...据描述的基本格式包括显式描述的栅格数据结构（Raster Data Structures，RDS）和隐式描述的矢量数据结构（Vector Data Structures，VDS）。
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With the vector data structure created, we study a lot of spatial analyze arithmetic, such as the shortest path arithmetic.
同时，根据所建立的矢量数据结构，我们研究了一些空间分析算法，如最短路径算法等。
After some experiments and programming done, an adaptable and completable vector data structure model based on PDA is reached.
通过实验研究与编程实现，得出了一种在掌上电脑上具有较好的完备性和适应性的矢量数据组织模型。
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。
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