Domestic Airborne LiDAR Technology And Its Application In Electric Power Transmission Line In

As the airborne LiDAR technology matures, in terms of airborne LiDAR hardware devices, Europe and other developed countries have made a lot of achievements and formed a commercial product. Airborne LiDAR technology research started relatively late at home. The most research focuses on Data processing. The research of hardware is still in its infancy in China, the existing technical foundation is weak. Due to reasons such as technology policy, there were no high precision of INS system and reliable performance of the laser ranging device in domestic before.There were no mature airborne LiDAR system. In recent years, with the support of national key projects, Chinese Academy of Surveying and Mapping combining with several units successfully developed the first set of domestic airborne LiDAR system. In this paper, the main research results are as follows:(1) The main theoretical basis of system integration is briefly expounded. The important theories of the system integration are inertial navigation principles, GPS differential principle and integrated navigation principle. According to the principle of integration and to achieve the function of the target, we choose appropriate stand-alone device.(2) The resulting of airborne LiDAR system is point cloud data.The point cloud computing process is actually a series of coordinate conversion process. Combined with the structure property of the instrument, coordinate system definition and angle definition, according to the domestic airborne LiDAR integration mode, coordinate transformation formula for computing the point cloud is derived. The mathematical model is established.(3) This paper mainly introduced the laser scanner and SWDC single lens digital aerial camera calibration principle and method. The integration of POS with camera calibration principles and methods is discussed. The integration of POS with laser scanner calibration principles is also discussed. The rationality of the method is verified by the experimental results.(4) According to the principle of airborne laser LiDAR, the position of camera, POS and laser scanner should be fixed. After many test, the ideal way of integration was founded. Stand-alone devices communicate with each other by lines. Stand-alone devices communicate with industrial computer by lines. This article briefly illustrated the line connection and system control principle.(5) On the basis of system integration, multiple flights were implemented. Flight operation procedures and matters needing attention were summarized from three aspects of reconnaissance, planning and flight. Processing flight data, author got DEM, DOM, DSM, DLG,3d models, and other products. Processed laser point cloud and images reflected three-dimensional space situation of transmission line corridors, including corridor terrain and object space information.