Comparison of landslide displacement by differential interferometric SAR analysis and LiDAR data

Abstract

  In this study, we compared the amount of movement obtained by DInSAR analysis and LiDAR for the Shirakouchizawa landslide located near Mt. Asahi, the northern Japanese Alps, to investigate the characteristics of the landslide displacement detected by DInSAR analysis. The actual amount of movement calculated from the LiDAR data was converted to the amount of movement in the line-of-sight (LOS) direction. We used measurement sensitivity as an index that indicates how much the LOS of the DInSAR analysis differs from the actual amount of movement due to LiDAR LOS depending on the slope direction and angle. As a result of comparing the two methods, the LOS of the DInSAR analysis was close to the actual displacement at the location with high measurement sensitivity, and the value of that was smaller than the actual displacement at the location with low measurement sensitivity.