Changes between Version 1 and Version 2 of VarianceMaps

Timestamp:

Oct 5, 2011, 6:00:28 PM (15 years ago)

Author:

heather

Comment:

--

VarianceMaps

@@ -7 +7 @@
  * stack (md and sas)
 
-There are periodic patterns associated with warp and stack, which are not associated with chip.  
+There are periodic patterns associated with warp and stack weight maps, which are not seen on the chip weight maps.  
 
 Here is a zoom of one of the unconv.wt.fits for SAS footprint: (stack_Id= 336346). You can see an odd periodic background. The yellow circles are the false detections.
-
+[[Image(skycell.1316.089.336346.sas.wt.png)]]
 
 Here is a zoom of one of the unconv.wt.fit stacks for a recent MD refstack, it not quite as strange, but still, there is an underlying odd, periodic background.
+[[Image(md01.wt.png)]]
 
+Chip stage weight maps do not have this background (click to zoom in, this is for chip_id 310753 and XY53)
 
-Chip stage does not have this background (click to zoom in)
+The full chip:
 
-|| chip   || chip.wt ||
+[[Image(xy53ch310753.png)]]
+
+The weight map of one of the cells in XY53
+
+[[Image(chip.wt.png)]]
+
+The detrended fits of that same cell in XY53
+
+[[Image(chip.png)]]
 
 
 Warp stage (for the same chip) has a very strange background for the weight map (click to zoom in)
 
+One of the skycells (the weight map, same exposure, same cell, but warp stage)
 
-|| warp  || warp.wt ||
+[[Image(warp.wt.png)]]
+
+A zoom of the weight map for that cell - the background has a periodic pattern
+
+[[Image(warp.wt.zoom.png)]]
+
+And one of the warps (same cell, it looks okay)
+
+[[Image(warp.png)]]
+
+We think something weird is happening with the variance/weight maps in the warp stage - this might cause the funny false detections in the SAS.footprints, and likely causes problems elsewhere...