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EVLA Data Post-processing

EVLA Data Post-processing. Overview Steven T. Myers AIPS++ Project Scientist. Goals. Fulfill project requirements post-processing requirements (Butler, Myers) Meet delivery schedule management plan (McMullin, Greisen) Functionality, Robustness, Usability

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EVLA Data Post-processing

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  1. EVLA Data Post-processing Overview Steven T. Myers AIPS++ Project Scientist EVLA Advisory Committee Meeting December 14-15, 2004

  2. Goals • Fulfill project requirements • post-processing requirements (Butler, Myers) • Meet delivery schedule • management plan (McMullin, Greisen) • Functionality, Robustness, Usability • integrated development & testing plan • Efficient use of resources • maximize co-development with ALMA EVLA Advisory Committee Meeting December 14-15, 2004

  3. AIPS • extensively developed & well-tested • will be used in commissioning • avoid commissioning both telescope & software! • plan: continued support + targeted development • support current VLA users • develop new functionality (e.g. auto-flagging, RFI) • support as much of EVLA processing as is practical EVLA Advisory Committee Meeting December 14-15, 2004

  4. aips++/casa • primary support for full EVLA processing • maximize co-development with ALMA • most core functions are in common • share development team & management • merge EVLA and ALMA development plans • EVLA focus on “Delta” problems • EVLA testing during development cycles • ALMA tests already use VLA data! EVLA Advisory Committee Meeting December 14-15, 2004

  5. Usability & Interface • Interface • current focus on CLI and scripting for functionality • necessary special purpose “GUI”s (e.g. viewer) only • General GUI development • defer to new Framework development(s) • scheduled for 2007 • Usability is key for EVLA user acceptance • rely on scientist input (e.g. NAUG) EVLA Advisory Committee Meeting December 14-15, 2004

  6. Problems • Difficult EVLA problems • wide-band wide-field full polarization imaging • high dynamic range high-fidelity imaging • also: RFI, pipelines • Data rates • 2008 spec 25 MB/s max (cf. VLA 0.1 MB/s) • WIDAR can produce much higher rates! • data volumes also (TB datasets) EVLA Advisory Committee Meeting December 14-15, 2004

  7. Algorithms • Algorithms group • led by Bhatnagar & Myers (formerly Cornwell) • includes AIPS & aips++/casa developers, students • NRAO-wide staff participation (e.g. NAWG) • Progress • w-projection, pointing corrections (TC, SB, KG); • autoflagging, RFI (EG, BC); pol. beam (TC,SG,KG); • RFI (TC,RP,SB,KG); MS-clean (TC,SB,KG,EG) EVLA Advisory Committee Meeting December 14-15, 2004

  8. Risks & Issues • difficult problems (e.g. wide-band MFS) • schedule (tight given current resources) • data rates & size  cluster computing? • user interface (“green hole”) • aips++ support for VLA? or EVLA only in 2007? • pipelines: afford development & ops support? • new frameworks (ACS? general? developer?) EVLA Advisory Committee Meeting December 14-15, 2004

  9. Appendix: Groups • NAUG = NRAO Aips++ User Group • aips++/casa programmers and scientific staff • currently ~1 FTE of testers (AOC & CV) • pre-testing for ALMA and EVLA • use cases and development guidance • NAWG = NRAO Algorithms Working Group • started Nov 2005, scientific staff NRAO wide • regular forum to discuss algorithm issues EVLA Advisory Committee Meeting December 14-15, 2004

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