Changes between Version 8 and Version 9 of IPP_Progress_Report_20110411

Timestamp:

Apr 20, 2011, 3:34:48 PM (15 years ago)

Author:

eugene

Comment:

--

IPP_Progress_Report_20110411

@@ -5 +5 @@
 
 === Eugene Magnier ===
+
+The all-sky relphot analysis of 3pi database ran for most of the week.  Despite my modifications to conserve memory used by the analysis, memory usage still made the process slow.  The data load and analysis of the zero points ran smoothly in about 7.5 hours, using a modest amount of memory.  However, at the 'update the database' stage, the memory usage jumped more than expected.  I believe this resulted in a lot of swapping, slowing down the update processing.  This stage ended up taking 5 days, but it did finally complete.  I have made an initial examination of the results (comparing the stellar locus from the MD field), and it seems to have generally done a good job of finding the calibrations (though areas with clouds and insufficient connections to photometric data can be seen).  For large areas of the sky, this database is probably good enough to start GR.
+
+While relphot ran, I also worked on psphot issues raised by Nigel M. and Michael W.V.  I found that the Kron radius was allowed to go to excessively small or large values for faint objects, so I have put in limits.  This is the cause of some of the discrepant Kron magnitudes.  I have also found that the aperture magnitudes were affected by inconsistencies in model addition/subtraction during the processing.  I also found places were some of the fit status flags were not correctly set.  I fixed this by moving the code to set the flags closer to the action to avoid interpretation errors.  I also found that the position errors were not being reported for extended non-linear fits because of a logic error, which I fixed.  
+
 
 === Serge Chastel ===
@@ -23 +28 @@
  * booked flights, hotels, and registrations for PS1SC and AAS conference 
  * worked on videophotometry stuff for pavlos - still working on it.
+
 === Roy Henderson ===