基于地图方里网的全球剖分系统  

Global Subdivision Systems Based on Map Kilo-Grids

作　　者：耿晓晖[1] 程承旗[1] 宋树华[1] 李大鹏[1] 

机构地区：[1]北京大学遥感与地理信息系统研究所,北京100871

出　　处：《地理与地理信息科学》2010年第2期15-18,共4页Geography and Geo-Information Science

基　　金：国家重点基础研究发展规划(973)项目(61399)

摘　　要：针对现有剖分模型的不足,提出了一种基于地图方里网的全球剖分系统,有效避免了传统经纬度格网模型在高纬度地区的形状退化和正多面体格网模型的面片形状不规则问题。制定了相应的编码,实现了面片编码与传统地理坐标之间的转换和邻接关系的计算,最后对方里网在地球椭球面上的变形规律进行了研究。研究结果表明:基于地图方里网的剖分系统不仅具有科学的数据组织形式,而且面片单元的变形面积小、变形规律稳定。Kilo-grid is the grid formed by the evenly spaced parallels of the projection coordinate axes. Re-projecting the kilogrids onto the earth ellipsoid results in the subdivision of the earth ellipsoid,and this avoids the shape degeneration of the traditional geographic grid model in the high-latitudes and the irregularity problem of the meshes of the polyhedral-based discrete grid models effectively. Based on the quad-tree structure between the grids of different levels,the according mesh code is established on the basis of Morton Code and the transformation between traditional geographic coordinates and the mesh codes and the calculation method of the adjacency relationship of meshes are implemented. In the end, related research is done on the dis- tortion rules of Kilo-grids on the earth ellipsoidal surface. The results indicate that though there exists area distortion when projecting the meshes to the ellipsoidal surface, the distortion is minor and follows strict rules, which makes the Kilo-grid Model suitable as a basic Global Subdivision Model.

关 键 词：全球剖分系统 方里网 高斯克吕格投影 Morton码 

分 类 号：P208[天文地球—地图制图学与地理信息工程]