面向数字地球的地理信息系统的设计与实现

Design and implementation of an object-digital earth GIS

数字地球作为一个战略目标在我国已被广泛接受 ,与此相关的数字中国、数字省、数字城市等工程正在全国如火如荼地展开 .什么样的系统适应于构造数字地球、数字中国、数字省、数字城市的基础平台呢 ?从数字地球的基本构成。

One basic idea of digital earth is to cover the surface with high_resolution remote sensing images, and by means of digital elevation model(DEM) covering the world, to establish the virtual landscape of the earth. In the establishment of these models, the integrated management of image data, DEM and vector data are in great demand. The commercial geographic information system(GIS) software packages can handle the large spatial database with vector data format. However, most of them are not efficient enough to manage image database and DEM database. Therefore, it is necessary to develop a spatial database management system that can integrate various data.\;This paper brings forward a vector, image and DEM integrated spatial data model on the basis of the object_oriented idea. It also discusses the implementation method of this integrated spatial database management system. The spatial database management system has been used in the construction of China Spatial Data Infrastructure as the base of a GIS software, GeoStar. It reveals that the system has high efficiency and feasibility to manage national, provincial and city spatial data of multi_scales and multi_sources.