Source code for dustmaps.lenz2017

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Reads the Lenz, Hensley & Doré (2017) dust reddening map.
# Copyright (C) 2018  Gregory M. Green
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

from __future__ import print_function, division

import os
import numpy as np
import healpy as hp
import as fits
import astropy.units as units

from .std_paths import *
from .healpix_map import HEALPixFITSQuery
from . import fetch_utils
from . import dustexceptions

[docs]class Lenz2017Query(HEALPixFITSQuery): """ Queries the Lenz, Hensley & Doré (2017) dust map: """
[docs] def __init__(self, map_fname=None): """ Args: map_fname (Optional[:obj:`str`]): Filename for the Lenz map. Defaults to ``None``, meaning that the default location is used. """ if map_fname is None: map_fname = os.path.join( data_dir(), 'lenz2017', 'ebv_lhd.hpx.fits') try: super(Lenz2017Query, self).__init__( map_fname, 'galactic', hdu=1, field='EBV') except IOError as error: print(dustexceptions.data_missing_message('lenz2017', 'Lenz et al. (2017)')) raise error
[docs] def query(self, coords, **kwargs): """ Returns E(B-V), in mags, at the specified location(s) on the sky. Args: coords (:obj:`astropy.coordinates.SkyCoord`): The coordinates to query. Returns: A float array of the reddening, in magnitudes of E(B-V), at the selected coordinates. """ return super(Lenz2017Query, self).query(coords, **kwargs)
[docs]def fetch(): """ Downloads the Lenz, Hensley & Doré (2017) dust map, placing it in the default :obj:`dustmaps` data directory. """ doi = '10.7910/DVN/AFJNWJ' fname = os.path.join( data_dir(), 'lenz2017', 'ebv_lhd.hpx.fits') fetch_utils.dataverse_download_doi( doi, fname, file_requirements={'filename': 'ebv_lhd.hpx.fits'})
def main(): from astropy.coordinates import SkyCoord q = Lenz2017Query() c = SkyCoord([0., 180., 0.], [0., 0., 90.], frame='galactic', unit='deg') print(q(c)) if __name__ == '__main__': main()