面向实体的三维空间数据模型组织方法及应用

摘要

三维空间数据模型是对现实世界模型化的基础,是空间数据组织的概念和方法,反映了现实世界空间实体及实体间的关系。传统的三维数据模型大多从几何特征表达的角度出发,割裂了空间对象个体之间的逻辑联系,不能完整表达地理实体。本文将地理实体抽象为能独立反映完整空间和逻辑关系的空间对象,提出了面向实体的三维空间数据模型的组织方法。重点探讨了面向对象的三维空间数据模型的描述方法、组织体系、存储方法及其模型库、纹理库的构建方法,并在三维城市供水管网模型建模中进行了应用。%Three-dimensional data model is the basis for the real world modeling.It is also the concept of spatial data organization and methods.It reflect relationships between the real-world spatial entities and entities.Most of the traditional three-dimensional data model express geometric features from the perspective of the space separating the logical connection between the individual objects,which is not the full expression of the geographical entity.In this paper,object-oriented thinking can be abstracted as separate geographical entities which reflects the integrity of the relationship between space and the logical space objects,It is also propose for three-dimensional data model entities,the organizational methods.Focusing on the entity-oriented data model describes the three-dimensional methods,data structures,Organization System and the corresponding three-dimensional model of organization between management of library and texture database,and practicing the application for three-dimensional model of urban water supply networks.