顾及地面POS信息的空地一体城市三维实景重建

实景三维模型为数字孪生提供了统一的数字空间底座。在城市场景中，贴近地面及在空中视角下被遮挡的地物是实景三维重建的难点。针对城市复杂空间环境和无人机飞行局限的问题，本文基于倾斜摄影与空地一体融合建模的基础理论，考虑POS信息对空地一体空三融合的影响，提出了一种顾及地面POS信息的城市实景三维重建方法，并使用此方法对佛山市历史文化街区进行了精细化建模。试验表明，与常规方法相比，该方法的模型效果好、效率高，对实景三维产品的生产与空间数据多尺度表达具有重要意义，可为数字孪生应用提供更精细的地理场景表现形式。

A real city 3D reconstruction method considering air-ground POS information

Real 3D models provide a unified digital spatial base for the digital twin. In urban scenes, the parts that are obscured close to the ground as well as in the aerial view are difficult areas for 3D reconstruction. In view of the complex spatial environment of the city and the limited capability of UAV operations, This paper proposes an air-ground integrated real 3D reconstruction method that takes into account ground position and orientation system (POS) information based on the basic theory of tilt photography and air-ground integrated modelling, and is fine-grained modeled of the historical and cultural district of Foshan city based on this method. The experiments show that compared with conventional methods, the modelling of this method has the advantages of good effect and high efficiency, which is important for the production of real 3D products and multi-scale representation of spatial data, and can provide a better representation of geographical scenes for digital twin applications.