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Rational for WMDR2

The standard underpinning WMDR1.0 is ISO 19156:2011/OGC O&M. This standard is superseded by ISO19156:2022/OGC OMS. It is not impossible to continue with O&M for now, but it is unclear, how long the relevant XSD for O&M will still be maintained. Moreover, it is poor practice to rely on a canceled standard for an international exchange format.

Use cases or user feedback stating shortcomings of WMDR1.0:

• https://github.com/wmo-im/wmdr/issues/39, https://github.com/wmo-im/wmdr/issues/48
  • WMDR1.0 only supports one schedule, which leads to confusion and does not permit to distinguish between schedule of observation, schedule for national reporting and schedule or international reporting
• https://github.com/wmo-im/wmdr/issues/44
  • Use of ObservedLayer currently not possible
• https://github.com/wmo-im/wmdr/issues/43
  • Specification of wavelengths similarly to frequencies for remote sensing instruments
• https://github.com/wmo-im/wmdr/issues/38
  • Specification of WMO RA for contacts not possible but useful / necessary for further downstream services.
• https://github.com/wmo-im/wmdr/issues/37 (issue deals specifically with vertical extent of observation and related instrument capabilities)
  • Specification of instrumentation is relatively basic on not formalized at present. This will present a road block for gap analysis in future applications of metadata.
• https://github.com/wmo-im/wmdr/issues/32
  • Cardinality for GeopositioningMethodType is 0..1 at present, ignoring the possibility of using several. Cardinality needs to be extended to 0..*
• https://github.com/wmo-im/wmdr/issues/31
  • The element officialStatus, presently under 'Reporting' in the WMDR1.0 is inconsistent with WMDS element 5-14 (ObservationStatus). A solution has been proposed by the former TT-WMD to create an element observationStatus under 'Deployment' of type ObservationStatusType (existing http://codes.wmo.int/wmdr/ObservationStatus) but this also requires a change of the model.

In addition, the current WMDR1.0 is specified exclusively as an XML Schema Definition (XSD) with a specification document along with it.

• Nilu/EBAS use cases