[News] sub window statistics

[Juan Alcala]

Hi Ewout,

> Our worry is that with this subwindow size, large scale (flat-field)
> effects and stars may be a factor within the subwindows.

 by "factor" do you mean an "issue" ?
 if this is what you mean, for flats that should not be an issue because
 as it was stated some time ago, OmegaCam will not have such effects on
 that scale size. Stars might be an issue in very crowdded fields, but skyflats
 will not be crowdded, right ?

> Additionally when the idea is to characterize the CCD images by a
> reduced number of numbers, 32 subwindows may be counter productive,
> complicating things rather than simplifying them.

 I onestly do not understand what you mean here.
 do you mean that 32 x 4 numbers is too much for the DB ?

> We could use smaller and fewer windows, for example:
>
> B) 8 subwindows NOT covering the entire CCD. Windows are 50x50 pixels in
> size.

 50x50 pixels leads to poor statistics and in this case stars may be an issue
 if, by chance, they fall in one of these small windows.
 how do you plan to distribute these small windows within the CCDs ?

 cheers,

 Juan M.