Changes between Version 9 and Version 10 of ZoologyInvestigations

Timestamp:

Aug 24, 2011, 12:05:08 PM (15 years ago)

Author:

rhenders

Comment:

--

ZoologyInvestigations

@@ -140 +140 @@
 This is AFTER I did the flag cuts.  Prior to that there were 8x as many detections, often landing on burntools and edges.
 
+Eye-balling the images confirmed that this method removed the majority of 'obvious' false detections, such as those on the edges of chips or in areas of saturation from a bright star.
+
 = Cutting using error in flux =
 
-As seen above, cutting the data using both the 'FLAGS' and 'FLAGS2' fields, and rejecting those detections labelled with obvious faults, the original total of 400,000 false detections was brought down to around 56,000, a reduction of around 86%. Eye-balling the images confirmed that this removed the majority of 'obvious' false detections, such as those on the edges of chips or in areas of saturation from a bright star.
+We looked at the error in the flux, specifically, FLUX_SIG compared to FLUX. By eliminating all detections with a an error greater than 5% of the total flux, we were left with just 2000 detections, a reduction (from 56,000) of about 96%.
 
-Next, we looked first to the error in the flux, specifically, FLUX_SIG compared to FLUX. By eliminating all those detections with a an error greater than 5% of the total flux, we were left with just 2000 detections, a reduction of about 96%.
+= Conclusions =
 
-So, by first rejecting those detections with flagged errors then further eliminating those with a high error in flux, the total of 400,000 can be brought down to 2000, a reduction of around 99%.
+ * By rejecting detections with flagged errors, the original total of 400,000 is reduced to 56,000 - a reduction of 86%
+ * By rejecting detections with an error in flux greater than 5%, the remaining total of 56,000 comes down to 2000 - a reduction of 96%
+ * This is a total reduction of around 99%