MOPEX User's Guide - IRSA

MOPEX User’s Guide
if the number of negative pixels N- in a cluster with N pixels is smaller than the threshold
N- / N < Threshold Ratio,
then their signs are flipped. If the number of positive pixels N+ in a cluster with N pixels is
smaller than the threshold
N+ / N < Threshold Ratio,
then their signs are flipped. If Threshold Ratio = 0.5, which is the default, the sign of pixels
within each cluster will be determined by the majority of the pixels. The products of this step
are the corrected dual detection maps.
5.6.14 Mosaic Modules: Mosaic Outlier
Command Line Equivalent: run_mosaic_outlier
Default Output Directory: /Outlier-mosaic
De pe nds On: Mosaic Interpolate
Important Notes: Using this module does not mean that MOPEX will automatically use the
results for outlier detection. In order to use the results from this module, you must set Use
Outlier For Rmask in the Mosaic RMask module and set the RMask Fatal Mask Bit Pattern in
the Initial Setup module to use bit 1. Note that this is not the same as setting it to a value of 1. See
§8.11: Fatal Mask Bit Patterns for more information.
PURPOSE
This module uses the Multiframe Temporal Outlier rejection method (see §8.2.2). For a stack
of input images with good coverage, the mean and sigma at each pixel on the sky are
computed. Pixels outside an asymmetric sigma envelope are flagged as outliers. If the data
have good coverage (>10), this is the best option for finding outliers. For very shallow
coverage, this method will not work well.
INPUT
Bottom Threshold: (float) Specifies the upper envelope in sigma to identify outliers from the
pixel stack. Default value is 3.0.
Top Threshold: (float) Specifies the lower envelope in sigma for selecting outliers.
Mosaicking (mosaic.pl) 74
Mosaic Modules