The map is a carrier of visualization for geographical information, and map symbol is main expression of map data.

地图是地理信息可视化的载体之一，而地图符号是表达地图内容的主要形式。

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Finally, it describes the course of visualization in the geographical information systems.

最后针对地理信息系统中的可视化过程进行了描述。

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With the application of Digital Map and Geographical Information System and progress of Computer Visualization, Screen Map is developed.

屏幕地图是随着数字地图和地理信息系统技术的应用、计算机可视化研究的深入而产生的。

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