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Web Service and Geographical Information Integration

Web Service and Geographical Information Integration —— Peking Spatial Applications Integrating Infrastructure, A Research for Spatiality-oriented Web Service Application Lab of Spatial Information System@PKU http://gis.pku.edu.cn lyw@pku.edu.cn. Syllabus.

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Web Service and Geographical Information Integration

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  1. Web Service and Geographical Information Integration —— Peking Spatial Applications Integrating Infrastructure, A Research for Spatiality-oriented Web Service Application Lab of Spatial Information System@PKU http://gis.pku.edu.cn lyw@pku.edu.cn

  2. Syllabus • Introduction of Spatial Application • Design Intention of Peking Spatial Applications Integrating Infrastructure(PAI) • Web Service-Based Distributed Spatial Information Disposition Architecture • QoS Strategies in Spatial Information Integration & Disposition • An Example for PAI-Organized Applications

  3. Introduction of Spatial Application • Characteristic of Spatial Information and Manipulation Platform • Spatial information: • Massive; • Long time of data sedimentation; • Multiple spatial data models; • Adhere to certain GIS platform to be accessible; … • Spatial information manipulation platform: • Data stored in heterogeneous GIS(dominated as MapInfo, ArcInfo) platform or inner spatial module presented by certain manufacturers(Oracle Spatial by Oracle); • Relevant services, product series based on platform self-defined organization; • Single accessible data portal; …

  4. Introduction of Spatial Application • Characteristic of Conventional Spatiality-oriented Application • Direct development of application based on platform-critical architecture; • Spatial information visualization, query, and edition at the front end based on homogeneous data storage at the back end; • Whenever inter-platform integration is needed, the writing of application-related adapter software for each participating platform is used; • ……

  5. Introduction of Spatial Application • Challenges imposed by nowadays spatial data integration: • Participated by processes running on heterogeneous platforms from multiple organizations; • Integrating existed spatial application systems; • Implement of dynamic integration accounting for on-time subsystem scalability; • Refining of existing services to present QoS attributes during integrated service formation; • Semantic level interoperation to obtain automatic service communication and assemblage; • ……

  6. Introduction of Spatial Application • Which we are confronted lies in that: Prevalent large-scaled spatial applications(Digital City, E-Government) call for a more flexible, dynamical, semantic integration among existing legacy data, system, platform and framework.

  7. Introduction of Spatial Application • Work of OGC in Improvement of Spatial Interoperability • A common architectural framework for web-based geospatial services; • Concentrating on definition of behavior of functional components common to all such services and extensible for specific services and service types; • Specification for distributed computing interaction, distributed computing workflow • Our Emphasis: Above-base integration of Web Services to obtain dynamic interoperation

  8. Syllabus • Introduction of Spatial Application • Design Intention of Peking Spatial Applications Integrating Infrastructure(PAI) • Web Service-Based Distributed Spatial Information Disposition Architecture • QoS Strategies in Spatial Information Integration & Disposition • An Example for PAI-Organized Applications

  9. Design Intention of PAI • The main goal of PAI infrastructure is to provide open second-time developing platform of spatial information application integration; • Provide united sharing mechanism and support technologies to access and acquire spatial information; • Solve distributing and heterogeneity of spatial applications(such as heterogeneity of GIS platforms,systems, expression and semantic collision); • Provide interoperation platform for isolated spatial applications

  10. Design Intention of PAI • Reasons for the construction of PAI based on Web Service oriented distributed framework • Web Service concentrates on fast conformity and deployment of legacy systems, which facilitates the integration of existing spatial applications; • Web service can separate system implementation and function interfaces by function publishing as services, which permits flexible function replacement in implementation aspect; • Security of sensible data and relevant services inside some industries are well protected because of the separation between interfaces and implementations

  11. Syllabus • Introduction of Spatial Application • Design Intention of Peking Spatial Applications Integrating Infrastructure(PAI) • Web Service-Based Distributed Spatial Information Disposition Architecture • QoS Strategies in Spatial Information Integration & Disposition • An Example for PAI-Organized Applications

  12. Web Service-Based Distributed Spatial Information disposition Architecture

  13. Syllabus • Introduction of Spatial Application • Design Intention of Peking Spatial Applications Integrating Infrastructure(PAI) • Web Service-Based Distributed Spatial Information Disposition Architecture • QoS Strategies in Spatial Information Integration & Disposition • An Example for PAI-Organized Applications

  14. QoS Strategies in Spatial Information Integration & Disposition • Problems deserved consideration in current integration: • Massive spatial information presented in GML format in PAI to ease interaction, while GML is pain-text format, which leads to deficiency in transmission; • Frequent map retrieval which calls for data caches to be maintained both in Adapter Service or in Integrating Coordinator(IC) Layer; • Differentiated Services of map to the clients which have different network situations and application requirements; • ……

  15. QoS Strategies in Spatial Information Integration & Disposition • Current QoS Strategies in PAI • GML data compression • During data transformation & client-end transmission; • Compression editions maintained in caches of IC Layer • Implementation of cache mechanism flexible to multiple spatial data granularities • Caches byAdapter Service, IC Layer & Web browsers • Elaborate selection of content-equivalent data providers • Non-function facets, history records & fatal parameters of Web services • Other QoS-related Differentiated Services • Vector map clipping, On-line map generation …

  16. QoS Strategies in Spatial Information Integration & Disposition A typical application aided by QoS strategy based on PAI architecture

  17. QoS Strategies in Spatial Information Integration & Disposition • Typical Workflows:

  18. Syllabus • Introduction of Spatial Application • Design Intention of Peking Spatial Applications Integrating Infrastructure(PAI) • Web Service-Based Distributed Spatial Information Disposition Architecture • QoS Strategies in Spatial Information Integration & Disposition • An Example for PAI-Organized Applications

  19. Examples for PAI-Organized Applications • We have implemented the LBS service based on PAI framework • Designed for both mobile terminal and PC • Provides some location-based services • finding the nearest service facilities (for example banks) • getting the nearest services facilities • finding the position of oneself or one’s friends • getting the relevant information about appointed position • ……

  20. Examples for PAI-Organized Applications

  21. An Example for PAI-Organized Applications Web Client PC、Mobile phone、multimedia message、laptop and so on Web Application LBS Server Integrated Coordinator LBS Worker GML Retriever Distributed Services Metadata services, Spatial data gateway, GML analyzing services, Format adapt Services Distributed Information Metadata database, Spatial data file, Database and map layer file on Oracle Spatial, Geo-Union, MapInfo Components of Layers in LBS

  22. An Example for PAI-Organized Applications

  23. Another Work in Our Lab A GML-bases lightweight WebGIS system PKGML http://map.pku.edu.cn

  24. Thank You！ Lab of Spatial Information System@PKU http://gis.pku.edu.cn lyw@pku.edu.cn

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