摘要
从全球离散网格系统的应用需求出发,分析全球框架下建立局部网格的重要性,在此基础上提出全球离散网格系统下同构化的局部网格生成的基本思路,详细分析局部网格的复杂球面边界问题,从点与球面三角形的位置关系入手,讨论点与任意球面多边形的相对位置关系,研究基于球面任意多边形的边缘简化算法、判断点与球面任意多边形相互关系的算法、考虑跨面问题的网格区域裁减以及网格数据的层次生成算法。通过实验证明这些方法的效率和准确性。
Firstly, the paper analyzed the essentiality of generating partial grids based on the application and requirement of discrete global grid systems. And then, we brought forward the fundermental thought of generating partial grid which is under the discrete global grid frame, and discussed the detailed edge problems of partial high- precision grid. Started with the ubiety between a point and a spherical triangle, we discussed theubietybetweena point and a spherical random polygon, and then edge simplifying algorithm of spherical random polygon ore studied, as well as co-relationship between points and spherical random polygon, grid district clipping based on spanning the developed surface andgrid data hierarchical creating algorithm. In the end we prove exactness and efficiency of the algorithm through the experiments.
出处
《测绘学报》
EI
CSCD
北大核心
2009年第6期506-513,共8页
Acta Geodaetica et Cartographica Sinica
基金
国家863计划(2009AA12Z218)
国家自然科学基金(40671163)
信息工程大学博士基金
关键词
全球离散网格系统
局部网格
区域裁减
层次数据
discrete global grid systems
partial grid
district clipping
hierarchical data
