Can utilize the geographical data of foundation in existing GIS database based on single scale, produce mult-scale data synthetically through automatic cartographic generalization.
可以利用已有的基于单一比例尺的GIS数据库中的基础地理数据，通过自动制图综合生成多比例尺数据。
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。
So the purpose of this research is to construct and realize conversion models from cartographic data to GIS database.
本文以模型分析理论为出发点，认为制图数据向GIS数据的转换实质是数据模型的变换。
So the purpose of this research is to construct and realize conversion models from cartographic data to GIS database.
本文以模型分析理论为出发点，认为制图数据向GIS数据的转换实质是数据模型的变换。
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