Minutes in bold

CASA/JIVE VLBI Coordination Meeting

Attendance: George, Neal, Mark, Des, Justin, Ryan, Ilse

2022 Jan 26 @ 1510UTC


  • Future Meeting dates:
    • 2022 Feb 9 @ 1500 UTC Technical meeting
    • 2022 Feb 23 @ 1500 UTC Coordination meeting
  • NB: NRAO zoom room now reserved every Wednesday (so, we are flexible for ad hoc Tech meetings or Coord scheduling adjustments):

General Admin

  • General Status w.r.t. Coronavirus measures
    • NRAO/ALMA:
      • Omicron wave peaking in USA; NRAO in North America now working at home, if possible.
      • ASTRON (and JIVE) working mainly from home.
  • Upcoming CASA Release Schedule
    • (6.4.2 reserved for pipeline flexibility)
    • CASA 6.4.3: this week
    • CASA 6.4.4: March ~1 (may slip a little to align with fiscal half-year reporting cadence)
    • Release version OS/python matrix
  • (Justin) Stakeholder prioritization
  • Documentation and related
    • (Mark) Collated requirements ( pdf)
      • Added to JIVE git repo? TBD
    • (Des/George) Fringefit memo...status? George to add some general calibration context (cf for CASA VLBI paper)
    • (Ilse) CASA VLBI Paper planning...status?
      • Last meeting: Jan 25
      • Fine-tuning content; refining CASA/AIPS comparison
      • Coordination with CASA reference paper ~on track for ~Spring submission
  • CASA repo/build logistics
    • (Ryan/George) CASA repo re-org for sunset of CASA 5 (CAS-13461)
      • remember to migrate c++ tests as needed.
    • Building c++ unit tests in CASA 6 from Darrell (CAS-13461) (still some issues with google tests?)
      • George to systematically organize calibration-related tests (mostly google tests) in synthesis/MeasurementComponents (including VLBI-related)
    • VLBI Integration Branch: TBD
    • casa6 build instructions via vmware (from Ville)
      • Need clarity on building plotms, etc., in casa6 context. (From tech mtg)
  • Misc. Admin
    • (Ryan) Anything to report on arrival of Victor Desouza? (no change to ~June arrival plans; HR handling it from here)
    • Old/stale JIRA tickets queued for disposal: George reviewing lots of old calibration tickets, looking for gems...
    • Jeff Kern (formerly CASA, SRDP) now AD for DMS
    • Josh Marvil now CASA Validation lead
  • (Ryan) CNGI/ngCASA Status? Maybe an update next meeting...
    • Demo 'release' of prototype package. CNGI info on casa webpage.
    • FYI: CNGI Development instructions
    • Some casa6 development to be considered using new technologies ("CNGI tech transition"), if adequately isolate-able.
      • Is there a tech-transfer doc materializing to guide planning of this in casa6 for 2022? See CAS-13711.
  • Meetings/workshops of relevance
    • SKA VLBI virtual meeting (2022 Feb 14-18). Ilse giving invited talk; Mark contributing on VLBI DR futures (incl. ngCASA-style technology).
  • Other admin?
    • JIVE soon to submit "Horizon 2020" proposal for tech development, possibly providing additional funding for CASA VLBI work a JIVE. May need letter of support from NRAO.


  • CASA 6.3+6.4 prioritization
  • Ongoing maintenance/development CASA 6.3/6.4 JIRA (VLBI) Status
    • Finished:
      • Mark, CAS-13622) FITS-IDI filler does not always update OBSERVATION table correctly (6.4.3)
        • Merged to 6.4.3.
      • (Mark, CAS-13628) Dysco ("lossy" compression of MeasurementSets) (6.4.3)
        • Merged to 6.4.3
    • Ongoing for 6.4.4
      • (Mark, CAS-13266) Per-scan interpolation via overloading per-obs mechanism. (6.4.4)
        • (George) Semantic adjustments nearly complete, currently verifying MS/CT mismatch logic...
      • (Des, CAS-13361) Polarization combination for fringefit. (6.4.4)
        • Refinements from prior tech meetings complete.
        • Ready for verification.
      • (Des, CAS-13056) Overlapping solution intervals (6.4.4)
        • Review by George started; probably need to better isolate from existing iteration infrastructure
      • (Des, CAS-13718) Turn on uvrange parameter in fringefit (6.4.4)
        • Ready for verification. (need a decisive dataset?)
      • (Mark, CAS-13700) Nant>255 in UVFITS export/import (6.4.4)
        • Needs validation at NRAO for AIPS compatibility...see ticket comment (26/Jan/22)
      • (Mark, CAS-13003). EOP update (6.?).
        • Anything to report?
    • Other/Miscellaneous
      • (Mark) Phase-cal measurements in MeasurementSet
        • Mark to circulate definition for MS subtable for phase-cal data to VLBA for comments (what to do with FITS-IDI content mismatches?), then introduce implementation (already mostly done) to casacore github. Deployment in CASA (i.e., using phase cal data) will be described in new CASR/CAS tickets.
      • (George/Justin) CASR-463 (TEC) Need to follow-up on Justin's initial testing, which indicated edge (near-horizon) effects, spurious but cosmetic VLA-specificity, scientific differences in details? (Also some MeerKAT testing, via Bietenholz?)
      • (George, CAS-13287) AveragingTvi2 problems for certain conditions; under separate investigation (cf CAS-13466)
      • CAS-12485: OTF weight munging for solve (Can we complete validation and deploy? Des seeking interested users at JIVE)


  • n/a
-- GeorgeMoellenbrock - 2022-01-26
Topic revision: r2 - 2022-04-19, GeorgeMoellenbrock
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