The simple data structure of vector model is introduced using the ORACLE SPATIAL as an example.
在该部分，以ORACLE SPATIAL为例，讨论了矢量数据模型的简单数据结构；
This paper analyzed the spatial characteristics of tree-like river networks, and built vector model based on graph theory.
以树状河系为研究对象，分析其空间特征，建立基于图论的水系网矢量模型。
The experiments showed that the model can work efficiently and practically, and keep the topological insistency of the vector spatial data.
实验表明，该模型不仅可行，而且高效，并保持了空间要素和要素之间的几何拓扑一致性。
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