Monitoring and Analysis of the Whole Process Deformation of Baige Landslide Based on Insar and SAR and Optical Images

Baige landslide broke up twice in October and November 2018, which caused huge economic losses and extensive social impact. In this paper, Sentinel-1, ALOS-2 and Landsat8 are used to obtain the deformation characteristics of Baige landslide before and after sliding by SBAS InSAR technology, SAR offset and optical offset tracking technology. The results show that the cumulative displacement of Baige landslide reached 40 meters in the pre-sliding stage from November 2014 to March 2018, and it reached 6.4 meters from May to July 2018 before sliding. The monitoring results based on InSAR technology show that after the Baige landslide was destabilized twice from October to November, 2018, there are still obvious residual deformations on the trailing edge and the upper left side of the landslide. In the post-slide stage of Baige landslide from November 2018 to November 2021, there is still a deformation of -140mm/y at the high position of the rear edge of the landslide, and the deformation range of the upper left side of the landslide continues to expand.