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2006, Online unter: http://www. …
AI
The paper presents the OGC Web Service Access Framework (OX-Framework), an integrated software framework developed to facilitate the integration of various Open Geospatial Consortium (OGC) Web Services. The OX-Framework offers a flexible architecture that combines a Layer-Architecture, Plugin-Concept, and Listener-Concept to enable seamless access, visualization, and processing of diverse geospatial data. Aimed at both client and server applications, this framework aims to reduce the complexity of OGC-related software development, providing developers with a robust foundation for creating sophisticated service chains and supporting future sensor web projects.
International Journal of Geographical Information Science, 2011
OGC Web Services (OWS) are essential building blocks for the national and global spatial data infrastructure (NSDI and GSDI) and the geospatial cyberinfrastructure (GCI). Web Map Service (WMS), Web Feature Service (WFS), Web Coverage Service (WCS), and Catalogue Service for Web (CSW) have been increasingly adopted to serve scientific data. Interoperable services can facilitate the integration of different scientific applications by searching, finding, and utilizing the large number of scientific data and Web services. However, these services are widely dispersed and hard to be found and utilized with acceptable performance. This is especially true when developing a science application to seamlessly integrate multiple geographically dispersed services. Focusing on the integration of distributed OWS resources, we propose a layer-based service-oriented integration framework and relevant optimization technologies to search and utilize relevant resources. Specifically, (1) an AJAX (Asynchronous JAvaScript and eXtensible Markup Language)-based synchronous multi-catalogue search is proposed and utilized to enhance the multi-catalogue searching performance; (2) a layer-based search engine with spatial, temporal, and performance criteria is proposed and used for identifying better services; (3) a service capabilities clearinghouse (SCCH) is proposed and developed to address the service issues identified by a statistical experiment. A science application of data correlation analysis is used as an example to demonstrate the performance enhancement of the proposed framework.
Status of This Memo This memo provides information regarding the specification of service based interfaces to data resources. The specification is presently a draft for discussion. It does not define any standards or technical recommendations. Distribution is unlimited. Abstract Data resources play a significant role in many applications across multiple domains. Web services provide implementation neutral facilities for describing, invoking and orchestrating collections of networked resources. The GGF (Global Grid Forum) Open Grid Services Architecture (OGSA), and its associated specifications, defines consistent interfaces through web services to components of a grid infrastructure. Both the web and grid communities stand to benefit from the provision of consistent and agreed web service interfaces for data resources and the systems that manage them. This document presents a specification for a collection of generic data interfaces that can be extended to support specific kinds of ...
2006
This memo provides information regarding the specification of service based interfaces to data resources. The specification is presently a draft for discussion. It does not define any standards or technical recommendations. Distribution is unlimited. Copyright Notice Copyright © Global Grid Forum (2005). All Rights Reserved. Data resources play a significant role in many applications across multiple domains. Web services provide implementation neutral facilities for describing, invoking and orchestrating collections of networked resources. The GGF (Global Grid Forum) Open Grid Services Architecture (OGSA), and its associated specifications, defines consistent interfaces through web services to components of a grid infrastructure. Both the web and grid communities stand to benefit from the provision of consistent and agreed web service interfaces for data resources and the systems that manage them. This document presents a specification for a collection of generic data interfaces tha...
2006
Interoperability is one of the most important challenges related to GIS. Through the last years, research on interoperability has evolved from the simple off-line exchange of standardized-format files, through the establishment of spatial data clearinghouses, and to the first initiatives in the treatment of semantic aspects of data. The Open Geospatial Consortium (OGC) has proposed a number of standards to that respect, with the intention of promoting interoperability through the use of services. However, issues regarding fault tolerance, server-independent implementation, delayed-time transactions, privacy, and others reflect the need for further study and discussion. This paper discusses the current status of service-oriented architectures as applied to interoperable GIS, or, more specifically, to the implementation of local spatial data infrastructures (LSDI). A prototype designed to test the services abstract model by simulating a real-world use case is presented. Our conclusions indicate that some improvements may be helpful in the development of GIS/LSDI clients, as well as in the communication between thin clients and servers, supporting delayedtime transactions through asynchronous communication, and enabling clients to support fault-tolerant mechanisms without provider-dependent solutions.
Lecture notes in computer science, 2004
Proceedings of OCEANS 2005 MTS/IEEE, 2005
Web Services are often seen as the net-centric enabling technology for many US Navy operations. While Web Services are increasingly used for data distribution in a network centric environment, Web Services only constitute a baseline specification that provides the foundation on which application developers, under current approaches, write specialized software in order to retrieve data over the Internet. Software development and maintenance can increase with the increase in number of different available Web Services due to such factors as new XML schema, XML schema versioning differences and variations in interface methods.
2005
acquiring, processing and sharing geo-data among interested parties. In order to serve geographical information to users in such environment, Service Oriented Architecture (SOA) principles have gained great importance. In SOA-based systems, Information Services support the discovery and handling of these geospatial services.
IEEE Intelligent Systems, 2003
For some time now Web Services are touted as the technology-based solution to many different significant integration problems in information technology. These integration problems are of a so different nature that the following question cannot be avoided and must be asked right now: Web Services: Quo Vadis?
2012
Data resources play a significant role in many applications across multiple domains. Web services provide implementation neutral facilities for describing, invoking and orchestrating collections of networked resources. The OGF (Open Grid Forum) Open Grid Services Architecture (OGSA), and its associated specifications, defines consistent interfaces through web services to components of a grid infrastructure. Both the web and grid communities stand to benefit from the provision of consistent and agreed web service interfaces for data resources and the systems that manage them. This document presents a specification for a collection of generic data interfaces developed by the Database Access and Integration Services (DAIS) Working Group that can be extended to support specific kinds of data resources, such as relational databases, XML repositories, RDF data sources, or files. Related specifications define how specific data resources and systems can be described and manipulated through ...
International Journal of Data Mining Modelling and Management
Recent distributed computing trends advocate the use of Representational State Transfer (REST) to alleviate the inherent complexity of the Web services standards in building service-oriented web applications. In this paper we focus on the particular case of geospatial services interfaced by the OGC Web Processing Service (WPS) specification in order to assess whether WPS-based geospatial services can be viewed from the architectural principles exposed in REST. Our concluding remarks suggest that the adoption of REST principles, to specially harness the built-in mechanisms of the HTTP application protocol, may be beneficial in scenarios where ad hoc composition of geoprocessing services are required, common for most non-expert users of geospatial information infrastructures.
Geoinformatica, 2009
The Open Geospatial Consortium Web Processing Service specification is intended as a solution for creating and distributing web-based functions. This paper seeks to evaluate the WPS specification with respect to feasibility and utility, to identify areas for improvement, and to provide a demonstration implementation approach including a client-side tool and a server-side wrapping technique for exposing geoprocessing functionality through WPS using an asynchronous approach. Challenges with the WPS specification, some of which are already being addressed in the newest WPS revisions, are discussed together with proposed solutions. Several potential enhancements to the WPS proposal are introduced and considered, including a mechanism to guide client applications in prompting for correct data and a means to list the data available on a server.
Lecture Notes in Computer Science, 2006
The Open Geospatial Consortium (OGC) standards activities that focus on sensors and sensor networks comprise an OGC focus area known as Sensor Web Enablement (SWE). Readers interested in greater technical and architecture details can download the OGC SWE Architecture Discussion Paper titled “The OGC Sensor Web Enablement Architecture” (OGC document 06-021r1).
First Open Source GIS UK …, 2009
When developing client applications for OGC Web services, it is necessary to implement connectors that are able to interact with the according service interfaces. Since the interaction with OGC Web services is standardized and thus common for multiple client applications, the open source initiative 52°North started in 2006 the development of the OX-Framework -a software framework whose architecture can be used to ease and encapsulate the utilization of OGC Web Services. This framework has gained maturity in the past years and has recently been used as the technological basis for innovative Sensor Web applications in several projects. This work gives an overview of the framework's architecture and subsequently presents examples of open source Sensor Web applications built on top of it. Fig.1: Overview of the OGC SWE framework
Cooperative information systems support the interaction between organizations to reach common goals (De Michelis et al., 1997). In the Service Oriented Computing (SOC) paradigm, Web Services are fundamental elements for developing applications (Dayal, 2001). SOC involves different layers and roles, as described by the extended Service Oriented Architecture (SOA)(Papazoglou and Georgakopoulos 2003, Chung et al. 2003). The most popular service technologies and standards, including SOAP and XML Protocol, ...
The Open Geospatial Consortium Web Processing Service proposed specification is intended as a solution for developing web-based geoprocessing plugins, and for easily sharing algorithms and geoprocessing functionality. This paper seeks to evaluate the WPS proposal with respect to feasibility and potential utility, and to identify areas for improvement. Challenges with the WPS proposal are discussed together with potential solutions. Several potential enhancements to the WPS proposal are introduced and considered, including a mechanism to guide client applications in prompting for correct data and a means to list the data available on a server.
… Symposium, 2002. IGARSS'02. 2002 IEEE …, 2002
Web GIS (Geographic Information Systems) service systems provide the various GIS services of analyzing and displaying the spatial data with friendly user-interface. But, early systems don't support open environment and interoperability. It is difficult to access diverse data sources, which provide each spatial data format. And, these systems have the difficult of upgrading the function and reducing the cost of developing web GIS application.
GeoInformatics, 2005
The Open Geospatial Consortium (OGC) [1] defines a number of standards, both for data models and for online services, that has been widely adopted in the Geographical Information System (GIS) community. This has lead to a number of software development efforts, online data archives, and application communities. The emergence of Web Service technique overcomes the shortcoming of traditional Distributed Object technique and provides the interoperable capability of cross-platform and cross-language in distributed net environment. GIS services will be implemented more extensively by using Web Service approach. A spatial data infrastructure lets many GIS vendors share data stores and applications in a distributed environment. GIS basically involves the integration of data and services from multiple sources from different vendors. The Web services architecture establishes a standard interconnection rules between services and information clients that nicely support the dynamic integration of data, which is the key to creating a spatial data infrastructure. By introducing Web Services, distributed GIS services from different vendors can be dynamically integrated into the GIS applications using the interoperable standard communication protocols of the Web Services. To be able to benefit from the Web Services in the GIS applications, all the service providers should provide their services as Web Services. General acceptance from the vendors increases the interoperability and enhances the GIS applications. We find that the OGC standards are very compatible with Web Services standards, although they are not technically implemented this way. To be able to benefit from Web Services technologies we have built a common architecture to convert any OGC GIS services to Web Services and applied this to our current WMS project.
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