Re: [TASS] photometric vs. non-photometric

[Chris Albertson <calbertson@LOGICON.COM>]

Stupendous Man wrote:


>   A better idea is to have a VERY simple program scan each new image
> and look for "cloudiness" -- Peter McCullough finds that Stardial
> images during cloudy weather are easy to distinguish from those taken
> during clear conditions, by several metrics.  If any image shows
> hints of "cloudiness", then declare the night "not photometric".
>
>   One might consider classifying two halves of the night (early and late)
> separately, or even each hour .... but that's overkill, to my mind.

Sometime when you have a computer "overkill" is easyer than then doing
what would seem easy.  If Peter McCullough has a method that can look at
one image and determine if the conditions are "photometric" or not why not
feed _every_ image into his precedure?  Yes it may be overkill but the
other option is to write yet another procedure that decides which images
to evalutate.  Easyer to simply evaluate them all.
If you evaluate all images then you can switch programs after say,
three images in a row tell you than condidtions have changed.
This shouln't be too out of line.  I think everyone want's to move
toward real-time data reduction.  Maybe in a year or so.  Until then
maybe we can use some kind of manual switch
>
>                                           Michael Richmond

--
  Chris Albertson

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