Construction of Three-dimensional data Using Unmanned Aerial Vehicle and Terrestrial Lase Scanner for River Maintenance

Abstract

River structures play a role of preventing flooding in the event of a disaster, and its shape continues to change constantly. It is necessary to inspect and grasp its shape. In order to improve the efficiency of river maintenance, the authors proposed a river maintenance system using three-dimensional point cloud data obtained by unmanned aerial vehicle (UAV). However, since it was measurement from the sky over the river, it was difficult to construct three-dimensional data of revetment and bridges. In this research, three-dimensional data was constructed using UAV and terrestrial laser scanner to solve the problem of the preceding research. As a result, the environment was constructed that it not only grasps the river shape in three dimensions, but also manages periodic inspection records and photographs at accurate positions in three dimensional space.