Journal of Computer Applications

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Extended Region Code based on Feature of GML Documents: ER-Code

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  • Received:2008-03-10 Revised:2008-04-14 Online:2008-08-01 Published:2008-08-01
  • Contact: ZHANG Hai-Tao 张海涛

以Feature元素为单元的GML文档扩展区域编码ER-Code

张海涛 杜国庆 闾国年 张书亮   

  1. 南京邮电大学 江苏省测绘局 南京师范大学 南京师范大学
  • 通讯作者: 张海涛

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Abstract: Demanding on simultaneously carrying out the relations judgment of features′ elements containment as well as features′ geometry topotaxy in processing of GML path query, Tap the traditional XML path encode techniques analyzing, the paper designed an extended region code: ER-Code which takes the feature element as the unit of GML documents. Experimental results show that ERCode has good performances on initial construct and holistic query based on ER-Code. In addition, integrating ER-Code and the feature spatial geometry characteristic to an overall space can improve the efficiency that GML data path query greatly. This coding method has certain theory and practical value to the research of GML relevance technologies such as spatial data querying and storing.

Key words: GML Path Query, Reserving-space, Extended Region Code, Holistic Space

摘要： 根据GML数据路径查询中同时进行Feature元素包含关系以及Feature几何特性拓扑关系判断的需要，在研究传统XML路径编码方法的基础上，设计一种以Feature元素为单元的GML文档扩展区域编码：ER-Code。实验证明：ER-Code在编码初始构造、基于编码的整体查询等方面均具有较好的性能，把ER-Code与Feature的空间几何特性融合为一个整体空间，可大大提高GML数据路径查询的效率；该编码方法对于GML空间数据的存储、查询等相关技术的研究具有一定的理论与实用价值。

关键词: GML路径查询, 预留编码空间, 扩展区域编码, 整体空间

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