图形系统可对地图进行各种操作，完成数据显示、数据查询分析、地震辅助决策等。
Graphic system can realize data visualization, data query, assistant decision during earthquake by kinds of operation to the map.
拓扑处理是数据查询与分析的前提，矢量数据压缩则有利于节省存贮空间和提高数据处理速度，文中也讨论了电子地图制作系统中所采用的拓扑及数据压缩方法。
The topology processing is the prediction of the data searching and analysis, and the vector map data compressing is good for economizing memory space and speeding up the data processing.
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