MOPEX User's Guide - IRSA

MOPEX User’s Guide
the same time, provides a guard against detecting pixels inside bright point sources as
outliers.
5.6.16 Mosaic Modules: Mosaic RMask
Command Line Equivalent: run_mosaic_rmask
Default Output Directory: /Rmask-mosaic
De pe nds On: Mosaic Outlier, Level, Mosaic Coverage
Important Notes: Setting an outlier scheme to be included in the RMasks does not guarantee that
it will be set as "fatal" when running MOPEX. You must specify the RMask Fatal Mask Bit
Pattern in the Initial Setup to correspond to the outlier rejection schemes that you want to set as
"fatal". See the Discussion below, and §8.11: Fatal Bit Patterns for more information
PURPOSE
This module combines outlier information from a choice of different outlier detection
methods into a single RMask by setting the following bits for each affected pixel: bit 0
(Single Frame Radhit detection), bit 1 (Multiframe Outlier detection), bit 2 (Dual Outlier
detection), bit 3 (Box Outlier detection). Users can choose which of the available outlier
detection schemes to include in the RMask.
INPUT
RM Thresh: (float) In most cases, the input BCD image is rotated, and its original pixel is
re-sampled to a smaller size. This implies that any final re-sampled pixel could have
fractional overlap with an original pixel. The threshold specifies the minimal fraction of an
input pixel covered by the projection of outlier pixels to be marked in the RMask (if sma ll,
outliers will be fatter). The default value is 0.3.
Bottom Threshold, Top Threshold: (float) These two values are the lower and upper
cutoffs used to select outlier pixels in the temporal rejection method. The outlier maps
produced by the Mosaic Outlier module give the deviation of each pixel from the mean of the
stack at that pixel. A pixel is flagged in the RMask when its value is less than Bottom
Threshold * sigma or larger than Top Threshold * sigma. The default values are 10 for both.
Min Coverage, Max Coverage: (int) These two numbers are used to decide which method
of outlier rejection is best for the dataset. The default values are 3 and 100.
Mosaicking (mosaic.pl) 78
Mosaic Modules