Changes between Version 39 and Version 40 of Stack_Sky_Levels

Timestamp:

Oct 3, 2014, 4:12:44 PM (12 years ago)

Author:

watersc1

Comment:

--

Stack_Sky_Levels

@@ -10 +10 @@
  2. There is a trend of increasing mean bias with increasing sigma.  For the compressed data, this trend is (psphot_mean - gaussfit_mean) = -0.21 + 0.01 * sigma.  The trend for the uncompressed data is (delta mean) = -0.174 + 0.009 * sigma.  The uncompressed trend is strongly influenced by outliers.
  3. Warp pixels have a narrower distribution due to the smoothing introduced in the warping process.
- 4. Stack outputs do not appear altered based on whether compressed or uncompressed warps are used as inputs.
+ 4. Stack output pixel distributions do not appear altered based on whether compressed or uncompressed warps are used as inputs.
+ 5. No background subtraction is performed on the stack pixels during the stacking process.  A background is constructed (and subtracted) during the staticsky/photometry stage, which should find and remove any residual background levels that result due to biases on the stack's input products.
 === RAW ===