Schema matching is a critical step in the integration of heterogeneous web service,which contains various types of web services and multi-version services of the same type.Mapping loss or mismatch usually occurs due t...Schema matching is a critical step in the integration of heterogeneous web service,which contains various types of web services and multi-version services of the same type.Mapping loss or mismatch usually occurs due to schema differences in structure and content and the variety in concept definition and organization.Current instance schema matching methods are not mature enough for heterogeneous web service because they cannot deal with the instance data in web service domain and capture all the semantics,especially metadata semantics.The metadata-based and the instance-based matching methods,in the case of being employed individually,are not efficient to determine the concept relationships,which are crucial for finding high-quality matches between schema attributes.In this paper,we propose an improved schema matching method,based on the combination of instance and metadata(CIM)matcher.The main method of our approach is to utilize schema structure,element labels,and the corresponding instance data information.The matching process is divided into two phases.In the first phase,the metadata-based matchers are used to compute the element label similarity of multi-version open geospatial consortium web service schema,and the generated matching results are raw mappings,which will be reused in the next instance matching phase.In the second phase,the designed instance matching algorithms are employed to the instance data of the raw mappings and fine mappings are generated.Finally,the raw mappings and the fine mappings are combined,and the final mappings are obtained.Our experiments are executed on different versions of web coverage service and web feature service instance data deployed in Geoserver.The results indicate that,the CIM method can obtain more accurate matching results and is flexible enough to handle the web service instance data.展开更多
针对离散型生产车间质量控制水平存在差异性问题以及数字化制造环境的跨平台运行特点,提出了在Web环境下质量数据实时传递、处理,质量状态在线控制的系统模式,分析了系统功能体系结构,并运用SPC(Statistical Process Control)理论和Web...针对离散型生产车间质量控制水平存在差异性问题以及数字化制造环境的跨平台运行特点,提出了在Web环境下质量数据实时传递、处理,质量状态在线控制的系统模式,分析了系统功能体系结构,并运用SPC(Statistical Process Control)理论和Web服务技术开发了动态质量控制系统。重点介绍了质量控制服务功能的实现方法,通过应用验证了基于Web服务的质量控制系统的可行性,从而使数字化车间的质量控制系统实现网络化和集成化。展开更多
随着海图信息价值的不断提升,海洋空间信息不再只是以航海图书产品和专题信息图件服务于固定的使用者,网络海图服务逐渐成为支撑海洋空间决策的重要基础。分析传统航海图书资料产品模式的不足,研究以基础数据资源层、关键技术支撑层、...随着海图信息价值的不断提升,海洋空间信息不再只是以航海图书产品和专题信息图件服务于固定的使用者,网络海图服务逐渐成为支撑海洋空间决策的重要基础。分析传统航海图书资料产品模式的不足,研究以基础数据资源层、关键技术支撑层、信息服务平台层、行业专题服务模式层和典型行业应用5个层次的网络海图服务总体框架,基于ArcGIS Nautical Solution和ArcGIS for Server技术,介绍实现海洋空间数据的互操作、多尺度数据管理和可视化、Web服务访问接口等网络海图服务关键技术,提出面向海事行业的网络海图服务模式。通过开发“中国北方海区海洋测绘地理信息服务平台”,实现海洋空间信息在线显示与发布,为行业提供信息浏览、信息查询服务、实时动态标注,数据自动同步和共享功能。展开更多
In recent years,Representational State Transfer(REST)has been proposed as the architectural style for the World Wide Web.REST promises of scalability and simple deployment of Web Services seem to be particularly appea...In recent years,Representational State Transfer(REST)has been proposed as the architectural style for the World Wide Web.REST promises of scalability and simple deployment of Web Services seem to be particularly appealing for Earth and Space Science(ESS)applications.In fact,most of the available solutions for geospatial data sharing,applying standard interoperability specifications,require complex service-oriented infrastructures;these are powerful and extensible environments,but they usually result in difficult to deploy and manage for ESS research teams.Thus,ESS researchers would gain great benefit from an easy way of sharing geo-information using the international interoperability standards.The variety and complexity of geo-information sharing services poses several architectural issues;in fact these services encompass sensor planning and observation,coverages and features publication and retrieving,models and simulations running,data citation and annotation.Consequently,the adoption of a specific architectural style must be carefully evaluated against these specific requirements.In this work we analyse the existing geospatial services from an architectural perspective and investigate their possible RESTful implementation.Particular attention is paid to the OGC Web Coverage Service(WCS).Possible benefits and drawbacks,along with open issues and possible solutions are discussed.Our investigation suggests that REST may fit well to the typical ESS research usage cases.However,the architectural choice(e.g.Simple Object Access Protocol(SOAP)vs REST)will depend on a case-by-case analysis.Other important factors must be considered,such as the application context:a valuable example in point are the e-Business and e-Government application scenarios which require message based solutions-like those implemented by SOAP.In any case,there is a clear need for harmonization and reconciliation of these two approaches.展开更多
基金This work was supported by the National Natural Science Foundation of China[grant number 41201393]the Open Research Fund of State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing of Wuhan University[grant number 14I03].
文摘Schema matching is a critical step in the integration of heterogeneous web service,which contains various types of web services and multi-version services of the same type.Mapping loss or mismatch usually occurs due to schema differences in structure and content and the variety in concept definition and organization.Current instance schema matching methods are not mature enough for heterogeneous web service because they cannot deal with the instance data in web service domain and capture all the semantics,especially metadata semantics.The metadata-based and the instance-based matching methods,in the case of being employed individually,are not efficient to determine the concept relationships,which are crucial for finding high-quality matches between schema attributes.In this paper,we propose an improved schema matching method,based on the combination of instance and metadata(CIM)matcher.The main method of our approach is to utilize schema structure,element labels,and the corresponding instance data information.The matching process is divided into two phases.In the first phase,the metadata-based matchers are used to compute the element label similarity of multi-version open geospatial consortium web service schema,and the generated matching results are raw mappings,which will be reused in the next instance matching phase.In the second phase,the designed instance matching algorithms are employed to the instance data of the raw mappings and fine mappings are generated.Finally,the raw mappings and the fine mappings are combined,and the final mappings are obtained.Our experiments are executed on different versions of web coverage service and web feature service instance data deployed in Geoserver.The results indicate that,the CIM method can obtain more accurate matching results and is flexible enough to handle the web service instance data.
文摘针对离散型生产车间质量控制水平存在差异性问题以及数字化制造环境的跨平台运行特点,提出了在Web环境下质量数据实时传递、处理,质量状态在线控制的系统模式,分析了系统功能体系结构,并运用SPC(Statistical Process Control)理论和Web服务技术开发了动态质量控制系统。重点介绍了质量控制服务功能的实现方法,通过应用验证了基于Web服务的质量控制系统的可行性,从而使数字化车间的质量控制系统实现网络化和集成化。
文摘随着海图信息价值的不断提升,海洋空间信息不再只是以航海图书产品和专题信息图件服务于固定的使用者,网络海图服务逐渐成为支撑海洋空间决策的重要基础。分析传统航海图书资料产品模式的不足,研究以基础数据资源层、关键技术支撑层、信息服务平台层、行业专题服务模式层和典型行业应用5个层次的网络海图服务总体框架,基于ArcGIS Nautical Solution和ArcGIS for Server技术,介绍实现海洋空间数据的互操作、多尺度数据管理和可视化、Web服务访问接口等网络海图服务关键技术,提出面向海事行业的网络海图服务模式。通过开发“中国北方海区海洋测绘地理信息服务平台”,实现海洋空间信息在线显示与发布,为行业提供信息浏览、信息查询服务、实时动态标注,数据自动同步和共享功能。
文摘In recent years,Representational State Transfer(REST)has been proposed as the architectural style for the World Wide Web.REST promises of scalability and simple deployment of Web Services seem to be particularly appealing for Earth and Space Science(ESS)applications.In fact,most of the available solutions for geospatial data sharing,applying standard interoperability specifications,require complex service-oriented infrastructures;these are powerful and extensible environments,but they usually result in difficult to deploy and manage for ESS research teams.Thus,ESS researchers would gain great benefit from an easy way of sharing geo-information using the international interoperability standards.The variety and complexity of geo-information sharing services poses several architectural issues;in fact these services encompass sensor planning and observation,coverages and features publication and retrieving,models and simulations running,data citation and annotation.Consequently,the adoption of a specific architectural style must be carefully evaluated against these specific requirements.In this work we analyse the existing geospatial services from an architectural perspective and investigate their possible RESTful implementation.Particular attention is paid to the OGC Web Coverage Service(WCS).Possible benefits and drawbacks,along with open issues and possible solutions are discussed.Our investigation suggests that REST may fit well to the typical ESS research usage cases.However,the architectural choice(e.g.Simple Object Access Protocol(SOAP)vs REST)will depend on a case-by-case analysis.Other important factors must be considered,such as the application context:a valuable example in point are the e-Business and e-Government application scenarios which require message based solutions-like those implemented by SOAP.In any case,there is a clear need for harmonization and reconciliation of these two approaches.
