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OPeNDAP/ECHO Demo Integrating and Chaining services

OPeNDAP/ECHO Demo Integrating and Chaining services. September, 2006 CEOS WGISS 22 Annapolis, MD. Demo Background. OPeNDAP Software framework which supports simple access and analysis of data Clients don’t have spatial/temporal search capability for data discovery ECHO

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OPeNDAP/ECHO Demo Integrating and Chaining services

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  1. OPeNDAP/ECHO DemoIntegrating and Chaining services September, 2006 CEOS WGISS 22 Annapolis, MD

  2. Demo Background • OPeNDAP • Software framework which supports simple access and analysis of data • Clients don’t have spatial/temporal search capability for data discovery • ECHO • Metadata and Service Registries • Provides extensive product search capabilities for discovery • Integration • Can OPeNDAP enabled software take advantage of ECHO search? • Can existing solutions like OPeNDAP work with ECHO? How hard is it? • History • Initial discussions between OPeNDAP and ECHO teams occurred in late October and November. • First phase prototype defined in November 2005, prototype pieces built in December 2005, and demonstrated in Jan 2006 at the ESIP Federation meeting. • Current state • Next step prototype: Search of ECHO, using ECHO web services, access & analysis of data all within Matlab analysis environment . • Prototype pieces built in spring 2006. • Modified Matlab GUI-ette expected to be used operationally in late 2006. Leveraging ECHO and Web Services to expand value of existing services

  3. Demo Scenario • Science Scenario • Scientist wants to investigate how rainfall affects sea surface temperature and validate his model for sea surface temperature with remote observations. • Presentation • Science View • Technology View Supporting real science scenario – validating models

  4. Matlab scripts ECHO Service Registry ECHO Data Catalog ECHO Test Bed Demo Walk Through Workstation Spatial/Temporal Query Parameters  Java class OPeNDAP Query Service SOAP Invocation  OPeNDAP URLs, selected metadata Spatial/Temporal Query Data Visualization and Analysis Metadata Ingest HyCOM Data Server (Miami, FL) GSFC (TRMM) JPL (MODISTerra)

  5. What Made the Demo Work? • We are using the work of an ongoing REASON project that provides OPeNDAP access to data pools at the GES DAAC and the PO.DAAC • Components • OPeNDAP Servers which provide access to data in GES DAAC and PO.DAAC data pools. • ECHO Testbed (Version 8.0) populated with metadata from GES DAAC data pool and the PO.DAAC • OPeNDAPQueryService returns the metadata results of query. Provides search by dataset, time, space, and keyword. Results have OPeNDAP URLs for online access. • Java Class reusable class which invokes the OPeNDAPQueryService. • Matlab “Gui-ette” presents user interaction, calls the java class, accesses the data via OPENDAP and visualizes the data for analysis • Interoperability • ECHO Testbed (Version 8.0) has a collection-level PSA referencing the OPeNDAP server. Granules OnlineAccessURL attribute populated with Data Pool URL. • OPeNDAPQueryService published in the ECHO Services registry, classified in DataSet Taxonomy for demo collections • Parallel Service & Metadata Registries in ECHO make the linkage work Integrating existing solutions to make science easier

  6. Total Effort for Prototype • OPeNDAPQueryService • Development (extending previous demo’s service) • ECHO Services Registry – new service published • ECHO Testbed • Version 8.0.3 • Populated with metadata • GES DAAC data pool (data of interest for demo) • PO.DAAC • Added Collection-level Product Specific Attribute for OPeNDAPServer • Java class • Invoke OPeNDAPQueryService through SOAP • Submit Query • Traverse Results - access the OPeNDAP URL information and granule ID information • Spatial/Temporal fields converted for Matlab usage • Matlab Gui-ette • Modified existing tool • Call java class • Additional script to access and analyze the new satellite data to select data to compare with the model data • Effort • Extending January demo (direct Matlab access) • Couple months of total effort New and innovative solutions with minimal effort

  7. Reflections • ECHO Lessons Learned • API Specifications include unspoken and implied assumptions • Did a great job of specifying the external service • Still assumed the sorting was ok • User-specified sorting of results (9.0 requirement) • Value of embedding access mechanisms • OPeNDAP Lessons Learned • Value of web services • Using wsdl to build clients was very easy using standard development tools • Generalized approach is portable and reusable

  8. ECHO Services & Metadata Registries Equal Middleware • ECHO provides Service-Oriented middleware support for • Enabling… • Catalog Services - metadata search • Services Registry - service definitions and access using standards • Existing systems can build on top of ECHO • Leveraging existing investments • Expanding the value by integrating into a Service Oriented Enterprise • ECHO Testbed • Will continue to be available for the community and welcomes additional participants! • Non-programmer development of analysis scripts • Support beyond Matlab is available • DAP services will be converted to Web Services • Published in ECHO Service Registry

  9. Points of Contact • OPeNDAP Dr. Peter Cornillon pcornillon@opendap.org • ECHO Michael Burnett mburnett@blueprinttech.com

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