From: Robert A. Knop Jr. (robert.a.knop@vanderbilt.edu)
Date: Fri May 10 2002 - 11:47:39 PDT
> Because of the bad border contamination
> we loose about 20 to 30% of the available area.
Note that what you are saying, basically, is that the union sums are no
different from the intersection sums.
The way to scan them is to turn up your ap.sig cut to 6 or 8. Then
also bump the greyscale limits in sublineup and tiles by a factor of two
or so. I would suggest that nobody should list themselves has having
scanned the union sums without doing this-- because otherwise you've
just basically scanned the intersection sum subtraction again.
The problem is that all apsig calculations are based ont he sky noise
average for the image, which is dominated by the "good" region in the
center of the image where a maximum number of images contributed to the
sum.
Ideally, of course, we would do the sums by including the bits of
neighboring chips that overlapped this chip, thereby having greater
depth everywhere. That is much harder, however; we did what was
feasable first.
-Rob
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