ogc/grid activities in uk chris higgins (edina), phil james (uni of newcastle), andrew woolf (cclrc)
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OGC/Grid activities in UK
Chris Higgins (EDINA),
Phil James (Uni of Newcastle),
Andrew Woolf (CCLRC)
‘Grid-GIS’ ad-hoc
• Working Group of National Institute for Environmental e-Science, Cambridge (NIEeS, http://www.niees.ac.uk)
• Investigating funding possibilities
• Developing roadmap for Grid-GIS research
JISC Grid-OGC Collision Programme
• Call came out March 2006• Area A on Security (EDINA SEE-GEO project)• Area B on Workflow (Newcastle SAW-GEO project)• Area C on OGC Liaison (EDINA leading)
SEE-GEO
• SEcurE access to GEOspatial services (started Oct 10 2006)
• Emphasis on building on existing UK e-infrastructure• Particularly:
– National Grid Service (NGS)– JISC funded National Datacentres – MIMAS and EDINA– Shibboleth
• Partners:– EDINA– MIMAS – National e-Science Centre (NeSC)– National Centre for e-Social Science (NCeSS)
SEE-GEO
• Aim is to investigate how core geographic datasets may be made available on the NGS to the UK academic sector
• Data access using OGC Web Services• Security using a combination of:
– Shibboleth– Grid Security Infrastructure– WS-Security (maybe)
• Main deliverables are a report and 3 demonstrators:1. National datacentre2. Social Science (NCeSS)3. Orchestration (Newcastle)
SEE-GEO – Highlights
• An example of Grid and Geospatial standards converging
• Integration of WMS, WFS and WCS into OGSA-DAI (Open Grid Services Architecture – Data Access and Integration)
• Open Grid Forum (OGF) OGC Liaison, e.g. workshop showcasing OGC/TC 211 standards at OGF20 in Manchester May 2007
SAW-GEO
• Development of Semantically Aware Workflow Engines for Geospatial Web Service Orchestration
• convergence of geographic web services and grid web services
• common need/possibility for integration of data from different sources
• role of existing standards in geographic web services• OGC
• WFS (web feature services); WMS (web map services); WCS (web coverage services); CSW (catalogue web services)
•equivalence to standards in grid web services• publish (UDDI); find/describe (WSDL); and bind (SOAP)
SAW-GEO
• proposed architecture
• chaining multiple web services together• semantically informed workflow management system and workflow
engine• workflow engine deployable onto Apache Tomcat• web portal into the workflow engine • use of OGSA-DAI wrappers and the Globus toolkit
SAW-GEO
OGC WCS
OGC WFS
OGC WMS
Clients
OGSA-DAI WCSOGSA-DAI WFSOGSA-DAI WMS
Workflow Managemen
t System
MapServer or
GeoServerGlobus Toolkit
SAW-GEO
EDINA Newcastle
Presenter Name
Facility Name
Resource-orientation in OGC
• Web Services Resource Framework (WSRF)– separates ‘service’ and ‘stateful resource’
upon which service acts– OASIS approved standard April 2006– WS-Resource:
• identity (WS-Addressing)• lifetime (WS-ResourceLifetime)• state/properties (WS-ResourceProperties)
– publish-subscribe mechanism for state changes (WS-Notification)
Presenter Name
Facility Name
Resource-orientation in OGC• Data as stateful resource?
– looser coupling between service and data– supports ‘service coherence model’– standard mechanism for handling latency– service consistency w.r.t. data resources
e.g. Workflow with ‘Grid-enabled’ OGC services through WSRF refactoring
Presenter Name
Facility Name
Resource-orientation in OGC
Grid storage ‘fabric’: SRB, DAIS, ...
Dataprovider
A
Dataprovider
CData
providerB
Serviceprovider
WCS
WFS
WMS
GetCoverage( <wsa:EndpointReference>...)
Presenter Name
Facility Name
Resource-orientation in OGC
• WSRF: HP, IBM
• Microsoft: WS-Transfer, WS-Eventing
• Recently:
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