论述了在数字制图环境下地图输出的特点，在分析了地图上点、线、面符号特征和构造原理的基础上，提出了一种用于数字地图符号化输出的地图符号库数据结构。
On the base of analyzing the character and structure of the point, line, area symbols, a data structure of map symbol base which serves the symbolized output in digital mapping is put forward.
矢量数据符号化是CAC中空间信息可视化的一种主要方法，通常是采用完全基于矢量技术的算法实现。
Vector data is the symbol CAC visual spatial information in a main method, usually using technology based entirely on the vector algorithm.
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