From jmcmulli@cv3.cv.nrao.edu Wed Jan 2 09:37:03 2002 Date: Tue, 1 Jan 2002 19:09:28 -0700 (MST) From: Joe McMullin To: aips2-naug@cv3.cv.nrao.edu Subject: Minutes Dec 13, 2001 AIPS++/NAUG meeting (draft) I apologize that this is going out so late. Please send any comments or corrections to the meeting minutes. Joe Next meeting of the NAUG: 16 January NAUG Time:1315 30 January NAUG/AIPS++ Time:1315 Minutes of 2001-12-13 NAUG/AIPS++ Meeting Attending: ---------- AOC: Brisken, Brogan, Chandler, Claussen, Dyer, Kemball, Marson, Moellenbrock, Myers, Owen, Taylor, Walker CV: Shepherd, Fomalont, Hibbard PA: McMullin Notes: ------ o Discussion of Release Notes. The release notes for v1.6 are available at: aips2.aoc.nrao.edu/docs/project/releasenotes16/releasenotes16.html. The NAUG was instrumental in providing information on NRAO capabilities within the system. The NAUG comments were mainly distributed into two areas: 1) What is not present (in the capabilities chapter) and a new section on Synthesis User comments. The editing/addition of the NAUG information was done by McMullin in collaboration with Fomalont/Myers. There were still reservations that the overall structure of the document was ideal (Fomalont); the NAUG will have a target to consider better organization of the user information in future release notes. In addition, more time will be allocated in the future for convergence of NAUG/AIPS++ sections. Overall, this version marks a vast improvement over previous versions of this document. o Development Plan: This is still under development. Once all items have been costed, the NAUG will be sent a version. The NAUG will have time to comment/adjust development of NRAO priorities at the same level of precedence in cases where limited resources preclude doing all items. o Discussion of the user interface survey. Roughly 15 responses had come in at that point. Once they have all been collected and collated, the results and imperatives will be posted by AIPS++. It was emphasized that this isn't the last word on interface issues. Hibbard brought up some viewer issues which weren't well addressed by the survey. There is a general consensus in the NAUG that some type of meeting between NAUG and AIPS++ viewer developers would be useful to expedite some of the changes/enhancements needed for NRAO users of this tool. Setting up such a meeting will require time as it tasks non-NRAO personnel, so the NAUG will discuss this issue, organize their suggested changes and suggest a date for such a meeting. o NAUG targets: Note: Fomalont had some changes to NAUG target lists; he will send update to McMullin. vlafillers and fits reader/writer Ed F George Done. msplot Greg T, John H George 03152 Locate function fails in most instances Resolved 2001/11/16 calibrater (polarization) Myers Myers' principle work has been on high frequency calibration this period using polarization data. calibrater (spectral line) Hibbard,Claussen Hibbard has been mainly testing bandpass corrections. He finds good point-to-point correspondance between AIPS/AIPS++ but there are amplitude differences that weren't understood. Kemball pointed out that AIPS and AIPS++ plot out the data with different conventions for normalization (1/sqrt(Jsys) vs. sqrt(Tsys)). Hibbard also wasn't sure how to use two different calibraters to get a bandpass solution. There is also a problem obtaining good solutions when there is a phase jump on an antenna. Athol clarified that this is a general problem since the least-squares fitting doesn't converge; the solution is editing the data. All of the above have been resolved. Defects: 03269 = flagging a baseline is FAR from obvious George M. 03287 = 0 based counting --together these are known as: SOMEONE NEEDS TO TELL ME HOW TO FLAG A FRIGGIN --BASELINE! Some inter-meeting discussion of this (indexing problems); Myers/Moellenbrock has provided an interim solution to this. calibrater (high frequency) Myers,Chandler Steve has a gain curve/opacity correction script; reports are logged to www.aoc.nrao.edu/~smyers/aips++/testlogs. Kumar is working on including the neutral atmosphere model from GILDAS in calibrater. There is currently no mechanism at the VLA for keeping track of this type of information (gain curves). NAUG will discuss this on their own. Claire will begin testing of the script. Defects: 03277 = plotcal needs way to id solutions George M. 03276 = interpolation across missing (bad) antennas skews fluxGeorge M. fringing and VLBI Brisken NAUG is waiting for AIPS++ action. imager(polarization) Myers Myers: No specific imager testing beyond general use for other targets. imager(multi-facets) Fomalont No work. imager(mosaic) Hibbard No work. Hibbard was mainly working on spectral line calibration this cycle. imager(single dish+array) Shepherd Debra was able to produce a final result. She uncovered a number of problems and defects. Their status is below: 03273 = image.feather doesn't regrid GBT data properly Resolved 2001/12/21 03253 = using image.imagecalc destroys unit & beam info Resolved 2001/12/19 03252 = regridding changes telescope & freq label Resolved 2001/12/18 03199 = clarify imagecalc documentation Resolved 2001/12/03 viewer Hibbard Work mainly on spectral line calibration Defects: 03286 = can't get region selection to give statistics Neil K. image analysis Hibbard No work image analysis continuum Fomalont Fomalont's work focussed on efficiency this cycle. execution efficiency bottlenecks Fomalont Fomalont finds large slowdowns. Will send scripts and quantification to Kemball/McMullin.