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Boulder, CO May 15, 2006

Data Discovery. Boulder, CO May 15, 2006. Scott Ritz Atmospheric Science Coordinator NASA Global Change Master Directory. Outline. OAI-PMH ( O pen A rchives I nitiative P rotocol for M etadata H arvesting) Mapserver Open API ( A pplication P rogram I nterface) SOAP Portals

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Boulder, CO May 15, 2006

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  1. Data Discovery Boulder, CO May 15, 2006 Scott Ritz Atmospheric Science Coordinator NASA Global Change Master Directory

  2. Outline • OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting) • Mapserver • Open API (Application Program Interface) • SOAP • Portals • DIF Format

  3. OAI-PMH Architecture OAI-PMH Repository Computer running harvester software • Why OAI-PMH? • OAI Server independent of main database • Administrator controls metadata availability • Queries standardized • Software is open source • Metadata Compatibility • Dublin Core, FGDC, DIF, ISO-19115 • XSLT or XML Schema II. • Harvesting Process • Metadata subset transferred from a database to a repository • Metadata is harvested from the repository Database I.

  4. Harvest THREDDS Metadata using OAI/PMH DLESE OAI/PMH Harvester 2. Monitor Harvest Status 3. Upload XML to a database 1. Automatic/Manual Harvest

  5. Harvest THREDDS Metadata using OAI/PMH 4. View harvested metadata in the GCMD Titles Display DIF Display Access THREDDS Data

  6. Prototype Mapserver Interoperability • Access GCMD’s Web Mapping Service (WMS) through an OGC WMS GET Capabilities Request. • OGC WMS compatible clients can access GCMD’s map services. User Friendly Desktop Internet GIS (WMS Client) GCMD Mapserver

  7. Open API DODS/OPeNDAP uses the GCMD open API and servlets to query the GCMD directly The “Search” frame provides interfaces to the GCMD’s MDServer through APIs HTTP Protocol

  8. SOAP Initiative • Initial SOAP Server and Client were created by Viktor Pusztai. • Documentation, JUnit tests, and Web GUI to test the Client were later added. • Future: • Modify to follow security standards for web services (ex. user authentication, encrypted passwords ) • Modify to offer different web services to serve specific needs. (ex. MetadataWebService, ValidsWebService, ServicesWebService, SubscriptionWebService, MetricsWebService, etc.)

  9. Valid Operations getValids getPersonnel createValid removeValid Operations Available in Current Server • Document Operations • createDocument • getDocument • getDocumentList • removeDocument • convertDocument • validateDocument

  10. Personnel Operations createPerson findPerson getClosePersons getPersons mergePerson removePerson Operations Available in Current Server • Other Operations • getCoordList • getDateTime • getDocumentList • getNodeName • getWebServerName • getWebServerPort • isAlive • supportsSERF

  11. Portals

  12. Portals

  13. DIF/SERF

  14. Questions? ritz@gcmd.nasa.gov 301-867-2082

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