Changes between Version 8 and Version 9 of staticsky.20120706
- Timestamp:
- Dec 8, 2012, 11:26:26 AM (14 years ago)
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staticsky.20120706
v8 v9 35 35 == Sky calibration status == 36 36 37 The plot below shows the number of detections per skycell (log scale) for the region 267 < RA < 303. The data for 10 < DEC < 20 is still processing37 The plot below shows the number of detections per skycell (log scale) for the region 267 < RA < 303. 38 38 [[Image(logdetections.jpg)]] 39 39 40 40 == False Detections from y band stacks == 41 We have noticed that some skycells are getting large numbers of matched detections. These are caused by false detections in the y band. 41 42 We have noticed that some skycells are getting large numbers of matched (forced photometry) detections. 43 These are caused by false detections in the y band. Recall that forced photometry is performed for all y band sources 44 that are not matched with a detection in another band while detections for the other filters must match 2 other bands 45 before forced photometry is done. 46 42 47 If we plot the ratio of the number of matched detections to the number of detected sources for each band we can see these outliers. 43 48 The following plots shows the ratio for the r band versus that in the ratio in i band for each stack. The plot on the left shows the full range … … 50 55 51 56 We propose re-running psphotStack for these skycells changing the rule that matched detections are created for all unmatched y band 52 detections if some criteria is met. We can get rid of most of worst of the outliers with the cut 57 detections if some criteria is met. We can get rid of the worst of the outliers with the cut. This effect is seen in 3% of the skycells 58 north of 20 degrees declination 53 59 {{{ 54 60 Nmatched_i / NDetected_i > 0.4 && Nmatched_r / NDetected_r > 0.6
