Changeset 9633 for trunk/Ohana/src/relphot/doc/notes.txt

Timestamp:

Oct 18, 2006, 8:54:26 AM (20 years ago)

Author:

eugene

Message:

work to allow REF measurements in the solution

File:

• trunk/Ohana/src/relphot/doc/notes.txt (modified) (1 diff)

trunk/Ohana/src/relphot/doc/notes.txt

@@ +1 @@
+
+2006.10.17
+
+  I am working on a partial upgrade of relphot to handle more general
+  problems than I have treated in the past.  In particular, I would
+  like to be able to have it assign the average magnitudes, regardless
+  of whether any or all images and/or objects are well-treated for
+  relative photometry.  In fact, I would like it to be able to
+  determine average magnitudes even for sources which have only
+  externally supplied data, and thus have no matching images.  I would
+  eventually like to have more flexibility about the filtering which
+  is performed on the measurements to determine the average
+  magnitudes.  Some of this work will require a bit of a more careful
+  treatment of the process.  
+
+  At the moment, we can consider the relphot process to consist of the
+  following steps:
+
+  1) load the complete catalog data
+  2) select a subset of the sources:
+     - appropriate photcode (equiv == selected photcode)
+     - in time range, if specified
+     - appropriate dophot type, if specified
+     - bright enough:
+       - mag < MAG_LIM  
+       - dMag > SIGMA_LIM
+       - ImagMin < iMag < ImagMax
+     - other restrictions
+       - within valid image region for chip
+  3) iterate to a solution for Mcal (image offsets)
+     - mark specific images as bad
+     - mark specific sources as bad
+     - mark specific measurements as bad
+     - include desired restrictions on Mcal (eg, all chips of mosaic
+       matched)
+     - only keep the image offsets
+
+  4) if the results are to be kept, recalculate the average magnitudes
+     using the image exclusions and Mcal values determined above 
 
 2006.05.03