基于金字塔模型的地形网格数据研究

地理空间情报在情报分析与作战指挥中发挥了越来越重要的作用,它包括一体化的影像、地理空间信息,而地形是地理空间信息中的重要因素。为了实时地绘制大规模地形数据,在继承传统算法基础上,借鉴遥感影像金字塔模型,将遥感影像和地理信息统一,提出了一种瓦片金字塔模型和线性四叉树索引相结合的地形数据结构,并采用一种新的基于瓦片四叉树的接边处理方法用于消除不同层次之间的裂缝,是对传统结构的优化。实验结果表明该方法在保持地形逼真的前提下,在PC机上运行时有很好的绘制网格帧率和实时动态交互效果。

Terrain Grid Dataset Research Based on Pyramid Structure

In intelligence analysis and command of wars,GeoINT plays a more and more important role,which contains remote sensing image and geographical information.In order to render massive terrain data in real-time,this paper puts forward a kind of data structure based on tile-pyramid model and linear QuadTree tile-index.And a new neighbor-processing method according to tile QuadTree is discussed to cancel the cracks between different layers.The experiment results show that with the improved method real-time rendering of massive terrain dataset is shown vividly,and this system can run well in PC with satisfied speed and quality to generate graphic.