倾斜航空影像的城市建筑物三维模型构建研究

针对当前城市建筑物三维模型构建的需要,本文提出一套利用无人飞艇载四组合特宽角相机同时实现高精度空中三角测量和建筑物景观三维建模的技术路线。一方面通过基于四相机重叠影像自动匹配的自检校,达到设备轻小型化条件下的精密等效中心投影构像,用以支持高精度空中三角测量;另一方面,通过自检校的4个方向倾斜的相机,达到一次飞行同时获得四方向建筑物侧面影像的目的,为城市景观的三维表达、精细建模和可视化提供一种新的、快捷的技术方案。

Research on construction of 3D building based on oblique images from UAV

Due to the limit of flight height and aerial photography’s pose(vertical or small angle photography),satellite remote sensing with fixed orbit,median altitude aerial photogrammetry and fixed-wing UAV(Unmanned Aerial Vehicle) only can acquire part of height information and roof texture information of building.Aiming at acquiring three dimensional information of buildings quickly to meet the demands of current three dimensional digital city,a low-altitude UAV-airship photogrammetry system that takes low-altitude UAV-airship as flying platform carrying wide-angle and combined camera was designed to support high precision aerial triangulation and three dimensional city buildings construction.On the one hand,self-calibration based on auto-matching of four cameras overlap images formed a precision equivalent project image for aerial triangulation,on the other hand,building profile images could be acquired at one flight from four oblique cameras.