Changes between Version 3 and Version 4 of fullforce_algorithms

Timestamp:

Feb 7, 2014, 2:42:24 PM (12 years ago)

Author:

bills

Comment:

--

fullforce_algorithms

@@ -2 +2 @@
 
 === Inputs ===
-During the skycalibration stage of stack photometry a new fiuts table is created which contains the
-parameters to be used for forced photometry. 
+The Sky Calibration stage of stack photometry takes the cmf files for stack skycell and calibrates
+the zero point.
+
+The current version of the IPP produces a new  fits table called a '''cff''' file is created containing the
+parameters to be used for forced photometry for each object. (The cmf files are not used directly because
+they are vastly larger and would cause a much higher I/O load. 
 
 This table has one row for each source with the following columns extracted from the cmf file.
@@ -28 +32 @@
 ==========================  ===============================  =============================
 }}}
-For sources with extended fits, the FIT_GALAXY column is set and paramters from the model with
+For sources with extended fits, the FIT_GALAXY column is set and parameters from the model with
 the lowest EXT_CHISQ is chosen.
+
+=== Full Force Run ===
+A full force run consists of a cff file from a skycal run and the single frame warped images for
+the input stack's skycell filter combination. First the warps are processed by psphotFullForce and
+once they are all complete psphotFullForceSummary "summarizes" the results.
+
+=== psphotFullForce ===
+psphotFullForce is run separately for each input warp. Source detection is not performed, the
+source positions are given by the input cff file. The following psphot modules are invoked
+
+ * Model Background
+ * Subtract Background
+ * Load External Sources (read cff file)
+ * Full Force Stats - Construct sources and measurement moments and other basic stats on the supplied sources.
+ * Choose PSF
+ * Guess Models (only generates psf models)
+ * Fit Sources Linear - linear PSF fit to source peaks, subtract the models from the image (in PSF mask)
+ * Kron Flux - using supplied kron radius
+ * Petro Flux - using supplied petrosian radius
+ * Radial Apertures
+ * Galaxy Shape
+
+The output of this process is a standard IPP cff file with an additional extension called 'XGAL' which contains the
+results of the galaxy shape measurements
+
+==== Galaxy Shape ====
+The galaxy shape function takes the extended fit model parameters and creates a set of models with a range of major and model radii
+around the input values. For each trial the model is created and the chi-squared of the model versus the warp pixels
+is calculated. The results of this process are saved in the XGAL extension.
+
+=== psphotFullForceSummary ===
+