Re: Status Report for March 2003

[Tom Droege <tdroege2@earthlink.net>]

Andrew and all,

Wow!  Someone actually looked at an old TN and asks an interesting question.

Michael allows fitting a 0, 1, or 2nd order surface to the data.  I use 
only the first order.  I think this does not bother a nice star field.

I have looked at lots of fields.  DS9 has a feature that allows taking N-S 
or E-W sections through the image.  The way I set up the cuts, this these 
sections are either flat within the noise, or I throw the image away.  So 
far, I have not seen it throw away a good image that just had 
stars.  Clouds are another matter.  I can set the cloud tolerance very 
tight and eliminate any image where there is a visible change in cloud 
density over the image.  I can still keep images with uniform thin clouds.

I am running a test now to see if I want to keep images with uniform thin 
cloud cover.  We shall see.

Tom Droege

At 11:06 PM 4/1/03 +0100, you wrote:
>On Tue, 01 Apr 2003 07:04:27 +0000, Tom wrote:
>
> >Michael has improved the pipeline software.  One can now set sky level and
> >sigma for rejection of further processing.  The software also flattens the
> >image.  The result is that the image can be set to be flat within the
> >noise, or is rejected.
>
>What would this do with images such as that of TN21?
>
>Andrew Bennett, Avondale Vineyard