倾斜摄影三维模型与大场景地形的融合算法

Research on the fusion method of 3D models of oblique photography and large scene terrain

针对现有的数据融合算法不能解决倾斜摄影的三维模型与大场景地形相互融合的问题,提出了一种基于外部缓冲区和TIN瓦片金字塔的数据融合新算法。采用在倾斜摄影地形外部建立过渡缓冲区的方法,解决了倾斜摄影地形和大场景地形的平滑过渡问题,这种方法还保证了倾斜摄影地形的精度。在过渡缓冲区内采样时构造了多条缓冲带,这种采样方法实现了采样密度从倾斜摄影地形到大场景地形的逐渐过渡;通过建立TIN瓦片金字塔实现了对多分辨率数据调度和纹理贴图的支持。实验结果表明,这种方法把倾斜摄影的三维模型与大场景地形很好地融合在一起,并且融合后的数据可以在三维地理信息系统中流畅地调度。

Since existing data fusion algorithms can not fuse together the 3D models generated from oblique photography and the large scene terrain, this paper proposes a new data fusion algorithm based on external buffer and TIN tile Pyramid. In order to achieve smooth transition of the oblique photography ter- rain and the large scene terrain, a method of constructing transition buffer outside the oblique photogra- phy terrain is proposed and the accuracy of the oblique photography terrain is preserved. In order to achieve gradual transition of the sampling density from the oblique photography terrain to the large scene terrain, multiple buffer strips are constructed in the transition buffer during sampling. TIN tile Pyramid is con- structed in order to support multi resolution data loading and texture mapping. Experimental results show that the 3D models generated from oblique photography and the large scene terrain are well fused and that the fused data can be smoothly loaded in 3D geographic information system.