2025 Volume 81 Issue 13 Article ID: 24-13527
This paper proposes a method to measure the amount of difference in road surface steps caused by an earthquake using LiDAR (Light Detection And Ranging), which measures the distance to an object and the shape of the object based on the information of reflected light from a laser beam. It is not possible to acquire point cloud data for the area shielded by an object. Thus, when a step is viewed from the top to the bottom, the Euclidean distance between two points cannot be obtained because there is an invisible area where the point cloud data of the step cannot be acquired. Therefore, in this study, the amount of step is obtained by approximating the point cloud data of the road surface to the equation of a plane in three-dimensional space, and the accuracy of this method is examined. As a result, we confirmed that by taking into account the invisible area, the amount of the step can be calculated more accurately for the step directly in front of the LiDAR equipment.
