From jwf@ipac.caltech.eduTue Mar 25 09:38:05 1997
Date: Wed, 12 Feb 1997 18:11:27 -0800
From: jwf@ipac.caltech.edu
To: 2mass@ipac.caltech.edu
Cc: chas@ipac.caltech.edu, sstrom@ipac.caltech.edu,
stiening@ipac.caltech.edu
Subject: WG Mtg #115 Minutes
IPAC 2MASS Working Group Meeting #115 Minutes
2/11/97
Attendees: R. Beck, T. Chester, R. Cutri, T. Evans, J. Fowler,
L. Fullmer, T. Jarrett, G. Kopan, H. McCallon,
B. Wheaton, S. Wheelock, J. White
AGENDA
1.) Status Reports
DISCUSSION
1.) Status Reports
A.) R. Beck
Software deliveries were processed and pipeline tests were run.
B.) R. Cutri
The telescope optics are due to be installed about now. First
light is expected 2/17. The 2MAPPS runtimes are about double their
FDD guidelines.
C.) T. Evans
MAPCOR liens at this point include checking all output for bugs
and input parameter optimization. Statistical and quality output
are currently being added. Work is underway on tracking down bugs
in the pipeline output. Work on DBMAN has begun.
D.) J. Fowler
The DARKS code and SDS have been modified to implement changes
suggested by M. Skrutskie and E. Howard. PFPrep has been modified
to limit the number of FREXAS detections per frame on the basis of
brightness so that the brightest detections will be used and no
panel bias will be introduced. BANDMERGE statistical processing
design has been finished and coding is underway.
E.) L. Fullmer
CONMAN was redelivered with more match statistics. Plots of these
statistics have brought to light a precision problem in another
subsystem. Investigation is still underway concerning the validity
of some extractions that look like they may be "split".
F.) G. Kopan
A new noise estimator was implemented in the PIXPHOT find step.
Bugs were fixed in PIXPHOT and FREXAS. An investigation is
underway of the PIXPHOT FIND completeness vs. FWHM. Work was done
in support of the survey scheduler design and the survey database
manager design, including creation of the first version of
database manager SIS srv01.
G.) H. McCallon
I. PFPrep Status:
1) Changes were made to eliminate system sort on very large
files; the system sort uses scratch disk space and could
cause problems in high-density fields if insufficient disk
space were available. PFPrep now uses an index sort which
requires much less space and is done in core; this is both
safer and faster.
2) Changes were made to limit number of Read2-Read1
extractions per frame based on magnitude sort.
3) All stop statements have been replaced with exit calls.
II. PosFrm Status:
1) Capability to use the samples of real Tycho data has been
added.
2) Efficiency of position matching has been improved.
3) All stop statements have been replaced with exit calls.
4) A number of the routines borrowed from SlvAll (in the
haste to have something pipeline-ready for the Dec. 3rd
delivery) have been rewritten for maximum robustness and
maintainability; many more to go.
H.) S. Wheelock
CALMON:
Version 0.40 of CALMON was delivered Feb 5. This version has
the major functionality of CALMON to determine the zero
point via a nightly average or linear fit based on RMS
values. The 4-hour fit is computed, but the logic concerning
when to use it is TBD. Some major SIS changes occur with
this delivery. Standard Star files now carry a version ID to
assist in distinguishing which set of standards for a field
were used in determining calibration. The calibration
parameter file cal03 contains more information regarding the
nightly calculations. Additional information includes which
algorithm was used in determining the scan zero point and
which standard star file was used.
SMERGE:
Utility SMERGE was modified to work with 3-channel data and
used in the C&R analysis described below.
C&R:
The internal completeness and reliability analysis for k
band only using calibration scans 022-027 is complete. The
results are encouraging for the 2MAPPS processing but do
highlight some processing problems which are stated below.
In addition to the internal scan-to-scan C&R analysis, all
6-times-confirmed sources from the 2MAPPS processing were
matched with 6-times-confirmed sources from the protocam
data as well as the deep field coadd created by Roc. All
non-matches were examined. All problems found in this
analysis have been passed on to the responsible party.
Problems found in performing this analysis are as follows.
Sources that fell at the end of descending scans and
within the short coadd were missed.
Some sources that were 6-times-confirmed in the
protocam processing had psfmag=99.9 in the 2MAPPS
processed data.
One source appears to have been inappropriately
band-merged.
Many R1 single detections occurred at faint R1
magnitudes.
Some sources had multiple detections within a single
scan.
I.) J. White
Worked was done on compression and cascading. No final decision
has been made regarding its use. The reduced total cost of tapes
may not be cost effective compared to implementation and
maintenance cost. TAPELOAD was delivered as is; it is still not
unit tested and needs observatory data. COPYCAT (raw disk to tape)
was delivered as is; it is still not unit tested and also needs
observatory data. RDFRAME was redelivered with a new center frame
computation EQSPDX subroutine from H. McCallon. A minor change to
Obs/IPAC I/F Document Rev J was requested: add Scan Direction to
par file. A couple of suggestions regarding new fields added by
the observatory were passed along to Mike Rudenko.