一种面向对象的多基元三维GIS模型

An Object-oriented Multi-primitive 3D GIS Model

三维对象的不连续性、复杂性和不确定性降低了三维模型的普适性,针对三维模型难以适应更复杂三维对象问题,本文提出了一种面向对象的多基元三维GIS模型,该模型定义结点、弧、多边形、区域、组分面和组分体六种基元,通过对其基元及拓扑关系描述,实现了数据结构设计。理论分析表明,该模型描述拓扑关系不存在歧义,可以妥善减少数据编辑引起的数据冗余,尤其适宜于数据频繁更新,提高三维模型的普适性。

The discontinuity,complexity and uncertainty of three-dimensional objects reduce the universality of three-dimensional models.Aiming at the problem that three-dimensional models are difficult to adapt to more complex three-dimensional objects,this paper proposes an object-oriented multi-primitive 3D GIS model,which defined six primitives: node, arc, polygon, region, component face and component.Through describing their primitives and topological relationship,the data design of the model is realized.The theoretical analysis showed that there is no ambiguity in describing the topological relationship of the model,which could properly reduce the data redundancy caused by data editing,especially suitable for frequent updating of data, and improve the universality of the 3D model.