通用地图符号表达机制的研究

地理信息共享是地理信息系统（GIS）研究中的一大热点，其中地图符号的共享尤为重要。针对目前地图符号共享所面临的主要障碍，文中从地图符号的定义出发，利用图元参数法建立通用地图符号表达模型，并采用XML语言完成符号的描述，最后通过符号配置，生成由通用几何图形组成的符号化结果，从而实现地图符号的共享。在vc＋＋环境下开发通用地图符号化组件和符号制作软件，通过实例符号的制作和应用，验证该地图符号表达机制的可行性和通用性，符号化效果理想。

A study of general portrayal mechanism of map symbol

h is a hot issue that aims to achieve the geographic information sharing on the study of Geographic Information System （GIS）, and the map symbol sharing is a very important part of it. Focused on the primary difficulties on the map symbol sharing and based on the definition of map symbols, a general portrayal model is given by using Unit-Parameter method and by XML. Finally the sharing of map symbols is achieved by sharing the symbolis which is composed of general geometric figures after symbolizing. In order to verify the feasibility and the commonality of this mechanism, the general map symbolized component and symbol producing software in VC＋ ＋ environment are developed, which show the acceptable efficiency.