3维GIS面向对象数据模型的研究与应用

A Study of Three-dimensional GIS Object-Oriented Data Model and Its Application

3维数据模型是 3维GIS研究中亟待解决的一个核心问题。在充分分析现有 3维数据模型的基础上 ,从实际应用出发 ,针对传统模型的不足 ,提出 1种 3维GIS面向对象数据模型 ,以解决空间不规则实体本身 ,以及实体间复杂关系的描述、表达和组织等关键问题 ,并给出此模型应用实例 。

With the development of GIS, many fields, such as geology, mine, subterranean hydrology, etc., realized that real three dimensional GIS (3D GIS) are urgently needed. Among the problems encountered in the development of 3D GIS, 3D data model is the most difficulty one. Presently, there are some 3D data models, namely, wireframe representation, boundary representation, cell decomposition, construction expression, tetrahedral network, octree, TIN, to name but a few. Although these models are efficient in special application environments, all of them can not describe the complex three dimensional entities respectively. Thus, someone created some omnibus 3D data models, but for these models still exist shortcoming in the scope of applications. It is put forward a 3D GIS Object Oriented (OO) data model based on the OO technology and practical application. This model can not only describe anomalous 3D entities themselves and the complex contact situation among them, but also organize 3D data effectively. The model has been applied to the establishment of China Global Geoscience Transects (GGT) GIS, which may be the first GIS for lithosphere study. An example is given to illustrate the feasibility and effectiveness of this 3D data model.