Map symbols which represent the spatial information is the language of mapunits, also is the content of visual expression of the basic tools of geographic information.
地图符号是地图表达空间信息的语言单位,是可视化表达地理信息内容的基础工具。
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SOTER Project utilizes information technology to develop a world soil and terrain database, containing digitized mapunits and attribute data in a rational database management system.