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。
Finally, according to the definition of difference, this article judges the imperceptibility of watermark algorithm for the GIS vector data through the operation of spatial analysis.
最后，本文从差异性定义出发，通过空间分析操作，判断面向G IS矢量数据水印系统的不可感知性。
QGIS handles all three — raster, vector, and database — a state of affairs that took considerable effort for programmers writing GIS data programming libraries.
QGIS处理所有三种数据——栅格数据、矢量数据和数据库，这也是编写GIS数据编程库的程序员的重要努力方向。
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