| Name look up :
(paste J2000 below)
Separate VLA images:
- (pop-up window)
- (in the browser)
Version 2008-Sep-26 [an error occurred while processing this directive]
NRAO VLA Archive Survey Code Page
The NRAO VLA Archive Survey
(NVAS for short) pipeline consists of some
PERL scripts that interact, using a UNIX command line interface, with
the VLA data archive and a current version of AIPS with the AIPS
procedures defined below. We are keeping the PERL scripts and local
logistical files to our selves for now, as they are mainly tuned to
our local environment to run bulk pipelines. However, the AIPS
procedures are public and summarized below. They probably will end up
in the AIPS distribution later.
When you have calibrated your data using the VLA data calibration
pipeline, or even used part of the code, it would be appreciated if
you would mention the VLA pipeline next to an
acknowledgment to NRAO
in the publication of your scientific results; e.g. "The VLA data
was calibrated using NRAO's "VLA data calibration pipeline" in AIPS
(Sjouwerman, 2006, in preparation)" [ask Lorant Sjouwerman].
On my side I would like to acknowledge the efforts of the Cast of
AIPS, in particular Eric Greisen, for making and
maintaining the AIPS-tasks and environment needed to reduce VLA data
(and any other radio astronomy data) in AIPS over the years.
The AIPS procedure files consist of three different types of
procedures; probably the most useful for the general user is the
pipeline code itself (i.e. AVLAPIPE.001
and AVLAPIPE.HLP). Consult
Chapter 12 of the
on how to use RUN files and procedures in AIPS. Essentially there are:
This is a collection of AIPS/POPS procedures to get a downloaded
archive file into AIPS and perform some checks (such as deleting
unwanted files, investigate the source list, convert to J2000 and move
away data to other user numbers). These procedures are mainly
logistical tricks for us to get the data "pipeline ready".
It is probably not too useful for the general user.
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These are the core VLA pipeline scripts, the ones that you're
probably after. They are slightly modified versions of
"VLARUN" already in the AIPS
distribution, so you can try those directly if you do not get this
download working (or if you want to skip it and start without hassle).
The HELP-file, "AVLAPIPE.HLP",
is needed as a place holder for your inputs (such as
The AIPS/POPS procedures are in "AVLAPIPE.001".
When installed correctly, (see section 3.10/3.10.2 (page 3-16/3-17) of
in the AIPS Cookbook), typing
explain avlapipe in
AIPS will give you all the help you need, that is, about this pipeline
procedure. For example, if you also download
NVASDEFS.001 in the same area and type
run nvasdefs, before typing
inputs avlapipe on a new line, it will show you
the defaults used for NVAS.
For general help on AIPS, read the
and perhaps, for synthesis imaging in general, the
proceedings/handbooks from the NRAO Summer Schools:
Synthesis Imaging in Radio Astronomy II.
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This is a collection of AIPS/POPS procedures to get a pipelined
experiment into the VLA image (and calibrated data) archive.
It is probably not too useful for the general user, maybe except
for the writing out of image and data FITS files, if you don't mind
standardized names for them.
Contact Lorant Sjouwerman
for any remarks, suggestions and/or reasonable complaints. Compliments and encouragements should
go to the division head (C. Chandler).
Thanks for using this service!
Modified on 2006-Nov-17 (text),