSAR(small baseline set interferometry)technology were obtained using PS InSAR(permanent scatterer interferometry)technology.The surface deformation data of the study area were obtained by SBAS InSAR technology.By using the nuclear density analysis method,the area with abnormal deformation was extracted,and according to high resolution images and landslide development characteristics,the landslides were further screened to eliminate the pseudo-submersible landslide area.Finally,9 suspected landslide areas were found in the area,including 5 historical landslides and 4 newly discovered uncertain landslides.