【摘要】 如何用计算机的1维存储空间存放由0维、1维、2维、3维等空间目标的集合所定义的形体,是几何造型中最基本的问题。文中针对传统地图符号表现方法的局限性,分析了国内外3维地图符号的研究现状,针对3维地图符号设计的特点和要求采用参数函数和边界数据模型作为建立3维地图符号的数据结构。更多还原

【Abstract】 The basic problem in the geometry modeling is how to use 1D storage space of computer to store the forms defined by the aggregation of space objects, such as 0D,1ID or 2D and 3D. In accordance with the limitation of performance of traditional map symbols, this paper analyzes the present research condition of 3D map symbols at home and abroad. In the light of the feature and requirements of 3D map symbols designs, two major kinds of expression of models are employed to establish the data structure of them.更多还原