摘要
提出了实现空间地理信息(SGI)远程分发的网格分发系统(GIGD)。以图的方式定义了网格资源节点,建立了SGI资源和网格资源的关系,给出了GIGD的形式化表示,构建了面向服务的6级分层网格模型,基于开放OGSA服务与接口定义模式设计了系列网格服务,实现了支持请求/应答服务模式、SGI无中心式网格分发的GIGD。资源查找过程中GridService和直接拷贝的性能比较表明:GridService的传输效率与直接拷贝模式相当,达到最大传输速率更快,对数据量的依赖性不强。
Geographic information grid dissemination system（GIGD） for disseminating spatial geographic information（SGI） to remote user is presented. Grid resource nodes, presented according to the graph theory, are defined. The relationships among SGI, grid resources and GIGD formal presentation are established. Six grades grid hiberarchy oriented to services and a series of user-defined grid services based on OGSA services and interfaces patterns are designed. GIGD flow without grid center is implemented to support request/response model. The performances of grid services and copy mode in the process of resources location are tested. The results show that Grid Services can achieve SGI dissemination effectively as copy mode, faster in maxiam transferring speed while less dependent on data flow.
出处
《计算机工程》
CAS
CSCD
北大核心
2007年第11期59-61,共3页
Computer Engineering
关键词
网格
空间地理信息
数据分发
网格模型
Grid
Spatial geographic information
Data dissemination
Grid model
