Abstract: In order to effectively organize and manage massive spatial data, a set of multi-level geospatial framework is designed , namely global subdivision model based on extended mapping division (EMD), which sets spatial data organization and spatial object expression in a whole integration based on the integration of advantages of various global subdivision model in the world. EMD framework is mathematically defined on the basis of specifying the construction and encoding methods of EMD model. And the geometric properties and geometric accuracy are analyzed in details so that the application field and range of EMD model are determined. Finally, the experiment of spatial object expression is finished by means of GeoID coding, and the superiority of this geospatial grid framework is validated as the expression framework of spatial objects.

Key words: geospatial grid framework, geometric properties, spatial data organization, GeoID coding

摘要： 为有效组织与管理海量空间数据, 在融合国内外各种球面剖分模型优点基础上, 设计了一套集空间数据组织与空间对象表达于一体的多层级地理空间剖分框架??基于地图分幅拓展的全球剖分模型(EMD模型)。在明确EMD模型的构建方法与编码方法基础上, 对EMD框架方案进行了数学定义, 并具体分析了其几何性质与几何精度, 以确定EMD模型的应用领域与应用范围。最后利用GeoID编码完成空间对象表达实验, 验证了该地理空间网格框架作为空间对象表达框架的优越性。

关键词: 地理空间网格框架, 几何性质, 空间数据组织, GeoID编码