| In recent years,with the development of UAV technology,with its low cost,low control difficulty,unconstrained takeoff ground and stable flight performance,UAV has been more and more obscured by the surveying and mapping industry,and has been widely used in the service industry,agriculture and forestry,electricity,land and urban planning,especially.It has obvious advantages in rapidly obtaining high resolution images in difficult flight areas.Compared with the traditional 3D modeling method,the UAV has many advantages,but the development of UAV is limited to a certain extent because of its small size,weak carrying capacity and short endurance time.Usually,the five-lens camera is used in the threedimensional reconstruction of UAV tilt photogrammetry.However,if the image can be collected by a more portable camera and the accuracy can meet the requirements,it will undoubtedly increase the access to the three-dimensional reconstruction of the image.In this paper,according to the needs of three-dimensional image reconstruction and the characteristics of multi-rotor UAVs,the low-altitude aerial camera hardware selection,image acquisition process optimization and aerial photography image data accuracy analysis are compared in several aspects.The key technologies are systematically analyzed and researched and successfully applied to practical work.The main research contents and research results are as follows:1)A key workflow for image acquisition using a single-lens camera is proposed,including route planning and aerial quality control;2)Introduced the main methods of 3D modeling and discussed the specific process of 3D modeling of the experimental area based on Smart3 D software;3)Accuracy analysis was performed on the measurement results of the 3D model under a single lens.The ground control point and the relative distance between the corner coordinates of the house and the corner points were compared with the field total station measured data to verify whether the accuracy of the method reached the digital measurement. |
