Development of Analytic Method for Landslide Measurement by Movement Vectors Using S-DEM Data Obtained from Airborne Laser Point Clouds

Abstract

Airborne laser measurement has been widely known as a surveying technique for acquiring topographic data with a high accuracy, and it has been lately utilized as a differential analysis for evaluating the amount of the sediment caused by a large-scale landslide. However, it is impossible to detect landslide behavior at speed of a few centimeters using aerial laser measurement. In this study, we have developed the analytic method to evaluate landslide variation amount with a high accuracy by discriminating characteristic land features from digital elevation model, which is called S-DEM or Substratum Digital Elevation Model, using laser point clouds at the position shifted from the ground with an arbitrary distance. We also describe the result that it is possible to predict the movement of debris slide occurred in the area of landslide using the method we developed.