Efficiently compressing vector map data is the basic requirement of an embedded GIS.
满足功能并对矢量地图数据进行高效压缩，是嵌入式GIS系统的基本要求。
Putting forward the change detection flow of areal ground features based on vector map data.
提出基于地图矢量数据面状地物变化检测的流程。
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；
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