分布式空间数据源的联合查询  

Integrated query of distributed spatial data sources

作　　者：王颖[1] 

机构地区：[1]燕山大学信息科学与工程学院计算机系,河北秦皇岛066004

出　　处：《计算机工程与设计》2007年第4期770-772,共3页Computer Engineering and Design

摘　　要：根据空间数据源的特点给出一种表示空间数据源能力信息的方法,包括导出模式、查询能力和转换能力。在此基础上查询计算引擎针对用户查询集成多个分布式空间数据源的能力,通过构造模式图和函数图为用户查询构造相应的查询转换步骤,使用户能够仅给出单一查询,系统可以完全自动地访问多个空间数据源从而返回最终查询结果。该系统可作为空间信息集成的一个重要模块,并具有很强的可扩展性。According to the feature of spatial data sources, a method to express capability of the spatial data sources is presented, including exported schema, query capability and transformation capability. On this basis, query evaluation engine integrates the capa- bilities of the distributed spatial data sources to construct a sequence of procedures for the user＇s query by constructing schema graph and function graph. The goal is to give a user the ability to issue a single query that would access multiple sources automatically to receive the final result. It can be as an important module of spatial information integration system and has great extensibility.

关 键 词：空间数据源 数据源能力 导出模式 查询能力 转换能力 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]