全球六边形离散格网数据的三维可视化方法  

The 3D Visualization Method of Hexagonal Discrete Global Grid Data

作　　者：童晓冲[1,2] 贲进[2] 张永生[2] 汪滢[2] 

机构地区：[1]北京师范大学地表过程与资源生态国家重点实验室,北京100875 [2]信息工程大学地理空间信息学院,河南郑州450052

出　　处：《测绘学报》2013年第3期374-382,403,共10页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41201392;41271391);国家自然科学基金重点项目(40930104);国家863计划(2009AA12Z218)

摘　　要：针对全球六边形离散格网的三维显示化方法开展研究,设计了一种六边形格网的空间层次结构(hexagonalquaternary balanced structure,HQBS),采用四位码元对格网单元进行编码,定义并实现了格网向量的基本运算,利用这些运算可以方便地实现格网单元的空间索引。在此基础上还研究了全球离散格网的动态生成与显示算法、可视化区域裁剪等相关内容。试验表明:全球格网动态生成的效率110～370单元/ms之间,加载空间数据后,格网数据和空间数据逐层加载的时间在300 ms左右,能够保证加载空间数据后的显示刷新率在20帧/s左右。Aiming at the 3D visualization method of hexagonal discrete global grid, a new spatial operation structure （hexagonal quaternary balanced structure, HQBS） for hexagonal discrete grid, was designed. It used 4 codes to encodes units, defined spatial vectors for grids and realized basic operations. Based on the operations, spatial index can be easily solved. And dynamic generation algorithms, spatial visualization methods and clipping of visi- ble area of global grid were studied. Through visualization experiments, conclusions were obtained as follows. The average generation efficiency of global dynamic grid could reach 110 units per ms to 370 units per ms, and the loading time efficiency of grid data and spatial data per layer was about 300 ms. The average refreshing level of global discrete grid loaded with spatial data was about 20 frames per second, which ensured real-time displaying requirements.

关 键 词：全球离散格网系统 六边形 三维可视化 可视区裁剪 

分 类 号：P228[天文地球—大地测量学与测量工程]