The rational management and control of the river can realize the effective utilization of the river resource, the effective management of the river will promote the good development of the regional ecology. Measurement of the vertical and horizontal sections and underwater topography, learning the elevation, section parameters and water surface gradient of the river, drawing the topographic maps of the river, the reservoir area and water area, providing the necessary basis data reference for the project planning and design, which is of great significance for daily maintenance and management of river, protection of river facilities, prediction of flood safety, flood fight and rescue, and elimination of hidden dangers.
In the river management measurement, the previous measurement technology mainly through RTK for detail point data collection. It is necessary to establish the signal transmission between the mobile station and the reference station, and the quality of the signal transmission would directly affect the measurement results. Moreover, the heavy workload of the river survey and the low efficiency of manual survey would directly affect the effective development of the river management. With the rapid development of LiDAR, the mobile measurement technology of 3D laser scanning has been widely used in river management. It can perform non-contact 3D scanning to the entity, quickly build a 3D model of the river through the dense massive 3D point cloud data collected. Meanwhile, the image-free photogrammetry of UAV could well solve the difficulty of data acquisition in traditional river survey technology. It provides a total new technical means to obtain the spatial 3D information of the river.
The 3D laser scanner actively emits laser through a high-precision laser rangefinder. It automatically generates precision terrain-follow flight plan and route according to the terrain and image requirement of the task area, ensures the range consistency of the acquired data. It collect data using UAV photogrammetry system, draws the high-precision overall topographic map of the river, vertical and horizontal cross-section of the line, landform and surface elements around the river. It provides a fast, mobile and flexible integrated 3D mobile measurement solution for the river management projects.
The new generation light and compact airborne LiDAR measurement system EasyScanTM W10/W30, is a integrated high-precision airborne LiDAR measurement system based on a high-performance multi-rotor platform. It is small in size and the weight is only 960g, which could effectively extend the flight time in the air. It highly integrates multiple sensors such as LiDAR sensor, high-precision IMU, professional aerial camera and etc.