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Open Grid Forum 20 (OGF20) 7 th May, 2007 Gobe Hobona (University of Newcastle)

Development of S emantically A ware W orkflow Engines for GEO spatial Web Service Orchestration. Open Grid Forum 20 (OGF20) 7 th May, 2007 Gobe Hobona (University of Newcastle). Motivation for Geo-Workflows. Geospatial processes Route finding Constructive Area Geometry

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Open Grid Forum 20 (OGF20) 7 th May, 2007 Gobe Hobona (University of Newcastle)

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  1. Development of Semantically Aware Workflow Engines for GEOspatial Web Service Orchestration Open Grid Forum 20 (OGF20) 7th May, 2007 Gobe Hobona (University of Newcastle)

  2. Motivation for Geo-Workflows • Geospatial processes • Route finding • Constructive Area Geometry • Cartographic generalisation • and several others • Scheduled tasks • Monitoring geosensors • Backing up geospatial databases • Integration with OGSA • Provision of geospatial operations • Provision of geospatial databases

  3. An Example Geospatial Workflow Workflow Enactor WFS WPS 1 Generalise WPS 2 Clip

  4. Challenges • No OGC Workflow Specification • SOAP/WSDL interface • Geospatial data inherently very large • Synchronicity • Support for OGSA execution and resource management services

  5. SAW-GEO • A semantically-aware workflow engine for orchestrating geospatial web services • Involves the Business Process Execution Language (BPEL) • Related Studies • R. Lemmens, A. Wytzisk, R. d. By, C. Granell, M. Gould, and P. van Oosterom (2006), "Integrating Semantic and Syntactic Descriptions to Chain Geographic Services," IEEE Internet Computing, vol. 10, pp. 42-52. • P. Yue, L. Di, W. Yang, G. Yu and P. Zhao (2007), "Semantics-based Automatic Composition of Geospatial Web Service Chains", Computers & Geosciences , vol. 33, Issue 5, pp. 649-665

  6. System Components • ActiveBPEL workflow engine • Globus Toolkit 4 • Proxy Service • Geospatial web service containers (e.g. Geoserver) • Web Feature Service (WFS) • Web Coverage Service (WCS) • Web Processing Service (WPS) • Web Map Service (WMS)* • BPEL Editors • ActiveBPEL Designer • OMII-BPEL

  7. Alternatives Considered • Workflow Enactors • Taverna • Netbeans Enterprise Pack • Intalio PXE – now Apache ODE • SOAP-based web service containers • Apache Axis • JAX-WS (now pre-built into standard Java runtime)

  8. Evaluation • Need to examine scenarios varying in data availability, data volumes, data security, computational load, interface etc • EDINA collaboration will allow for testing of security issues • Performance with multiple use (increasing number of nodes as orchestration becomes more complex)

  9. Conclusions • BPEL suitable for orchestrating grid-based OGC web services • Support for SOAP/WSDL important for integration of OGC and OGSA services • Some issues remain unaddressed within geo services e.g. asynchronous invocation • SAW-GEO User Evaluation scheduled for Nov 07 – Dec 07

  10. Acknowledgements • SAW-GEO is funded by the Joint Information Systems Committee (JISC) through the Grid/OGC Collision Programme • Collaboration with the North East Regional e-Science Centre (NEReSC) • Thanks to ITC (Netherlands) and LAITS (George Mason University) for access to Web Processing Services

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