But most of topographical map database produced by survey department is only cartographic data, which is vector data structure, but cannot be imported into GIS directly to meet GIS using.
但测绘部门建立的地形图数据库多为单纯的制图数据，虽然与GIS数据一样是矢量结构，却无法直接输入GIS以满足应用需要。
In this paper, several GIS vector data structure models are analyzed and discussed deeply, also their adaptability on PDA are pointed out.
基于掌上电脑，对几种GIS矢量数据组织模型进行了分析和深入讨论，指出了其在掌上电脑上的适应性。
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