面向地理信息系统的三维空间数据模型

通过分析三维ＧＩＳ空间数据模型的基本概念、研究进展及所存在的问题，在三维空间实体的形式化定义及空间实体间拓扑关系形式化描述等研究基础上，建立了顾及空间剖分的三维拓扑数据模型。该模型不但可以有效地表达规则形状的空间实体，还可以有效地表达不规则形状的空间实体。它兼顾了基于镶嵌的数据模型和基于矢量的数据模型两种表示方法的优点，为发展三维ＧＩＳ软件提供了一些有益的设想和方法，可以使得系统在数据组织、数据管理、图形恢复上避免不必要的麻烦，并可望使空间查询和空间分析具有高效性

3D Spatial Data Modelling for Geographic Information System

The present research activities take care of the development of 3D GIS and within the research work of them the key problem is to constract 3D data model.This paper focused on the research of topological model based on space partition for 3D GIS.By review the history of 3D data model,the formal definition and geometric structure of 3D spatial objects are given.According the entity and relation beween 3D objects and k simplex,the E-R diagram can be presented and the topological data model is obtained from them.This model is a hybrid data model.It is well suited for the representation of regular shapes objects and irregular shapes objects.It is not only account for topology and thematic properties but also facilitate interpolation.So it is the primise for data organization,spatial database design,spatial reasoning effectively.