面向大规模滑坡灾害模拟的地形建模与三维可视化

A Large-Scale Landslide Hazard Simulation-Oriented 3D Terrain Modeling and Rendering Approach

针对大规模滑坡灾害模拟时滑坡模拟计算和大规模地形渲染导致内存消耗大、难以实现大规模滑坡地形数据渲染的问题,提出了一种四叉树多分辨率地形渲染方法。考虑到大规模滑坡地形数据的海量性,分层分块组织地形数据,构建地形块线性四叉树索引;并结合提出的地形节点查找方法动态查找和调度地形数据,建立节点细分评价体系和地形接边算法,提出了四叉树多分辨率地形渲染优化算法。实验结果表明,利用所提出的大规模滑坡地形渲染算法,合理调度三维场景数据,满足了大规模滑坡地形数据渲染要求,也实现了大规模地形高保真度表达,为大规模滑坡模拟奠定基础。

A quadtree-based multi-resolution terrain rendering method is hereby proposed for the great memory consumption and difficult realization of the large-scale landslide terrain data rendering in the case of any large-scale landslide terrain rendering.Considering the massive data of large-scale landslide terrain,it is required to manage terrain data hierarchically,construct a linear terrain block quadtree index,search and dispatch terrain data by the proposed terrain block node search method,establish a terrain block node subdivision evaluation system and a terrain edge matching algorithm and bring forward the quadtree-based multi-resolution terrain rendering algorithm accordingly.The experimental results show that the large-scale landslide terrain rendering method is used to guarantee the large-scale landslide terrain data rendering requirements,realize the high fidelity expression of large-scale terrain and lay a foundation for the simulation of large-scale landslide by means of reasonably dispatching 3 D scene data.