基于倾斜摄影的城市洪涝过程三维可视化展示方法

3D visualization method of urban flood simulation based on tilt photogrammetry

针对城市洪涝过程数值模拟计算结果对数据精度的高度敏感性问题,以及满足城市洪涝过程高逼真度展示的需要,本文将倾斜摄影测量获取的高精度测绘地理数据用于城市洪涝过程数值模拟计算,以获取的高精度计算结果和倾斜摄影实景三维建模等数据为支撑,提出基于倾斜摄影的城市洪涝过程三维可视化展示方法。首先设计基于倾斜摄影的城市洪涝过程三维动态可视化技术流程框架,然后重点研究倾斜摄影实景三维建模与三维地理空间场景构建、洪涝淹没数据与DEM数据整合等关键技术,最后定制开发洪涝过程三维可视化展示系统Flood-3DGIS,通过实例对城市洪涝过程进行了三维实景动态仿真可视化展示,结果实用、可靠。文章成果可有效提升城市洪涝可视化认知水平,其作为城市防洪减灾非工程措施的重要技术支撑,具有良好实际应用价值。

In view of the high sensitivity of numerical simulation results of urban flood process to data accuracy,and to meet the needs of high fidelity display of urban flood process,this paper uses the high-precision surveying and mapping geographic data obtained by tilt photogrammetry to numerical simulation model of urban flood process.Based on high-precision numerical simulation data sets and 3D modeling data of tilt photogrammetry,this paper puts forward a 3D visualization method of urban flood process based on tilt photogrammetry.Firstly,the technological process framework of urban flood process’s 3D dynamic visualization based on tilt photogrammetry is designed.Then,the key technologies such as 3D modeling and 3D geospatial scene construction,and integration of numerical simulation data sets and DEM data are mainly discussed.Finally,a 3D visualization display system called Flood-3DGIS for urban flood process’s display is developed.The examples of urban flood process’s 3D real scene dynamic visualization shows that the results are practical and reliable.The method in this paper can effectively improve the cognitive level of urban flood process,and can provide an important technical support for non engineering measures of urban flood management and disaster reduction,which is of good practical application value.