Study on Early Identification of Landslide Hazard in Mountain Valley Area based on InSAR and Optical Remote Sensing Technology

Abstract

Landslide geological hazards are widely distributed and frequently occur in China, especially in the western high mountains and valleys where the terrain is steep and the vegetation is dense and also a large number of hidden and large-scale landslide geological hazards. To solve the problems of the early identification of landslide, we took the high mountain valley area of the Shimian-Hanyuan section of Dadu River as the research object. To conduct an early identification study of landslide hazards in the research area, we used interferometry synthetic aperture radar (InSAR) technology and optical remote sensing technology. The results of our study show that by comparing the identification results of D-InSAR, PS-InSAR, and SBAS-InSAR, we can confirm that the identification effect of SBAS-InSAR technology on landslide geological hazards in mountain valley area is the best. The comparison of the interpretation results of optical remote sensing technology and InSAR technology shows that the optical remote sensing technology can identify the landslide with obvious signs of deformation, and the InSAR technology can identify the geological hazard of the deformation landslide. Furthermore, InSAR technology and optical remote sensing technology can be used synthetically to achieve the early identification of landslide geological hazards.