Index: /trunk/psphot/doc/notes.txt
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--- /trunk/psphot/doc/notes.txt	(revision 10032)
+++ /trunk/psphot/doc/notes.txt	(revision 10033)
@@ -1,3 +1,57 @@
 
+ensemble:
+
+  * first block: 
+    * select sources of interest / skip
+    * generate a guess model
+    * re-measure moments for saturated stars (MOVE)
+    * update peak position (MOVE to peaks)
+    * set the object radius 
+    * build temporary source copies (including pixels, mask, weight)
+
+  * second block:
+    * measure the cross-products and weights
+    * add to the sparse matrix
+
+  * build full-image mask
+  * measure coord weights
+  * build order elements
+
+  * solve for source amplitudes
+  * update models
+
+2006.11.16
+
+  * create psSparseBorder to solve matrix equations which have a large
+    sparse region, with a completely filled border of a smaller number
+    of rows.
+
+  * trying to modify psphotEnsemble to (1) be more general (not just
+    PSFs) and (2) fit for the sky offset.
+
+    - how is the radius for each source set?
+    
+
+2006.11.11
+
+  I am trying to define a complete set of tests to validate the
+  measurement of the photometry compared with the simulated images.
+  Part of my confusion is controlling exactly which corrections are
+  applied to the output magnitudes.  Here is the complete list:
+
+  psfMag_out = psfMag_meas + ApTrend(x,y,0.0,0.0)
+  apMag_out = apMag_meas + growth(radius,refRadius) + f(skyBias,skySat)
+
+  these corrections are modified by the following config settings:
+
+  IGNORE_GROWTH (sets all growth magnitudes to the fitMag value,
+  effectively turning off the growth correction)
+
+  APTREND : set the level of correction
+    NONE     : no correction is fitted
+    CONSTANT : just a single constant (applied to get psfMag_out)
+    SKYBIAS  : the skybias term is fitted (constant applied to psfMag,
+               slope applied apMag)
+  
 2006.11.08