2023-12-14 Working Meeting

Meetings are public and interested parties are encouraged to attend. Meetings occur on the second Thursday of every month at the time indicated below.

Teams Link

Number: 1-833-436-1163 Meeting Code: 864 509 369#

• Laz
• Marc
• Brent
• Tim
• Todd
• Ross

• Proj:json / WKT / proj, ohh my

  • https://proj.org/en/9.3/specifications/projjson.html#introduction
  • projjson == WKT2:2019
  • projjson encodes as JSON instead of text
  • WKT vs. proj string: https://proj.org/en/9.3/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems
    • A proj string is more concise because it is (effectively) lossy compression.
  • Discussion:
    • Larger compliance with standards question. Is this all or nothing? Does ‘just’ a proj string work? Does less verbosity run into transformation issues?
    • What are we seeing in the wild?
    • If the requirement is that we want a WKT string is, we provide assistance to get from proj short string to WKT.

• Ocentric vs. Ographic Latitude discussion conclusion. What are we promoting?

  • Does it matter?
  • There is a concern that NGA might want to us an ellipsoid or triaxial ellipsoid (then lat/lons change). Then this matters.
  • For our purposes, use ocentric or ographic with a reference sphere.

• LSDI WG will start to brainstorm on data creators / products that we can solicit into the SDI.

  • Preparing to release a large quantity of Kaguya TC DTMs.
  • Awaiting feedback on QuickMap integration of Kaguya TC data.
  • No real news on LOLA lidar with other data UIs.
    • ASP can now read these for DTM derivation (standards at work!).
  • Further down the line:
    • Spectral data. These are challenging because recording uncertainties is challenging. This is orbital and ground base telescopic.
    • 1mpp SfS for Artemis sites / other lunar sites. Hopeful to be able to release via the annex. Our standards need to be finalized to make that work.
  • LMMP (in the Treks (not compliant), and in USGS archive)
  • What other mission teams are archived and could be made available?

• Action Items

  • Update docs - require projjson and/or wkt string on all data products
  • Add tutorial / links for how to go from proj short string to proper WKT string
  • Update the docs to say ocentric or ographic, use a sphere
  • NGA geoid - as it informs ocentric vs. ographic discussion
  • Email Laz - spectral data, bringing them in (partially?)

January 11 @ 2PM MST.