Modeling Methods and Basic Problems of Discrete Global Grids
Li Ying · Geography and Geo-Information Science · 2012
The model of Global Discrete Grid(GDG) is the base of Digital Earth and Spatial Information Grid.Difference modeling methods have affected not only the storage and management efficiency of spatial data,but also the operational function of Global GIS as.Firstly,the appraised criterion of Global Discrete Grid is introduced in this paper.Then,the international research results on GDG are summarized and appraised by three kinds,such as longitude/latitude grid model,adaptive grid model,and polyhedron grid model.Next,the geometric structures,unit characters,and application modes of the different kinds of GDGs are analyzed contrastively.In the end,some basic problems,including coding,precision,application,error,integration and location,on GDG modeling in Global GIS are presented.