[daip] Quick question -- how to display an image
Eric Greisen
egreisen at nrao.edu
Mon Dec 3 12:19:43 EST 2007
Bryan E. Penprase writes:
> Just for your information-- I have been reading this cookbook for hours
> and have read those chapters multiple times. So have two of our
> students, and our UNIX system administrator. I am not exaggerating when
> I say that I have had nightmares about this data reduction. Many of them.
I am suprised and disappointed that you find this so hard. That
does not seem to be the usual experience.
>
> This documentation (Cookbook + manual) is not easy to use for a
> beginner. It would be helpful to get a bit more information which would
> include some of the input values to use, and what specific steps are
> needed to make an actual FITS image which can be viewed with a FITS
> viewer such as DS9. This was the question I was asking and can't seem to
> find an answer.
We do avoid giving actual values, because then the users will use
those values even if they are totally inappropriate. The CookBook is
to be read in order and chapters 2 and 3 probably have to be
understood before anything else will make much sense. Also
interferometry needs to be understood before a task like IMAGR will
make sense. There is a procedure called MAPPR mentioned in the
CookBook which provides a simplified interface to IMAGR for simple
imaging - but no interferometric imaging is completely simple.
>
> I have read the section of FITTP in the cookbook which describes how to
> write the images to tape. This is not what I am trying to do!
Try reading the inputs and help for fittp. The cookbook also
makes it clear that you can write disk images with fittp. For URANUS
try
task = 'fittp'
default
indi 1
getn 15
outfile 'URANUS.fits
go
Note that there is not close quote on the outfile line. This lets the
file name be lower case ...fits which should help with ds9 and other
fits viewers.
Eric Greisen
>
> I have read, and re-read the sections on IMGR and find the many layers
> of parameters extremely confusing. The few times I have tried IMGR I
> have just gotten cryptic error messages. We just need a specific set of
> parameters which make sense and which can provide our students with some
> chance of viewing the images they took as part of the NRAO undergraduate
> radio astronomy program.
>
> We have spent probably 100 hours on this reduction so far and only have
> a list of "image files" which are on the disk. This list is below. All I
> want to do is convert these images which were converted with VLARUN into
> something that can be viewed with a FITS image viewer such as DS9. I
> just want a quick look so I can go over our results with the class.
>
> Can someone help me with this? I would be happy to discuss this on the
> phone with someone, and I think I need some help to make our radio
> astronomy exercise a valuable one for us. I appreciate the help we have
> received so far, and would like to get to a point where we can see what
> our data has produced!
>
> Thanks very much for any information,
>
> Bryan
>
> Below is our image catalog:
>
> >mcat
> AIPS 1: Catalog on disk 1
> AIPS 1: Cat Usid Mapname Class Seq Pt Last access Stat
> AIPS 1: 13 2 0137+331 .ICL001. 1 MA 28-NOV-2007 21:36:20
> AIPS 1: 14 2 2323-032 .ICL001. 1 MA 28-NOV-2007 21:39:03
> AIPS 1: 15 2 URANUS .ICL001. 1 MA 28-NOV-2007 21:41:29
> AIPS 1: 20 2 0137+331 .ICL001. 2 MA 28-NOV-2007 22:41:57
> AIPS 1: 21 2 0334-401 .ICL001. 1 MA 28-NOV-2007 22:43:55
> AIPS 1: 22 2 NGC1316 .ICL001. 1 MA 28-NOV-2007 22:48:30
> AIPS 1: 30 2 0137+331 .IBM001. 1 MA 28-NOV-2007 22:51:01
> AIPS 1: 31 2 0137+331 .IBM002. 1 MA 28-NOV-2007 22:51:07
> AIPS 1: 32 2 0137+331 .IBM003. 1 MA 28-NOV-2007 22:51:15
> AIPS 1: 33 2 0137+331 .IBM004. 1 MA 28-NOV-2007 22:51:22
> AIPS 1: 34 2 0137+331 .IBM005. 1 MA 28-NOV-2007 22:51:37
> AIPS 1: 35 2 0137+331 .IBM006. 1 MA 28-NOV-2007 22:51:48
> AIPS 1: 36 2 0137+331 .IBM007. 1 MA 28-NOV-2007 22:52:00
> AIPS 1: 37 2 0137+331 .ICL001. 3 MA 28-NOV-2007 22:52:22
> AIPS 1: 38 2 0137+331 .ICL002. 1 MA 28-NOV-2007 22:52:41
> AIPS 1: 45 2 0137+331 .IBM001. 2 MA 28-NOV-2007 23:01:30
> AIPS 1: 46 2 0137+331 .IBM002. 2 MA 28-NOV-2007 23:01:35
> AIPS 1: 47 2 0137+331 .IBM003. 2 MA 28-NOV-2007 23:01:40
> AIPS 1: 48 2 0137+331 .IBM004. 2 MA 28-NOV-2007 23:01:43
> AIPS 1: ** press RETURN for more, enter Q or next line to quit print **
> #
> AIPS 1: 49 2 0137+331 .IBM005. 2 MA 28-NOV-2007 23:01:49
> AIPS 1: 50 2 0137+331 .IBM006. 2 MA 28-NOV-2007 23:01:55
>
>
> Eric Greisen wrote:
> > Bryan E. Penprase writes:
> >
> > > Thanks for the tips. We will try and pore over what you have said.
> > >
> > > Short of getting the TV service to work, is there an easy way to convert
> > > these images to FITS files so we can view them with another TV viewer?
> > >
> > > If you can give us easy steps for this it would be extremely helpful.
> > >
> >
> > May I suggest that there is documentation for such questions. The
> > aips CookBook is straightforward - chapters 2 and 3 cover basics.
> >
> > You can write the images out with FITTP.
> >
> > Eric Greisen
> >
> > -------------------------------------------------------------
> > This message has been scanned by Postini anti-virus software.
> >
> >
>
> --
> ------------------------------------------------------------
> Dr. Bryan Penprase
> Chair, Dept of Physics and Astronomy at Pomona College
> 610 N College Ave, Claremont, CA 91711
> Director, Frank P. Brackett Observatory
>
> =========================================================
> penprase at dci.pomona.edu (909) 621-8727
> bpenprase at pomona.edu (909) 621-8463(FAX)
> http://www.astronomy.pomona.edu
>
>
> -------------------------------------------------------------
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