Temporal DWG Workplan

Following the publication of the Abstract Conceptual Model for Time (OGC23-049r2), it is envisaged that the Temporal DWG will work on devising and publishing Best Practices.

• Register Temporal Coordinate Reference Systems with the OGC Naming Authority

  • Add 360Day year as Temporal CRS
  • Add T-/+dd as “countdown” Temporal CRS, in seconds, days, etc “Countup” too
  • Refine TCRS Q/C form

• Register some Calendars with the OGC Naming Authority

  • Put Gregorian DateTime as separate (Calendar?) branch in NA register
  • Refine TCRS Q/C form

• Develop Best Practice

  • Use RFC3339 restrictive profile of ISO8601-1 for timestamps
  • Use ‘Z’ for timestamps on persistent resources. Time zone shifts belong in clients
  • Temporal CRSs and Calendars are different things. Notation is neither.
    • In particular, xsd:DateTime is not a proper CRS
  • Moving Features, especially fast ones, should have their own clocks/time
  • Calibrating, synchronizing and coordinating clocks and timescales. Important for precisions below a minute, down to nanoseconds.
    • Trawl NGA/DoD Imagery Handbook Chapter 6 for best practices
  • Timescales and Timelines should be monotonic and continuous

• Collaborate with ISO TC154 and TC211 on Calendars, CRSs, Notations, Vocabularies and Models • Form views on EDTF, IETF RFC3339, ISO 8601-1/2/3, and revisions • Collaborate over Planetary and Outer Space Coordinate Systems • Moving and Dynamic Features? • GeoPose? • Implementation standards?? • Anything else??