Re: Data Processing Switch

[Chris Albertson <chrisalbertson90278@yahoo.com>]

There may be a mis-understanding here.  What I thought Tom
proposed to save was a FITS file with un-processed pixels
(except for trimming the overscan) and corrected values
in the header. If that's true: raw pixels and "corrected"
headers then nothing is lost.  Such files should be able
to be re-processed.

We will have to wait 'till Tom clarifies this for us by
tell us what's in the FITS files.

I read Micheal's pipeline documentation over lunch.  Looks
like he writes only the image center and image scale into
the FITS header.  I think this should be expanded to include
a full astrometric solution including the rate of change in
image scales in X and Y and rotation.  This is required for
any off-the-equator image.



--- Arne Henden <aah@nofs.navy.mil> wrote:
> Additions to Rob's comments
>    - you could find new dust donuts appearing if you don't take
>      flats every night, and need to go back to see when the
>      donut occurred and reprocess starting at that point
> My feeling is to save the raw images and discard the processed
> images after you have done the star extraction.  That way you
> save the same amount of data, but can recreate anything.
> Arne
> 
> Creager, Robert S wrote:
> > 
> >>-----Original Message-----
> >>From: Tom Droege [mailto:tdroege2@earthlink.net] 
> >>Sent: June 02, 2003 7:29 AM
> >>
> >>The proposal is to save the dark subtracted, flat fielded, 
> >>and position 
> >>corrected files which come out of Michael R's pipeline 
> >>instead.  These 
> > 
> > 
> > I would say apply the location correction to the original images,
> and keep
> > those.  I've offered to write a script that does this (take the
> pipeline
> > output and update the original FITS headers).
> > 
> > 
> >>data reduction.  There is no way to get a better flat or dark 
> >>later in 
> >>time.  I don't know what else we might want to do.
> > 
> > 
> > Sure there is.  Better reject/selection criteria of images used for
> > generating flats or darks...
> > 
> > Cheers,
> > Rob
> > 
> > 
> > 
> 
> 
> 


=====
Chris Albertson
  Home:   310-376-1029  chrisalbertson90278@yahoo.com
  Cell:   310-990-7550
  Office: 310-336-5189  Christopher.J.Albertson@aero.org
  KG6OMK

__________________________________
Do you Yahoo!?
Yahoo! Calendar - Free online calendar with sync to Outlook(TM).
http://calendar.yahoo.com