全球空间数据剖分模型分析

随着数字地球发展,全球空间信息多尺度表达和管理使得传统平面格网系统的局限性越来越明显,建立全球数据多尺度剖分模型已成为国内外学者关注的热点。该文介绍并分析全球剖分系统,根据剖分单元的形状和最终投影曲面的性质对球面剖分系统进行分类。总结出球面剖分系统具有连续性、稳定性、层次性和近似均匀性等优点,既有效避免了传统平面格网表达全球数据时存在的数据冗余问题,又克服了不规则球面剖分系统无法进行层次关联的缺陷,在管理全球、多层次和海量的空间数据时具有优势。

Analysis on Global Geodata Partitioning Models

With the developing of Digital Earth,the expression and management of the global multi-scale spatial information make the limitations of traditional planar grid system become more obviously.To establish a new model for the global multi-scale spatial information is a common concern for most domestic and foreign scholars.In this paper,according to the cells' characters and the features of the projection surface of the partitioning systems,the global geodata partitioning system(G2PS) was classified into different types and some virtues of G2PS were pointed out,such as continuity,stability,multi-level,uniformity,and so on.So G2PS may avoid data redundancy effectively and express the levels of the data,which takes advantages over the planar grid system when dealing with the global multi-scale spatial data.