Experiment results indicate that the proposed metric fits the characteristic of vector map data better and, furthermore, it can achieve more reasonable measuring results than previous methods.
实验结果证明，本文提出的度量方法更符合矢量数据的特点，能够得到比现有方法更准确的度量结果。
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；
Data encryption is a main means to keep data in safety. Concerning the characteristics of vector map data, the paper presents an encryption algorithm based on chaotic sequence.
加密技术是保障数据安全的最主要的手段，结合矢量地图数据的特点，设计了一种基于混沌序列的数据加密算法。
Putting forward the change statistic method based on acreage, and counting the varieties of vector map data by using polygon intersection of vector data and changed pixel of raster data.
提出基于面积的变化统计方法，分别利用矢量数据的多边形交集和栅格数据的变化像素来统计地图矢量数据的变化。
Putting forward the change statistic method based on acreage, and counting the varieties of vector map data by using polygon intersection of vector data and changed pixel of raster data.
提出基于面积的变化统计方法，分别利用矢量数据的多边形交集和栅格数据的变化像素来统计地图矢量数据的变化。
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