Changes between Version 5 and Version 6 of Stack_Sky_Levels

Timestamp:

Aug 28, 2013, 6:07:47 PM (13 years ago)

Author:

watersc1

Comment:

--

Stack_Sky_Levels

@@ -1 +1 @@
 == 2013-08-28 ==
 
-As the statistics and fitsio both seem to be working as expected, I began looking through the ppStack code to attempt to identify an issue there.  It appears that the important sequence in the code is as follows:
+As the statistics and fitsio both seem to be working largely as expected, I began looking through the ppStack code to attempt to identify an issue there.  It appears that the important sequence in the code is as follows:
  1. Input images are matched against the target PSF, and convovled to match that target.  
  2. After convolution, a single ROBUST_MEDIAN background level is subtracted from the convolved images.
@@ -17 +17 @@
 Unconvolved:
 [[Image(ninput_unconvolved_check.png,400px)]]
+
+From the behavior of the convolved stack background levels, it appears that there is a small statistical issue remaining, on the order of 0.25DN/input (0.5DN/input in y?).
 == 2013-08-27 ==