基于透视投影原理的瓦片LOD算法的研究与实现  

Research and Implementation of Tile LOD Algorithm based on Principle of Perspective Projection

作　　者：刘永杰[1] 

机构地区：[1]北京大学遥感与地理信息系统研究所,北京100871

出　　处：《林业调查规划》2014年第5期1-6,共6页Forest Inventory and Planning

摘　　要：针对目前大规模三维地形虚拟场景的实时切换和漫游需求,阐述LOD算法的技术原理、关键技术点、主要指标,分析业界流行的开源引擎NASA WorldWind三维地球软件的瓦片LOD算法,提出了一个基于透视投影原理的三维地球瓦片LOD优化数学模型。基于这个数学模型,针对特定场景提出了优化方案。实验证明,此方案能明显提高三维地球分级瓦片的调度性能,解决网络环境下三维场景快速展示的需求。Aiming at the scene needs of large-scale three-dimensional virtual real-time switching and roaming,the main research on LOD algorithm technical principles,key technologies and main indicators have been elaborated,and tile LOD algorithms of the industry’s popular open-source engine NASA WorldWind software about 3D Earth also been analyzed. Therefore,an optimized LOD mathematical model of three-dimensional earth tiles has been put forward based on the principle of perspective projection. This mathematical model can propose optimization scheme for specific scene. This scheme can significantly improve 3D Earth grading tile scheduling performance,and fulfill the needs of quickly showing three-dimensional scene in the network environment.

关 键 词：LOD技术 WorldWind算法 三维地球 瓦片分级 透视投影原理 

分 类 号：S75[农业科学—森林经理学] P23[农业科学—林学]