MOPEX User's Guide - IRSA

MOPEX User’s Guide
When choosing your interpolation scheme, bear in mind that each frame is overlap-corrected
by a single value for the entire frame. If speed or memory are a factor when running MOPEX
on your machine, then you may want to consider a simple interpolation scheme here (e.g.
Grid), and reserve the more complicated interpolation for the Mosaic script. The Grid option
is the default in the Overlap Pipeline for this reason.
4.3.8 Overlap Modules: Compute Overlap Correction
Command Line Equivalent: compute_overlap_correction
Default Output Directory: /Overlap_corr
De pe nds On: Initial Settings; Mosaic Interpolate
Important Notes: Running this module does not automatically apply the overlap correction. In
order to apply the correction and output the corrected BCDs, the Apply Overlap Correction box in
this module must be checked.
PURPOSE
This module computes the correction needed to set the background of overlapping images to
a constant value. Optionally, it applies the correction to the input BCD images and creates
corrected images for input to Mosaic.
INPUT
Top Threshold: (float) Number of sigma above the mean to detect outliers among the
computed offsets.
Bottom Threshold: (float) Number of sigma below the mean to detect outliers among the
computed offsets.
Minimum Number of Images: (int) Minimum number of overlapping images to perform
outlier rejection.
Use Sparse for Many Files: Turn on to use a sparse matrix solver to increase the number of
images it can solve.
Skip Bad Image Check: If no bad images, can turn this on for some speed gain.
Overlap (overlap.pl) 41
Overlap Modules