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. Computer running harvester software
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 I.
Database

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. Access mapserver through GCMD GIS Server Portal or directly from mapserver.

7. 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

8. 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

9. 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.)

10. Operations Available in Current Server
Valid Operations
getValids
getPersonnel
createValid
removeValid
Document Operations
createDocument
getDocument
getDocumentList
removeDocument
convertDocument
validateDocument
Access valids or request documents from the database

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

12. Portals

13. Portals

14. DIF/SERF

15. Questions?