MOPEX User's Guide - IRSA

Generated Star file: The corresponding Star file.
MOPEX User’s Guide
Generated Status List file: Lists whether each input postage stamp image was included in
the final stack and, if not, the reason it was rejected.
NOTE: If the Split By Array Position module is turned on, the output files will be replicated
for each region of the PRF Map. The output file names will have have _i appended to them
for the i th region, and the GUI will label the output with PRF#i.
DISCUSSION
This module combines the postage stamps into the final PRF. The postage stamps are
resampled and shifted to the common grid using bicubic interpolation. The stack is combined
using a simple mean, and the standard deviation is found for each pixel position. During the
processing, a variety of outlier rejection tests are applied to each point source image (see
§7.4). Only those that pass each test are included in the final stack. The output status file
describes the fate of each postage stamp.
In addition to outlier rejection, the module replaces each NaN in the input image with the
median of a number of the neighboring pixels. If Reject NaNs is greater than 0, then bad
pixels are only replaced if their number is less than or equal to Reject NaNs. Otherwise the
image is excluded from the list of images to be used for PRF estimation. Another reason for
rejecting an image is if a NaN pixel is found in the center of the input image. The size of the
center is specified with the namelist parameters Center Box X(Y), both defaulting to 7.
PRF Estimate 178
PRF Estimate Modules