2022 09 07 TT WIGOSMD 27

Task Team WIGOS Metadata (TT-WIGOSMD-27)

07 Sep 2022, 12:00-13:30 UTC; online

Agenda & Notes

• Welcome, adoption of minutes (5', jkl)
• Secretariat updates (5', AM)
  • reminders
    • next amendments for FT2023-1 need to be complete by mid-December
    • Team will meet on the 1st and 3rd weeks of the month on Thursdays 12-13:30UTC, ensure next meeting has a chair.
    • GitHub changes
      • https://github.com/wmo-im/tt-wigosmd
      • new repositories
      • issue templates are improved
    • FT2022-2 feedback: https://github.com/wmo-im/wmds/issues/415#issuecomment-1236866343
• WMDR evolution (jkl)
  • the chairs of WIS, WIGOS metadata and CDM teams need to meet to discuss the scoping of metadata standards in WMO
  • The WIGOS Metadata Standard is a WMO publication (WMO-No. 1192) describes what kind of information is needed. It's not technical, lists 10 categories and "it's a long shot" to the metadata representation. The UML model for WIGOS metadata was developed in 2015 and approved by WMO. It supports the exchange in OSCAR. WIGOS metadata does not exist ONLY for OSCAR/Surface. It was designed to be an exchange format for documenting observations at at regional and international levels. The WIGOS UML model was built around ISO 19156:2011 (O&M). The OGC SWG for O&M is developing (with ISO) a new version. ISO 19156:2022 will be published this year and it cancels the previous standard. This is one of the primary drivers for evolving WMDR. We also have new requirements for WMDR.
  • WMDR has specialized concepts of O&M and realized in XML. Most of WMDR is an extension to O&M. The OMS standard has officially incorporated a lot of the concepts that were WMDR extensions, e.g. "host" and "observer". In OMS, "observer" can be a human or sensor, "host" can be the platform, "observing procedure": process, etc. The "observation" class describes the properties for creating a result.
  • (John) can you explain why the "result" box is outside the wigos metadata box? (Joerg) in OMS the result is part of the standard, but WIGOS metadata are not the carrier of data. The result is the data. Maybe it sits on the boundary of the WIGOS metadata.
  • (David) the result belongs to the observation and it should belong outside the WIGOS metadata. I don't thank that the instance level metadata is represented by OMS. (Joerg) this is the crux of the conversation needed with the other chairs. The OMS is conceptual without a schema and there are not enough attributes in the basic classes for translation. The OMS is a concept that allows for interoperability of representations. (Gao) where should quality and uncertainty be? (Joerg) there is a result quality somewhere, but it's not specified in detail. (Dave) At the instance level of and observation...[?]. (Gao) uncertainty can be associated with different types of processes, for example, it could be associated with the observer or in the downstream processing.... (Joerg) these concepts exist in the WMDR, most of the quality attributes exist in the equipment class which is an WMDR extension. (Gao) this looks very complete.
  • (Joerg) Can members of this team (and attendees) provide some use cases? (Dave) for Climate, the use of WMDR is clear, but the question is about observations. How to handle platforms, sensors, etc at the level of instance observations. (Joerg) we need to find one way.
  • (John) In the satellite community, if every single observation was recorded, it would massively increase the volume of data. The metadata only tells you where to go to find the values. (Joerg) in the current WMDR, none of the attributes mandatory, because it allows each section to be independently managed. In OSCAR, you can provide a full WMDR record or a subset, e.g. observation with a link to the facility.
  • (Gao) WIGOS is intended for common metadata, not each instance, correct? (Joerg) No, it should be applicable to all types of instruments. [...?...]
• reminder: Contribution of TT-WIGOS to upcoming meetings and conferences
  • TECO 2022 accepted as #140
    • Joerg presenting on evolution of WMDR
  • AGU Fall meeting
• AOB

Actions

• Anna will create a sandbox area in a fork, branch, repo to start this effort.
• Anna add hydrological to names of the terrestrial tables in fast-track branch.

Next meetings

• 2022-Sep-22 12h-13h30 UTC (re-scheduled from 29 Sep) - code amendments
• 06 Oct - standard evolution, KPIs
• 20 Oct - code amendments

Attendees

Team Members

Name	Present
Jörg Klausen (Switzerland Chair TT-WIGOSMD)	X
Tom Kralidis (Canada ET-Metadata Chair)
Gao Chen (USA)	X
Lara Ferrighi (Norway)
Rainer Maerz (Germany)	X
Shuli HAN (China)
Juan Bianchi (Argentina)
Yuanhe LI (stand in for Shuli)	X

WMO Secretariat

Name	Present
Enrico Fucile
Anna Milan	X
Xiaoxia Chen
David Berry	X
Rodica Nitu
Lize Anthonin (OceanOPS)
Johanna Korhonen
Magali Krieger (OceanOPS)
Washington Otieno

Collaborators

Name	Present
Franziska Stürzl	X
Jitze van der Meulen (KNMI)	X
John Eyre (retired from UK MetOffice)	X
Tanja Kleinart, ET-WT
Samantha Linnerts, ET-WT
Thinesh Sornalingam, ET-WT
Markus Fiebig, NILU