Abstract
Abstract. Based on the characteristics of Unmanned Aerial Vehicle (UAV) system for low altitude aerial photogrammetry and the need of three dimensional (3D)city modeling, a method of fast 3D building modeling using the images from UAV carrying four-combined camera is studied. Firstly, by contrasting and analyzing the mosaic structures of the existing four-combined cameras, a new type of four-combined camera with special design of overlap images is designed, which improves the self-calibration function to achieve the high precision imaging by automatically eliminating the error of machinery deformation and the time lag with every exposure, and further reduce the weight of the imaging system. Secondly, several-angle images including vertical images and oblique images gotten by the UAV system are used for the detail measure of building surfaces and the texture extraction. Finally, two tests that are aerial photography with large scale mapping of 1:1000 and 3D building construction in Shandong University of Science and Technology and aerial photography with large scale mapping of 1:500 and 3D building construction in Henan University of Urban Construction, provide authentication model for construction of 3D building based on combined wide-angle camera images from UAV system. It is demonstrated that the UAV system for low altitude aerial photogrammetry can be used in the construction of 3D building production, and the technology solution in this paper offers a new, fast and technical plan for the 3D expression of the city landscape, fine modeling and visualization.
Highlights
Three-dimensional simulation and virtual reality are two forms of "digital city" and in the building forms both of them are required establishing 3D model
The narrow field angle in these structures leads to aerial photography measurement with low elevation precision, according to report, which accuracy can only meet the requirements with the scale mapping of 1:2000
In order to avoid and eliminate the errors caused by the mechanical deformation and the synchronization exposure time difference, it can only rely on the strong stability of the mechanical structure and the high accuracy of the exposure control circuit (Peng Xiaodong, 2009), so the camera system must be designed with large volume and more than 100kg weight, which is not suitable for the small Unmanned Aerial Vehicle (UAV)
Summary
Three-dimensional simulation and virtual reality are two forms of "digital city" and in the building forms both of them are required establishing 3D model. Because of the limitation of flying high, photography posture and timeliness, fixed orbit satellite remote sensing and manned aerial photography in middle and high altitude can only get the information of the height and top textures of some buildings, which are hard to meet the requirement of 3D data rapid access and update for city building (Wu Jun, 2003; Li Chengming, 2008). Every part of survering area can be photography with more than four images by the UAV system with combined wide-angle camera, including vertical images and oblique images, which can effectively avoid the influence of the dodging from each building to meet the requirements of 3D data for city building. Based on the characteristics of UAV system for low altitude aerial photogrammetry, a method of fast 3D building modeling using the images from UAV carrying four-combined camera is researched. Two tests are done which show the proposed method feasible
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