基于表面剖分的3DCM空间数据模型研究

３维城市模型（３ＤＣＭ）的研究近年来得到了飞速发展，但目前所开发的３ＤＣＭ系统大多属于３维可视化系统，所提供的空间分析与操作功能极为有限，究其原因，主要是缺乏能有效表达城市３维实体及其空间关系的３ＤＣＭ空间数据模型。尽管在３ＤＧＩＳ数据模型的研究方面，许多学者提出了很有价值的模型，但这些模型均难以灌足城市３维建模的要求。针对这一问题，本文首先分析了城市３维实体的几何特征及３ＤＣＭ系统要求，提出用外

A 3DCM Data Model Based on Surface Partition

The research about 3DCM is in full swing, and also got a rapid progress in recent years. But the majority of the 3DCM systems are only 3D visualizing systems, which have few functions to provide operation and analysis, and it's also difficult to represent complex 3D objects. The main reason is that its spatial data model can't represent 3D objects and spatial relationships between them efficiently. As traditional 3D GIS data model seldom considers the idiographic feature of 3D objects and 3DCM system itself, the present 3D GIS data model can't be used in 3DCM, so it's need to establish a data model especially for 3DCM. Because the representation of Face objects and Body object is the key problem, this paper introduces to settle this problem by TIN partition representation to these objects surface, and from this main view point, a 3DCM data model based on Surface Partition is put forward. In addition, we explored an experiment system and construct many 3D entities, with these entities we illustrate the data model in detail.