滑坡模拟三维地形建模关键技术与应用  

Key technologies and applications of 3D terrain modeling for landslide simulations

作　　者：吕奕杰 叶健 L Yijie;YE Jian(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《测绘通报》2023年第11期7-11,17,共6页Bulletin of Surveying and Mapping

基　　金：国家自然科学基金(41771419);中央高校基本科研业务费专项(A0920502051619-91)。

摘　　要：高精度滑坡地形数据是滑坡模拟准确度和可视化效果的重要保证。针对当前高精度滑坡地形建模渲染全部地形数据导致滑坡模拟程序运行缓慢,分层分块处理地形数据并将地形数据块分批调入内存进行组合渲染导致参与滑坡模拟计算的地形数据不连续且分辨率不统一的问题,本文提出了一种面向滑坡模拟的四叉树LOD地形建模改进方法。将地形数据完整读入内存参与数值计算,在可视化阶段从地形数据中动态构造不同分辨率地形数据块进行组合渲染,为滑坡模拟提供完整连续地形条件,同时保证滑坡地形三维可视化效果,并有效提升模拟程序运行速度,该方法在场景浏览时不会对滑坡模拟的结果产生实际影响。滑坡模拟试验验证了本文方法在滑坡模拟三维地形优化建模方面的有效性和实用性。High-resolution landslide terrain data is an important guarantee for the accuracy and visualization effect of landslide simulations.However,rendering all high-resolution landslide terrain data will cause the landslide simulation program to run slowly,managing terrain data hierarchically and loading terrain data blocks into memory in batches for combined rendering will lead to discontinuity and inconsistent resolution of terrain data participating in landslide simulation calculations.To solve the above problems,an improved quadtree LoD terrain modeling method for landslide simulations is proposed in this paper.Based on this method,terrain data is completely read into memory for numerical calculations,and terrain data blocks of different resolutions are dynamically constructed from the terrain data for combined rendering during the visualization stage,which not only provides complete and continuous terrain conditions for landslide simulations,but also ensures 3D visualization effect of landslide terrain,and effectively improves the running speed of simulation programs.More importantly,by using this method for modeling,the results of landslide simulation will not be affected when browsing the simulation scenes during the landslide simulation processes.The experimental results of landslide simulation show that the method proposed in this paper is effective and practical in 3D terrain optimization modeling for landslide simulations.

关 键 词：滑坡模拟 地形建模 四叉树 层次细节 三维可视化 

分 类 号：P237[天文地球—摄影测量与遥感]