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遥感技术与应用  2011, Vol. 26 Issue (6): 763-770    DOI: 10.11873/j.issn.1004-0323.2011.6.763
图像与数据处理     
一种面向按需处理的空间数据服务模型与实验分析
曾怡1,李国庆2

(1.北京林业大学信息学院,北京100083;2.中国科学院对地观测与数字地球科学中心,北京100086)
Research of On-demand Service Oriented Spatial Data Model
Zeng Yi1,Li Guoqing2
(1.Information School,Beijing Forestry University,Beijing 100083,China;
2.Center for Earth Observation and Digital Earth,Chinese Academy of Sciences,Beijing 100086,China)
 全文: PDF(2807 KB)  
摘要:

通过传统空间数据服务系统获取的数据并不是满足用户需求的最终产品。对于地学领域的用户,通常需要根据特定应用目标,花费大量的时间进行数据预处理,从而满足特定的子区范围、波段和图像格式等。通过分析地学应用中针对数据源的操作要求,研究具有按需处理能力的空间数据服务模型,将各种分布的计算资源和数据资源联合起来,按照用于定制的需求,在为用户提供数据前,对数据进行一定的加工。通过对空间数据服务的基本操作进行分类和规范,研究建立兼容OGC WCS标准的数据服务机制,将大量基础性的数据预处理任务集成到数据获取流程中,以满足用户获取更高级别数据的需求。同时利用该模型在空间信息网格平台SIG(Spatial Information Grid)上进行验证,选择若干典型数据源,部署按需处理服务功能组件,对服务响应能力进行实验与评估。详细讨论了空间数据按需处理的流程,并将实验结果与传统方法进行对比分析。

关键词: 地理信息服务数据按需处理数据网格WCS    
Abstract:

Traditional spatial data system always can not offer data product to meet final customer needs.Scientists in earth observation field often spend a lot of time on data preprocessing,in order to adapter specific sub\|area,image band or file format for application request,even if the final calculation and analysis is very simple.The on\|demand spatial data services technology,aims to integrate distributed computing resources and data resources together,perform various geospatial process functions for user demands.In this paper we propose an on\|demand oriented spatial data service model,which integrate a large number of fundamental pre-processing tasks into data access procedure,and minimize the time cost.In order to build proper mechanism for data service,we have a close examination of the basic operation involve with data source,and classify these operations into some service module,combined with functions described in OGC service specifications.Thus,the model based on OGC WCS standards can provide high level spatial data products to meet applications requests.We use this on\|demand data service model in Spatial Information Grid platform for case study,and conducted close examination of comparison study with traditional methods.Through the experiment we can concluded:for traditional spatial data service,results returned by the query identifiers.Users retrieve data items and copy the data to local storage by the physical file names.Two parts greatly impacted process performance,which is time for data transmission to local side,and time for local preprocessing in client side.As to the system build with on demand data service model,data acquisition is customizable.The on\|demand operations are done on the server side.The data has been manipulated according to specific operation requirements before transmitting to the user.This method better improves geo-information processing efficiency,and reduces additional time waste on preprocessing.

Key words: Geographic information server    On-demand service    Data grid    WCS
收稿日期: 2011-06-28 出版日期: 2012-01-10
:  TP 751.1  
基金资助:

北京林业大学青年科技启动基金(2010BLX15)资助。

作者简介: 曾怡(1980-),女,湖北武汉人,博士,讲师,主要从事空间数据服务与林业信息资源管理研究。Email:zeng.bjfu@yahoo.com.cn。
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引用本文:

曾怡,李国庆. 一种面向按需处理的空间数据服务模型与实验分析[J]. 遥感技术与应用, 2011, 26(6): 763-770.

Zeng Yi,Li Guoqing. Research of On-demand Service Oriented Spatial Data Model. Remote Sensing Technology and Application, 2011, 26(6): 763-770.

链接本文:

http://www.rsta.ac.cn/CN/10.11873/j.issn.1004-0323.2011.6.763        http://www.rsta.ac.cn/CN/Y2011/V26/I6/763

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