MOPEX User's Guide - IRSA

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MOPEX User’s Guide Multiframe Comparison of Detection Maps The comparison is performed by the Mosaic Dual Outlier module. The input parameters that are used are Max Outlier Image and Max Outlier Fraction. Interpolated detection maps are stacked up. For each stack, the number of spatial outlier pixels is found. If the fraction of outliers in the stack is smaller or equal to Max Outlier Fraction and the number of spatial outliers in the stack is smaller or equal to Max Outlier Image, then these pixels are now classified as dual (spatial and temporal) outliers, and the sign of the dual outlier pixe ls is changed. For example, in Figure 8.8, suppose Max Outlier Fraction = 0.5 and Max Outlier Image = 3. Stack A is the perfect case when only one pixel in the stack is a spatial outlier (value of -12). Its sign is changed from positive to negative. Stack B has 4 pixels that are spatial outliers (1, 12, 5, 8). The fraction of spatial outliers is 0.4 < Max Outlier Fraction, but 4 > Max Outlier Image, so since the stack does not satisfy both conditions, their signs are unchanged and remain positive. In Stack C the fraction of spatial outlier is 0.6 > Max Outlier Fraction, so the signs remain unchanged. Stack D is the perfect case of a pixel in a point source detected in all overlapping images. The fraction of spatial outliers is 1. The products of this step are dual detection maps (see Figure 8.9). Figure 8.8: Suppose Max Outlier Fraction = 0.5 and Max Outlier Image = 3. Stack A is the perfect case when only one pixel in the stack is a spatial outlier (value of -12). Its sign is changed from positive to negative. Stack B has 4 pixels that are spatial outliers (1, 12, 5, 8). The fraction of spatial outliers is 0.4 < Max Outlier Fraction, but 4 > Max Outlier Image, so since the stack does not satisfy both conditions, their signs are unchanged and remain positive. In Stack C the fraction of spatial outlier is 0.6 > Max Outlier Fraction, so the signs remain unchanged. Stack D is the perfect case of a pixel in a point source detected in all overlapping images. The fraction of spatial outliers is 1. Basic Concepts in MOPEX 188 Out lier Det ect ion
MOPEX User’s Guide Figure 8.9: As a result of temporal detection, the sign of the pixels of clusters 3 and 4 has been changed. Also some of the pixels of cluster 2 have their sign changed. Cluster 5 is probably a moving source - the spatial detection suggests that it is real, but the temporal detection shows that it is no longer at the same coordinates in subsequent frames. One of the pixels in cluster 5 has its sign unchanged. This could happen if an overlapping frame has a radhit affecting the corresponding pixel. Dual Detection Map Correction The processing is done by the Level module. The dual detection map is processed in order to eliminate detection of the outskirts of legitimate point sources as dual outliers. If a dual outlier belongs to a cluster where the majority of pixels are not dual outliers the chances are the pixel has been wrongly marked because it is on the edge of the point source. The sign of wrongly marked pixels is flipped based on the namelist parameter Threshold Ratio. If the number of negative pixels N- in a cluster with N pixels is smaller than the threshold N − N < Threshold _ Ratio Equation 8.2 then their signs are flipped. If the number of positive pixels N+ in a cluster with N pixels is smaller than the threshold Basic Concepts in MOPEX 189 Out lier Det ect ion
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MOPEX User’s Guide MOsaicking and
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MOPEX User’s Guide Chapter 4. Ove
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MOPEX User’s Guide 7.4 PRF Estima
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Chapter 1. Introduction MOPEX User
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MOPEX User’s Guide • If you are
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for Linux and Solaris systems, and:
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Chapter 2. Overview of MOPEX MOPEX
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For instructions on how to run MOPE
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2.3.1 Additional Functionality MOPE
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MOPEX User’s Guide mosaic_mask.pl
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MOPEX User’s Guide Choosing the r
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MOPEX User’s Guide photometry), o
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Chapter 3. MOPEX Input MOPEX User
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3.2 MOPEX Input List Files MOPEX Us
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Chapter 4. Overlap (overlap.pl) MOP
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MOPEX User’s Guide 3. Background
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MOPEX User’s Guide Output Directo
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ncpu_multiprocess = 1 default = 1 I
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4.3.3 Overlap Modules: S/N Estimato
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σ = σ 2 readnoise g 2 + σ 2 conf
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MOPEX User’s Guide Generated Head
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OUTPUT MOPEX User’s Guide Generat
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OUTPUT MOPEX User’s Guide Generat
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MOPEX User’s Guide When choosing
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MOPEX User’s Guide offsets and th
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Chapter 5. Mosaicking (mosaic.pl) M
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MOPEX User’s Guide They do not ne
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MOPEX User’s Guide interpolated u
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MOPEX User’s Guide more informati
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MOPEX User’s Guide Pixel by Size:
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OUTPUT None DISCUSSION MOPEX User
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MOPEX User’s Guide This module al
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MOPEX User’s Guide negative numbe
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DISCUSSION MOPEX User’s Guide For
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MOPEX User’s Guide then interpola
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MOPEX User’s Guide This module pe
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DISCUSSION MOPEX User’s Guide Mos
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PURPOSE MOPEX User’s Guide This m
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DISCUSSION No further information.
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MOPEX User’s Guide processed in o
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MOPEX User’s Guide Min Pix Number
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MOPEX User’s Guide Box Median Bia
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MOPEX User’s Guide If coverage >=
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MOPEX User’s Guide Refine Outlier
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MOPEX User’s Guide Reinterpolatio
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PURPOSE MOPEX User’s Guide The in
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MOPEX User’s Guide The tile speci
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MOPEX User’s Guide Standard Devia
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Mosaic Coverage File (mosaic_cov.fi
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There are no user-defined input par
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COMMAND LINE INPUT See INPUT. OUTPU
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MOPEX User’s Guide limitations di
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6.3 Running APEX MOPEX User’s Gui
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MOPEX User’s Guide Point Source D
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Figure 6.1: Overview of the main pr
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Relevant Pipelines: All PURPOSE INP
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NICE = 1 save_namelist = 1 MOPEX Us
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MOPEX User’s Guide Mosaic PRF Fil
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create_unc_mosaic = 1 use_std_to_de
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MOPEX User’s Guide Use Refined Po
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MOPEX User’s Guide Here FLUXCONV
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MOPEX User’s Guide This module cr
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MOPEX User’s Guide year) and with
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MOPEX User’s Guide Mosaic FIF Tab
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MOPEX User’s Guide Tile BCD file
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MOPEX User’s Guide Window X, Y: (
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MOPEX User’s Guide neighboring pi
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⎛ ⎜ ⎜ P( j) = ⎜ 1+ ⎜ ⎜
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&END MOPEX User’s Guide if use_ps
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MOPEX User’s Guide \float Tile_Of
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MOPEX User’s Guide Input Type: De
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A.1.3 Under Construction Running MO
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Appendix B. Full List of Modules in
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Mosaic Interpolate run_mosaic_int P
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Running MOPEX on the Command Line a
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B.5 PRF Estimate Modules Running MO
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Instrument PRF Samp c Norm Radius (
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Some Tips for MOPEX with Spitzer Da
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