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Progress on Metadata Issues for Ocean Observing Stephanie Watson, CeNCOOS Julie Bosch, NOAA NCDDC Presented at the QARTOD II Workshop, 2/28-3/2/05
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Overview Metadata in IOOS Data Management and Communications (DMAC) plan and subsequent issue paper COTS/ONR Metadata Working Group for IOOS Interoperability II Marine Metadata Interoperability (MMI) Initiative –Example resources for wave and current metadata Contributions from this workshop
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IOOS DMAC Plan Metadata Data discovery Data transport On-line browse Data archive DMAC plan, 2003
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Metadata Needs in DMAC Plan Determine IOOS metadata content and format standards Develop tools and procedures to support metadata providers Select (or develop) and maintain catalog and search capability Develop discovery interface for archive system Design discovery portal Study alternative discovery approaches Design and implement data location service Initial recommendations: FGDC and catalog
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Example additional metadata issues Design FGDC v. 3/ISO 19139-compliant profile(s) (machine readable) Translators for all FGDC v.2 records (incl. Profiles and Extensions) into machine-readable ISO 19139 Platform or sensor-related info. in metadata Use cases in guidance Catalog synchronization Consider use of OGC specifications (e.g., Web Catalog Service) Consider use of UDDI, SOAP, WSDL, ISO 11179 metadata registries Formalize vocabularies/thesauri/ontologies in XML/RDF/OWL and submit to online library Other recommendations (e.g., metadata in XML)
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Addressing these metadata issues will happen in 3 stages I. Inventory what’s already available (time scale: sub-year) II. Identify best practices from among the inventory items (time scale: sub- year) III. Develop community-based standards (time scale: years)
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COTS/ONR Metadata Working Group Participants: Anne Ball (lead), Julie Bosch, Stephanie Watson, Rob Bochonek, Dwayne Porter, Steve Collins Task: Develop a work plan to develop metadata to enable the IOOS Interoperability Demo II –Demo I: www.openioos.org (winds, SST)www.openioos.org –Demo II will add waves, surface currents, chlorophyll in regional natural hazards framework
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Definitions Data Dictionary includes the metadata elements (terms) necessary to describe the data sets: –name, abbreviation (label), definition, units, scope the domain and/or range of values, data type (actual measurement, derived, model result), source, for example Thesaurus - hierarchical and synonym information for each term entry, as well as the identification of the source of the related terms -- allows mapping between different data dictionaries
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COTS/ONR Metadata WG Milestones I. (6 months) Version 1 of an IOOS/COTS Data Dictionary with contents describing the metadata elements required for the automatic discovery, access and use of SST, wind, waves, surface current and chlorophyll data. II. (12 months) Metadata Guidance for IOOS/COTS Data Providers - to include Use Cases which incorporate data dictionary content and thesaurus information into the metadata standard(s) used by the Interoperability II demonstration
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Tasks Jan 15Identify Staff Feb 1Identify web workspace Feb 15 Establish 5 sub-groups (1 per variable) Feb 15Identify metadata elements required, drawing from existing efforts Mar 1Establish structure of metadata elements Apr 1Draft data dictionary and thesaurus May 1Final data dictionary and thesaurus June 30Milestone I complete Aug 1“How to” guidance Sept 1Publish guidance to web Oct 1Develop examples (“use cases”) – involving a variety of forms e.g., NetCDF headers, FGDC, SensorML Dec 1Metadata available for Interoperability II demo Dec 30Publish guidance on how to add new parameters to demo Dec 31Milestone II complete
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Some Additional Considerations Continuously coordinate with the other COTS/ONR working groups Build on work already accomplished or in development Additional tools may need to be developed (e.g., automated access to data dictionaries/thesauri) Develop in compliance with FGDC/ISO 19115/19139 (latter is the draft specification used by the OGC web services) Make metadata available via a catalog service (data discovery)
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Marine Metadata Interoperability (MMI) Initiative Funded by NSF, with additional support from SURA/SCOOP Lead PI: John Graybeal (MBARI). Other partners: Scripps, LDEO, OSU, WHOI, SURA/SCOOP, UHawaii, NOAA, UKansas, NASA, BODC (international) Contact information: –Luis Bermudez, MMI Liaison bermudez@mbari.org bermudez@mbari.org –www.marinemetadata.orgwww.marinemetadata.org
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MMI Mission and Objectives Mission: To promote the exchange, integration and use of marine data through enhanced data publishing, discovery, documentation and accessibility. Objectives: –Provide guidance and reference documentation on properly using and developing metadata solutions for the ocean science community; –encourage community involvement in the development and evaluation of the documentation; and –use two test-bed activities to demonstrate the functions of metadata in cross-platform, cross- disciplinary, interoperable distributed data systems
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Organization of the MMI Website Http://marinemetadata.org
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San Francisco Bay image showing currents and waves
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Metadata terms/data dictionary currents – some sources id’d via MMI “CODAR in FGDC” - developed by domain experts at Marine Metadata Workshop, 10/03 http://cuahsi.sdsc.edu/html/metadataresources.html http://cuahsi.sdsc.edu/html/metadataresources.html ADCP examples started at the metadata workshop (excel spreadsheet) and some suggested metadata elements at http://mmug.calfish.org/adcp.htm http://mmug.calfish.org/adcp.htm SEACOOS Data Dictionary http://nautilus.baruch.sc.edu/seacoos_dd/php/dd_logi n.php http://nautilus.baruch.sc.edu/seacoos_dd/php/dd_logi n.php Others from MMI website: http://marinemetadata.org/vocabularies/refs http://marinemetadata.org/vocabularies/refs
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CF, BODC metadata elements: currents CF metadata elements –eastward_sea_water_velocity –northward_sea_water_velocity –upward_sea_water_velocity –direction_of_sea_water_velocity –sea_water_speed BODC metadata elements - Horizontal velocity of the water column - Vertical velocity of the water column - Raw current meter output parameters http://marinemetadata.org/vocabularies/examples/ioos/ http://marinemetadata.org/vocabularies/examples/ioos/
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http://www.isracam.co.il/swell.htm CORTEZ BANK
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Metadata terms/data dictionary waves – some sources NDBC/CDIP/NCDDC working group for spectral wave metadata SEACOOS Data Dictionary http://nautilus.baruch.sc.edu/seacoos_dd/php/dd_logi n.php http://nautilus.baruch.sc.edu/seacoos_dd/php/dd_logi n.php Others from MMI website: http://marinemetadata.org/vocabularies/refs http://marinemetadata.org/vocabularies/refs
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NDBC/CDIP working group for spectral wave metadata Example: –1. Entity: sea state 1.1 Attribute: Significant wave height –1.1.1. Units: Length: meter –1.1.2. Method of Determination: Estimation Zeroth Spectral Moment –1.1.3. Source: spectral density –1.1.4. Availability of Source: available 1.2 Attribute: Spectral peak period –1.2.1. AKA: Dominant Period –1.2.2. Unites: Time: Second –1.2.3 Method of Determination: Maximum spectral density –1.2.4. Source: spectral density –1.2.5. Availability of Source: available…
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CF, BODC metadata elements for IOOS variable: waves CF metadata elements –significant_height_of_wind_waves –direction_of_wind_wave_velocity –swell_wave_period –direction_of_swell_wave_velocity –wind_wave_period –significant_height_of_swell_waves BODC Surface_waves –Wave height and period statistics –Wave direction –'Other' wave statistics –Spectral wave data parameters http://marinemetadata.org/vocabularies/examples/ioos/
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Contributions from this workshop – identify: Terminology required to discover and use the wave and current data Definitions for each term Labels for each term Domains (acceptable values) Ranges Units Quality control flags
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Thesaurus example GCMD terms for IOOS variable: currents IOOS variable: currents GCMD synonyms: Ocean_Currents Tidal_Currents
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Currents Ocean_Currents Tidal_Currents eastward_sea_water_velocity northward_sea_water_velocity IOOSGCMDCF Surface_waves significant_height_of_wind_waves direction_of_wind_wave_velocity swell_wave_period direction_of_swell_wave_velocity wind_wave_period significant_height_of_swell_waves No GCMD For waves IOOS variables and related terminology from other common Keyword lists/metadata conventions see http://marinemetadata.org/vocabularies/examples/ioos/http://marinemetadata.org/vocabularies/examples/ioos/
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IOOS Interoperability Demonstration I
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