1. * Working Group 4

2. 2 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl 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

3. 3 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl GT4 Migration – Status Report Internship: Pushkar Prasad Three components  Content publishing  Optimization service  Core Communication interfaces OGSI to WSRF

4. 4 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl 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.

5. 5 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl Stream-based Processing of VOEvents VOEvent  Description of observational events  Automatic follow-up observations XML-based Standardized by IVOA

6. 6 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl VOEvent - Subscriptions Current means  Subscription of mailing lists  RSS feeds  Manual filtering Data Stream Management System  More flexibility in subscriptions  Automatic filtering

7. 7 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl Deliverable D4.3 Query processing on persistent data Existing technologies Integration  Established services  Data sources

8. 8 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl SkyNode Web service interface Astronomical data  Catalogs  Catalog Metadata Publication at VORegistry Common interface for Client applications  OpenSkyQuery  ADQL

9. 9 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl 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

10. 10 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl 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?

11. 11 AstroGrid-D Meeting, Heidelberg 2006-07-25 Tobias Scholl Working Group 4 Thank You for Your Attention! Further Questions?