面向虚拟地理环境的语义数据模型*

针对当前虚拟地理环境中语义信息表达不足问题，提出了一种面向虚拟地理环境的语义数据模型，能够有效表达几何信息、拓扑信息、语义信息和属性信息，并对这些信息进行关联来表达实体。设计了面向虚拟地理环境的集成空间数据结构，综合表达地上、地表和地下空间实体，通过实体的分类和分解来表达实体的语义信息；依据此语义数据模型，实现了地上建筑物和地形的无缝集成。该语义数据模型能够对虚拟地理环境中的实体进行无歧义表达。

Semantic data model for virtual geographic environment

This paper proposed a semantic data model to solve the absence of semantic information in virtual geographic environment (VGE). Proposed the geographic entity to express the geographic object in VGE, and classified into simple entity and complex entity. Put forward a new 3D semantic data model which included geometry information, topological information, semantic information, and attribute information. Proposed a spatial data structure for VGE, and defined geometry primitives and topology primitives. Based on this semantic data model, could express completely the entities information and integrated seamlessly the buildings and terrain. This semantic data model can unambiguously express the entities in VGE.