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#!/usr/bin/env python3
#
# Copyright (c) 2016 Weitian LI <liweitianux@live.com>
# MIT license
"""
Recover the sky map in HPX projection format back into HEALPix table format,
i.e., the reverse of `healpix2hpx.py`.
"""
import os
import sys
import argparse
import numpy as np
from astropy.io import fits
import fg21sim
from fg21sim.utils import hpx2healpix
# Reference:
# http://docs.astropy.org/en/stable/io/fits/usage/table.html#column-creation
FITS_COLUMN_FORMATS = {
np.dtype("int16"): "I",
np.dtype("int32"): "J",
np.dtype("int64"): "K",
np.dtype("float32"): "E",
np.dtype("float64"): "D",
}
def main():
parser = argparse.ArgumentParser(
description="Recover the image in HPX projection to HEALPix data")
parser.add_argument("infile", help="input FITS image in HPX projection")
parser.add_argument("outfile", help="output HEALPix data file")
parser.add_argument("-C", "--clobber", action="store_true",
help="overwrite the existing output file")
parser.add_argument("-F", "--float", action="store_true",
help="use float (single precision) instead of double")
args = parser.parse_args()
tool = os.path.basename(sys.argv[0])
history = [
"TOOL: {0}".format(tool),
"PARAM: {0}".format(" ".join(sys.argv[1:])),
]
comments = [
'Tool "{0}" is part of the "{1}" package'.format(tool,
fg21sim.__title__),
'distributed under {0} license.'.format(fg21sim.__license__),
'See also {0}'.format(fg21sim.__url__)
]
hp_data, hp_header = hpx2healpix(args.infile,
append_history=history,
append_comment=comments)
if args.float:
hp_data = hp_data.astype(np.float32)
hdu = fits.BinTableHDU.from_columns([
fits.Column(name="I", array=hp_data,
format=FITS_COLUMN_FORMATS.get(hp_data.dtype))
], header=hp_header)
hdu.writeto(args.outfile, clobber=args.clobber, checksum=True)
if __name__ == "__main__":
main()
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