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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 logging
import fg21sim
from fg21sim.configs import configs
from fg21sim.utils import hpx2healpix, write_fits_healpix, setup_logging
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("-l", "--log", dest="loglevel", default=None,
choices=["DEBUG", "INFO", "WARNING",
"ERROR", "CRITICAL"],
help="set the log level")
parser.add_argument("-L", "--logfile", default=None,
help="filename where to save the log messages")
parser.add_argument("-Q", "--quiet", action="store_true",
help="be quiet so do not log messages to screen")
args = parser.parse_args()
if args.quiet:
log_stream = ""
else:
log_stream = None
tool = os.path.basename(sys.argv[0])
pkgname = fg21sim.__pkgname__
setup_logging(dict_config=configs.logging,
level=args.loglevel,
stream=log_stream,
logfile=args.logfile)
logger = logging.getLogger(tool)
logger.info("COMMAND: {0}".format(" ".join(sys.argv)))
history = [
"TOOL: {0}".format(tool),
"PARAM: {0}".format(" ".join(sys.argv[1:])),
]
comments = [
'Tool "{0}" is part of the "{1}" package'.format(tool, pkgname),
'distributed under {0} license.'.format(fg21sim.__license__),
'See also {0}'.format(fg21sim.__url__)
]
if os.path.exists(args.outfile):
if args.clobber:
logger.warning("Remove existing output file: %s" % args.outfile)
os.remove(args.outfile)
else:
raise OSError("Output file already exists: %s" % args.outfile)
hp_data, hp_header = hpx2healpix(args.infile,
append_history=history,
append_comment=comments)
write_fits_healpix(args.outfile, hpmap=hp_data, header=hp_header)
logger.info("HEALPix data write to FITS file: %s" % args.outfile)
if __name__ == "__main__":
main()
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