在用分层设色表示地貌时，DEM数据分布规律是合理地选择色层和色度的重要参考依据。
The distribution law of DEM data can provide the reference evidence for selecting color layer and chroma to represent landform.
首先对入库的矢量图形数据要求做了概述，如要素的分层设色标准、地形图要素属性项定义等；
Firstly, the request of vector map data is summarized, such as color-setting standard, attribute definition of topographic feature, etc.
首先对入库的矢量图形数据要求做了概述，如要素的分层设色标准、地形图要素属性项定义等；
Firstly, the request of vector map data is summarized, such as color-setting standard, attribute definition of topographic feature, etc.
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