Working Group 4

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Working Group 4
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Astrometric Matching Prototype (D4.2)

• 50 RASS-BSC sources
• Correlation with five archives (2MASS, FIRST,
  GSC, NVSS, USNOB)
• User-defined functionality
• Coordination transformation
• Cone-search
• Uncertainty handling
• Chi-squared-based filtering
• Merge join

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GT4 Migration Status Report

• Internship Pushkar Prasad
• Three components
• Content publishing
• Optimization service
• Core Communication interfaces
• OGSI to WSRF

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Clustered Query Processing(Cooperation with Alex
Szalay, JHU)

• Database server cluster
• Specific spatial clustering in zones
• Optimized for
• Cone searches
• Crossmatches
• Interrelation between
• Zone height clustering
• Search- and matching radii

Image by J. Gray et al.
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Stream-based Processing of VOEvents

• VOEvent
• Description of observational events
• Automatic follow-up observations
• XML-based
• Standardized by IVOA

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VOEvent - Subscriptions

• Current means
• Subscription of mailing lists
• RSS feeds
• Manual filtering
• Data Stream Management System
• More flexibility in subscriptions
• Automatic filtering

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Deliverable D4.3

• Query processing on persistent data
• Existing technologies
• Integration
• Established services
• Data sources

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SkyNode

• Web service interface
• Astronomical data
• Catalogs
• Catalog Metadata
• Publication at VORegistry
• Common interface for Client applications
• OpenSkyQuery
• ADQL

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OGSA-DAI

• Open Grid Services Architecture (OGSA)
• Data Access and Integration (DAI)
• Incorporation of data resources in Grid
  frameworks
• Relational Databases
• XML Databases
• Data Files
• AstroGrid (UK), D-Grid
• GGF DAIS Working Group

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Streaming of Persistent Data

• Correlation of Streaming and Persistent Data
• Sensor/telescope
• previous observations/simulations
• What results do we expect?
• As in persistent processing?
• Changes in semantics?

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Working Group 4

• Thank You for Your Attention!
• Further Questions?