升降轨Sentinel-1数据在滑坡形变识别中的适用性研究

Research on Applicability of the Ascending and Descending Sentinel-1 Data in the Identification of Landslide Deformation

针对采用合成孔径雷达干涉测量(InSAR)技术开展滑坡灾害大区域调查和普查时,Sentinel-1雷达数据源升降轨模式难以恰当选用,或应用场景不适宜,从而否定InSAR技术在滑坡形变识别及监测的优势等问题,本文采用时序InSAR技术,结合升降轨的Sentinel-1雷达数据源,开展不同坡向滑坡形变的识别,研究Sentinel-1雷达数据源升降轨道模式在不同坡向滑坡灾害形变识别与监测中的适用性情况,分析Sentinel-1雷达数据源不同轨道模式对不同坡向滑坡识别与监测的优势。研究结果表明,Sentinel-1雷达数据源对大型及以上的滑坡灾害进行InSAR滑坡表面形变识别及监测结果较佳;Sentinel-1降轨数据源更适用于识别和监测西坡向、南坡向的滑坡,Sentinel-1升轨数据源更适用于识别和监测东坡向的滑坡;采用Sentinel-1升降轨数据联合的方式,更有利于东、西、南坡向滑坡识别和监测,可以更全面识别潜在滑坡灾害。

When carrying out large-scale survey and census of landslide hazards based on Interferometric Synthetic Aperture Radar(InSAR)technology,the Sentinel-1 radar data source ascending or descending mode is difficult to select properly,or the application scenario is not suitable,thus denying the advantages of InSAR technology in landslide deformation identification and monitoring.By using time-series InSAR technology and combining with Sentinel-1 radar data source of the ascending and descending,the identification of landslide deformation in different slope directions is carried out.The applicability of the ascending and descending mode of Sentinel-1 radar data source in identifying and monitoring landslide disasters in different slope directions is studied,and the advantages of different track modes of Sentinel-1 radar data source in identifying and monitoring landslides in different slope directions are analyzed.The research results show that the Sentinel-1 radar data source has better results in InSAR landslide surface deformation identification and monitoring for large and larger landslide disasters;the Sentinel-1 descending data source is more suitable for identifying and monitoring west slope and south slope.For landslides,the Sentinel-1 ascending data source is more suitable for identifying and monitoring landslides in the east-slope direction;the combination of Sentinel-1 ascending and descending data is more conducive to the identification and monitoring of landslides in the east-west and south-slope direction,and can more comprehensively identify potential landslides disaster.