N A W G ======= NRAO Algorithms Working Group Meeting - PRELIMINARY AGENDA Date: 2005-11-9 (Wednesday) Time: 1300 MST = 1500 EST Video Hub: CV-conf (others call in) Rooms: SOC317/CV311/GB241/TUCN505 Toll-Free Number for Audio-only participants: 800-619-0322 PASSCODE: 58981 LEADER: Steve Myers =============================================================================== The NAWG: I would like to invite you to attend and participate in the ninth NRAO Algorithms Working Group (NAWG) meeting on Wednesday 9 November 2005. The goal of these meetings is to have a general forum to discuss data-processing algorithms related issues of interest to scientists and software folks alike (independent of development platform or package). This is in response to the pressures of planning for the EVLA hard problems like wide-field/wide-band imaging as well as thinking about problems for ALMA and GBT. It is meant to be as observatory-wide as possible and I'm trying to solicit some participants from the various sites. These meetings are meant to be mostly informal discussion with some scheduled presentations ("Main Events") on algorithmic research and/or implementation topics. If you wish to participate and also want to speak on a topic let me know (or just show up either in person or via video/audio)! These meetings are scheduled for the 2nd Wednesday each month (in the NAUG meeting slot in the calendar). =============================================================================== Agenda: Send items for inclusion to smyers 1. Organizational issues o Jan 2006 URSI Schedule is available at: http://cires.colorado.edu/ursi/2006/program.html See sessions: Session J2 Room 265 Friday Jan 6 0820 New Interferometric Calibration Techniques Organizer: M. Wright Session J3 Room 265 Friday Jan 6 1320 Challenges and New Algorithms for Interferometric Imaging Organizer: S. Myers o Anything interesting come out at ADASS? 2. Project-related (ALMA, EVLA, GBT, VLBA, &c.) issues o NSF Software Review was held at NSF HQ in Washington, DC on Sep 27. Hopefully we can get a summary of the outcome from someone who has seen the report. 3. ***Main Event*** - Presentations and Discussion Items ******************************************************************* These talks will summarize the current state of wide-field imaging, a practical intro on how w-projection works and is implemented, and then a more speculative discussion of pushing the boundaries of interferometry to very wide fields. o W-Projection for the Rest of Us - Kumar Golap http://www.aoc.nrao.edu/~smyers/nawg/presentations/NAWG20051109-Golap-WProj.pdf o Ultra-wide field imaging - Steve Myers My musings on the issue of interferometry on the 2-sphere. http://www.aoc.nrao.edu/~smyers/nawg/presentations/NAWG20051109-Myers-UWF1.pdf o Some references W-projection EVLA memo: http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo67.pdf W-projection paper draft: http://www.atnf.csiro.au/people/tim.cornwell/wproj-paper.pdf FFTs: http://www.fftw.org/links.html FFTs on the Sphere: http://www.cs.dartmouth.edu/~rockmore/fft.html http://www.cs.dartmouth.edu/~geelong/sphere/ HEALPIX: http://healpix.jpl.nasa.gov/ Fast convolution on the sphere: http://arxiv.org/abs/astro-ph/0008227 ******************************************************************* 4. Future events (please sign up!) o George Moellenbrock - an update on frequency-dependent polcal (main) o Walter Brisken - a proposed self-cal modification (short) 5. Relevant reading: o Online Conference Proceedings: - "SKA Wide-Field Imaging Workshop", Dwingeloo, NL, 22-24 June 2005 http://www.skatelescope.org/pages/news/Wrksp20220605.htm - "ALMA and SZ", Paris, 7-8 April 2005 http://www.dstu.univ-montp2.fr/alma/sz.html - "First RadioNET Software Forum", Jodrell Bank, 1-3 March 2005 http://www.radionet-eu.org/rnwiki/ProceedingsFirstSoftwareForumMeeting o Paper & Memos: - Beyond the isoplanatic patch in the VLA Low-frequency Sky Survey (W.D. Cotton et al.) Abstract: http://link.aip.org/link/%3FPSISDG/5489/180/1 - Solving for the Antenna Based Pointing Errors (Bhatnagar, Cornwell & Golap) http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo84.pdf - EVLA and SKA Computing Costs for Wide Field Imaging (Cornwell) http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo77.pdf - W Projection: A New Algorithm for Non-Coplanar Baselines (Cornwell, Golap, Bhatnagar) http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo67.pdf - Effects of Atmospheric Emission Fluctuations and Gain Fluctuations on Continuum Total Power Observations with ALMA (Holdaway) http://www.mma.nrao.edu/memos/html-memos/abstracts/abs490.html http://www.mma.nrao.edu/memos/html-memos/alma490/memo490.pdf o Post-processing requirements: - ALMA Offline Data Processing Requirements http://www.alma.nrao.edu/development/computing/docs/joint/0018/ALMAoffline-sw-18.pdf - EVLA Offline Data Processing Requirements http://www.aoc.nrao.edu/~smyers/evla/evla_offline.pdf o GBT: - GBT Software Review Agenda & Presentations http://wiki.gb.nrao.edu/bin/view/Software/ReviewAgenda2004 - GBT Standard Observing Modes http://wiki.gb.nrao.edu/bin/view/Observing/StandardObservingModes 6. Upcoming meetings and deadlines: o 2006 Jan 4-7 URSI Meeting (w/Algorithms session), Boulder, CO ******************************************************************* o NAWG Website: http://www.aoc.nrao.edu/~smyers/nawg/ *******************************************************************