海量地形数据的管理和交互策略优化  

Optimized management and interactive strategy for massive terrain data

作　　者：殷小静[1] 慕晓冬[2] 徐义文[1] 陈琦[1] 

机构地区：[1]第二炮兵工程学院研究生管理大队,西安710025 [2]第二炮兵工程学院指挥自动化系,西安710025

出　　处：《计算机应用》2011年第9期2465-2467,共3页journal of Computer Applications

摘　　要：针对海量地形绘制中有限的计算机内存与海量地形数据之间的矛盾,对海量地形数据采用瓦片金字塔模型进行了建模,分析了瓦片最优值的选取,根据四叉树瓦片拓扑关系提出一种高效的四叉树瓦片检索方式,并给出了基于瓦片的数据压缩思路与方法。对海量地形数据与三维显示的交互策略从数据预装载、双缓存机制、多线程技术、内存优化等方面进行了分析和优化,并结合经典的Geometry Clipmaps算法进行了地形绘制,实验结果具有较好的渲染效果和较高的实时性,证明了优化策略的可行性和有效性。Concerning the contradiction of the limited computer memory and the huge terrain data in terrain rendering, the tile-pyramid model was built up and the optimum size of the tile was analyzed. An efficient method of quadtree tile-index according to the relation of quardtree tiles and a thought of data compress based on ＂tile＂ were also put forward. The method not only analyzed but also optimized the interactive strategy between the massive terrain data and the three-dimensional display from the data pre-loaded, double-caching mechanism, multi-thread and memory. In combination with classic Geometry Clipmaps algorithm, the terrain rendering was accomplished. The experimental results show excellent rendering effect and good real-time performance, and prove the feasibility and efficiency of the optimized strategy.

关 键 词：海量地形 瓦片金字塔模型 四叉树瓦片索引 预装载 多线程 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]