Changes between Version 38 and Version 39 of Sa10Problems

Timestamp:

Dec 11, 2012, 3:41:45 PM (14 years ago)

Author:

heather

Comment:

--

Sa10Problems

@@ -42 +42 @@
        * a.  We don't use this flag (so then why is it there?)
   * A2: 12% have ra_err > 0.1 deg (same for dec_err), and 70% have ra_err = 0 (same for dec_err) 
-     * a. This needs to be investigated 
+     * a. FOr the 12% that have raerr > 0.1, the majority come from (ng+nr+ni+nz+ny) = 0 or only a few suspect the calculation is goofy because there are few points to calculate raerr. '''(GENE??)'''
+     * a. For the 70% that have ra = 0, I did a count(*) and grouped by objInfoFlag. I repeated this for raerr!=0.  Here's what I find:  if 0x00090000 (avg position used and fitted) is not set, it has raErr = 0 (this is the majority of things).  If 0x0040000 (mean astro could not be measured) is set, may fall into either, with a preference for raerr!=0.  why do so many not have 0x00090000? are those entirely the stacks? the majority of those have a detection in a filter (for the raErr=0, and flag = 4194304).  If I do a similar query but without the restriction on flags (same raerr = 0), I find a whopping majority have NO ng/nr/ni/nz/ny, ie, they are stacks.
+       *  '''We need to make it very clear that raErr / decErr is calculated from an average of single frame detections, and may not be present at all when it is a stack with no or few single frame detetctions ''' 
   * A3: 0.1% have ndetections = -999 (one specific patch in ra & dec)
      * a. This is due to a failed batch (outside of PSPS's ra/dec range)  I thought it had been fixed (conrad?)
   * A4: ndetections still not equal the sum of ng+nr+ni+nz+ny : far from it actually. ndetections >= 2xsum (and =2xsum for 97%)
-     * a. This is a bug in the code, Heather knows where and how to fix
+     * a. '''This is a bug in the code, Heather knows where and how to fix'''
   * A5: sgsep: ranges from 0 to 181.28 [according to Nigel sgsep in object table is not correct, while in stackdetection it looks more normal)
      * a. (Gene?)