Re: Data sets over time

[Chris Albertson <chrisalbertson90278@yahoo.com>]

I agree with Rob.  I hope the headers contain usful data.
But isn't this already done?  I thought it was.

What's needed is a table with one row for each FITS file.  The
data in that row would descibe the image and would include the
vield of view and time of day and oher date derived from the
headers.  

Then there is another table that contains photometric data points
that were produced by the pipeline.  I assume each data point has
a "pointer" the the above table so you can tell from where that
point came from.

Databse designs dating from the Mk III era contained at least both of
the above tables.
Given that nothing has changed, to make the time series
you first select the set of points that are within the RA,DEC boundry
and times of interrest (Say the "galatic center in the last two years')
and then you ask the databse for the unique list of filename
pointers for those points.  So, the existing database should be able
to supply the list of FITS files needed.

Tom would still have to figure out which CDs to pull from the
list of filenames.  Is this a big problem?  I don't know.

Writting a script is not hard - gettig the requiremnets nailed
down is hard.



--- Robert Creager <Robert_Creager@LogicalChaos.org> wrote:

> When grilled further on (Wed, 15 Sep 2004 12:56:06 -0500),
> "Thomas Droege" <tdroege2@earthlink.net> confessed:
> 
> > To set up a data base, the only way to get the information is to
> read each
> > fits header from each disk.  So this involves loading 2500 or so
> CDs,
> > reading the headers and making up the information for the data
> base.  While
> > at it, one might as well invest in a stack of hard disks and load
> the
> > images.  Then one could extract images from such a file.  There are
> a some
> > of tests I would like to do by processing at one time all the
> images
> > containing a particular star or region of the sky.
> 
> Are the headers updated after the reductions are done, or are the
> headers real,
> real accurate?  If not, then doing this will not be of much value.  I
> suspect
> Michael R. can answer this question?
> 
> Cheers,
> Rob
> 
> -- 
>  12:18:54 up 10 days, 23 min,  4 users,  load average: 2.38, 2.28,
> 2.20
> Linux 2.6.5-02 #8 SMP Mon Jul 12 21:34:44 MDT 2004
> 

> ATTACHMENT part 2 application/pgp-signature 



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


		
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