This is the command mAdd that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
mAdd - Re-project and mosaic your images, with background rectification
mAdd [-p imgdir] [-n(o-areas)] [-a mean|median|count] [-e(xact-size)] [-d level] [-s
statusfile] images.tbl template.hdr out.fits
Coadd the reprojected images in an input list to form an output mosaic with FITS header
keywords specified in a header file. Creates two output files, one containing the coadded
pixel values, and the other containing coadded pixel area values. The pixel area values
can be used as a weighting function if the output pixel values are themselves to be
coadded with other projected images, and may also be used in validating the fidelity of
the output pixel values.
Specifies path to directory containing reprojected images. If the -p switch is not
included, mAdd will look for the input images in the current working directory.
-n Co-addition ignores weighting by pixel areas and performs coaddition based only on
pixel postions. This flag refers to input images; the area file for the output
image will still be created.
Select type of averaging to be done on accumulated pixel values (either mean or
median). To generate a map showing counts of how many times each pixel was
overlapped by the input images, use count.
-e Enables exact size mode. The output image will match the header template exactly,
instead of shrinking the output to fit the data.
Turns on debugging to the specified level (1-3).
mAdd output and errors will be written to statusfile instead of stdout.
ASCII table (generated by mImgtbl) containing metadata for all images to be
FITS header template to be used in generation of output FITS
Name of output FITS image.
If successful, mAdd creates a FITS file out.fits that is a coadd of all the FITS files in
the table images.tbl, according to the header template given. A corresponding
out_area.fits is also created.
OK [struct stat = "OK", time=time]
ERROR MPI initialization failed
ERROR Invalid argument for -a flag
ERROR Cannot open status file: statusfile
ERROR Invalid image metadata file: filename
ERROR Need columns: cntr,fname, crpix1, crpix2, cdelt1, cdelt2, naxis1, naxis2, crval1,
crval2 in image list
ERROR Memory allocation failed
ERROR Too many open files
ERROR Input wcsinit() failed.
ERROR Failed to allocate enough memory for output arrays
ERROR Bad WCS in header template.
ERROR Images are not in same pixel space.
ERROR Template file not found.
ERROR FITS library error
ERROR general error message
The following example runs mAdd on 4 FITS images, generating the output file mosaic.fits.
Related files are images.tbl and template.hdr.
$ mAdd -p proj images.tbl template.hdr output/mosaic.fits
[struct stat="OK", time=1]
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