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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 numpy as np
from astropy.io import fits
import fg21sim
from fg21sim.configs import configs
from fg21sim.utils import hpx2healpix, setup_logging
# 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")
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__)
]
hp_data, hp_header = hpx2healpix(args.infile,
append_history=history,
append_comment=comments)
if args.float:
logger.info("HEALPix data: use single-precision float numbers")
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)
logger.info("HEALPix data write to FITS file: %s" % args.outfile)
if __name__ == "__main__":
main()
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