Estimation of the displacements of Agatsu landslide in Kitakata-shi by Differential LiDAR Survey, and 3D-Modeling from aerial oblique photographs for emergent survey of Yabakei landslide in Nakatsu-shi

Abstract

Today's high-definition topographic data analysis and SfM 3D-Modeling technology is effective for measurement of ground displacement and estimation of landslide area. In this study, Digital Geomorphic Image Matching analysis using differential LiDAR DEMs was applied to measure wide-area ground displacements of landslide. As a result, over 6 m displacement for 2 months was quantitatively and spatially measured. In additional case study, SfM 3D-Modeling was conducted just after the large landslide occurred in mountainous region. High-definition topographic data quickly made from aerial oblique photographs was effective for emergency planning for countermeasure work.