基于连续球面剖分的全球地形数据组织模型

基于正八面体球面剖分的思路,提出了一种对全球地形数据进行组织管理的方法。该方法扩展了QTM的定义,采用了一种新颖的经纬度相关的编码方式,可用于对数据进行快速地检索与调度。同时采用了批量处理的策略,将模型的基本单元从单一三角形变为批量三角形的集合—区块,大大减少了调度过程中CPU负担。并针对区块的数据结构,设计了一种紧密集成的存储方式,减少了系统I/O的代价,便于数据的调度与管理。整体模型结构明确,存储高效,调度方便,能够很好地支持全球范围下地形数据处理与可视化的应用要求。

Global Terrain Data Model Based on Continuous Spherical Grid

An efficient technology was proposed to build the global terrain data model.The proposed method introduced a novel strategy to code and index the global data,which extended the idea of QTM.Instead of the triangle,the block,composed of a few hundreds of triangles,was used as the basic primitive entity in the entire model.And the global data was cache-coherent stored block by block,which was efficient for the users to manage and dispatch.The proposed technique is fully scalable to support the applications of global data analysis or visualization,etc.