Re: [TASS] photometric vs. non-photometric

[Chris Albertson <calbertson@LOGICON.COM>]

Andrew Bennett wrote:
>
<snip>>

> To do this, I would need:
> 1) Raw + Dark + Flat (preferably) or processed FITS
> files for all processable images anybody is willing
> to let me have that overlap my chosen analysis areas.
> I am perfectly willing to accept somebody else's
> decision that a particular image is not processable -
> a few marginal ones would be of interest.
> 2) Information as to precisely where the image is on
> the sky - I gather from previous posts that this may not
> be written back to the processed FITS header and is
> probably pretty rough in the raw FITS files. The last
> time I tried to locate somebody else's image, the
> software threw a tantrum ... announced you couldn't get
> there from here and gave up.
> 3) Lots of help when I start finding what the real
> problems are.

Asking for FITS image data by _location_ in the sky would
require someone to do a lot of work.  There is however a
way to figure out the list of filenames to ask for from the
TASS database.

Every data point in the database has stored with it, along
with the magnitude and ra and dec a "frame ID"  This ID can
tall you exactly which FITS image file the data point came
from.  You can ask the database for all data within a small
patch of sky then to track down the FITS filenames from each
point then reduce the list to unique filenames.  You should
be able to craft a SQL statment to do the above.
The filenames have the site ID as part of the name so you can
know who to ask for the data.

My guess is that everyone has kept thier image files and if you
could ask for a few files by filename you would get them.  But
if you asked me for "Any data that covers a square in the sky
bounded by blah, blah..." it would be a long time before I'd get
around to hunding down the data.  Others who by now have thousands
of images couldn't do the job manually.

--
  Chris Albertson

  calbertson@logicon.com                  Voice: 626-351-0089  X127
  Logicon, Pasadena California            Fax:   626-351-0699