以Feature元素为单元的GML文档扩展区域编码ER-Code  

ER-Code:Extended region code based on Feature of GML documents

作　　者：张海涛[1] 杜国庆[2] 闾国年[3] 张书亮[3] 

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003 [2]江苏省测绘局,南京210013 [3]南京师范大学地理信息科学江苏省重点实验室,南京210097

出　　处：《计算机应用》2008年第8期2121-2124,共4页journal of Computer Applications

基　　金：国家自然科学基金资助项目(040401045);南京邮电大学攀登计划项目(NY206074);虚拟地理环境教育部重点实验室开放基金资助项目(NS206001);江苏省测绘科研项目(JSCHKY200707)

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。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.

关 键 词：GML路径查询 预留编码空间 整体空间 

分 类 号：TP311.12[自动化与计算机技术—计算机软件与理论]