Abstract:
Three-dimensional information of ship surfaces can show the shape and structure of ship surface in all directions, which is convenient for the design, installation and ship maintenance of on-board equipment. By using oblique photogrammetry and 3D laser scanning techniques, one can acquire 3D information of the targeted surface. However, the single data acquisition technique still suffers from the problem of incomplete coverage of the surface information. In order to achieve technological complementarity, a multi-view synergistic integrated measurement scheme of ship surface 3D information from airborne and ground base stations is proposed. The information on the top of the ship can be obtained by using UAV oblique photogrammetry or UAV-borne laser scanning, and the information on the side and bottom of the ship is obtained by using terrestrial laser scanners. The data among the sites are registered by control points. The experiment takes the vessel “Xiangyanghong 18” as an example, the average deviation and standard deviation of the point cloud coordinates of the UAV oblique photogrammetry are 0.133 m and 0.127 m, respectively. And, the average deviation and standard deviation of the point cloud coordinates of the terrestrial laser scanner are 0.040 m and 0.018 m, respectively. The overall deviation and standard deviation of the ship surface point cloud are 0.087 m and 0.091 m, respectively. The overall length, depth and breadth of the ship based on the ship surface point cloud measurements have small errors from the official values, which are 0.069 m, 0.125 m and 0.143 m, respectively. The effectiveness of the fusion of oblique photogrammetry and laser scanning techniques for the acquisition of three-dimensional information on ship surfaces is verified. The same approach can be used to obtain surface 3D information for other similar targets.