MOPEX User's Guide - IRSA

MOPEX User’s Guide
The gain in speed is up to 10 times that of the Default method. The price you pay is the
fidelity of the interpolated images, so in gene ral these should not be use d for science.
4. Cubic This method uses a bicubic interpolation. It is like the Default method except
that each output pixel is a weighted sum of the 16 nearest input pixels, with the weights
determined by bicubic polynomials. A tunable parameter Alpha (float) pins the weights.
The default value of -0.5 should be used. Note: this method could be useful in high S/N
cases because it enforces smoothness in the interpolation function, but the major
drawback is significantly more noise correlation than the Default linear interpolation.
Mosaic Interpolate output subdirectory: The subdirectory of that you wish
to use for the output files. Default is Interp-mosaic.
COMMAND LINE INPUT
&MOSAICINTIN
INTERP_METHOD = 1,
FINERES = 0,
DRIZ_FAC = 1,
GRID_RATIO = 4,
ALPHA = -0.5,
&END
In Global Parameters:
INTERP_DIR = Interp-mosaic
OUTPUT
Mosaic FIF Table (mosaic_fif.tbl): The FIF table describing the final mosaic, taking into
account the user-selected pixel size. Note: This file is saved in the top level Output directory.
Geometry Output Table (interp_ImageList.txt.tbl): The interpolated images' offsets in x-
and y-direction relative to the FIF and their sizes are specified in this file.
Interp Stack (interp_*fits): The output images, interpolated, distortion-corrected, and
projected onto the output FIF. A list is also made.
Coverage Stack (interp_*covg.fits): The corresponding coverage maps for each output
image, taking into account the bad pixels in the input. A list is also made.
Mosaicking (mosaic.pl) 66
Mosaic Modules