The technique of UAV-based airborne laser scanning data preliminary processing

The technique of UAV-based airborne laser scanning data preliminary processing is proposed. Its main steps, such as filtering the data, determining the calibration parameters of the survey system, strip adjustment of trajectories and point clouds are described and analyzed. The high density of a point cloud, which is the basic feature of the measurements made at low altitude, is taken into account. The study of the technique was carried out on the example of urban area data obtained with the laser scanner AGM-MS3. This information served to develop filtering and relative orientation algorithms. The initial data AGM-MS3 were also analyzed for the need to adjust them when the distance between adjacent strips is short. It is concluded that the technique can be used to process data on any territory.