VLT-MAN-ESO-14650-4942
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24.06.2015
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2) Optionally: create the masterdark
Same than 1) for combining the images.
3) Create the masterflatfield
Same than 1) for combining the images.
Determine the count level with the IRAF imstat task.
Normalize the image with the imarith task to obtain the master flatfield.
4) Correct the science images for bias, dark, and flatfield
Use the imarith task.
5) Stack the science images WCS based: use swarp
It is possible to use the IRAF tasks imstack or imcombine to combine the science images.
However, it has been shown that IRAF does not always properly handle large images or the
WCS. Therefore, we recommend to use the swarp software from astromatic (ex-TERAPIX)
from E. Bertin (http://www.astromatic.net/software/swarp).
Syntax:
swarp @liste_files_images -c configuration_file
the configuration_file contains all the parameters needed for the creation of the mosaic
taking into account the WCS and recomputing it.
In the file liste_files_images: list all images that are needed for the mosaic.
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