Landslide Extraction from Airborne Lidar Data in the 2018 Hokkaido-Eastern-Iburi Earthquake

Wide spread landslides were extracted from airborne LiDAR data acquired before and after the 6 September 2018 Hokkaido-Eastern-Iburi earthquake. By taking the difference of Digital Surface Models (DSMs) from the LiDAR datasets, the failed slopes and accumulated soils were recognized. Since the pre-event dataset was obtained 12 years before the earthquake, the growth of trees was estimated based on forest registry block data. The adjusted DSM difference was compared with the visual inspection result of aerial photos by the Geospatial Information Authority of Japan and the accuracy of the confusion matrix was discussed.