Uniform interface for multiple dust reddening maps.
Project description
A uniform interface for a number of 2D and 3D maps of interstellar dust reddening/extinction.
Supported Dust Maps
Schlegel, Finkbeiner & Davis (1998; SFD’98)
Planck Collaboration (2013)
Green, Schlafly, Finbeiner et al. (2015; Bayestar)
Sale et al. (2014; IPHAS)
Burstein & Heiles (1982; BH’82)
Installation
Download the repository and then run:
python setup.py install –large-data-dir=/path/where/you/want/large/data/files/stored
Alternatively, you can use pip:
pip install dustmaps
Getting the Data
To fetch the data for the SFD dust map, run:
python setup.py fetch –map-name=sfd
You can download the other dust maps by changing “sfd” to “planck”, “bayestar”, “iphas” or “bh”.
Alternatively, if you have used pip to install dustmaps, then you can configure the data directory and download the data by opening up a python interpreter and running:
>>> from dustmaps.config import config >>> config['data_dir'] = '/path/where/you/want/large/data/files/stored' >>> >>> import dustmaps.sfd >>> dustmaps.sfd.fetch() >>> >>> import dustmaps.planck >>> dustmaps.planck.fetch() >>> >>> import dustmaps.bayestar >>> dustmaps.bayestar.fetch() >>> >>> import dustmaps.iphas >>> dustmaps.iphas.fetch()
Querying the Maps
Maps are queried using astropy.coordinate.SkyCoord objects. This means that any coordinate system can be used as input. For example, we can query SFD’98 as follows:
>>> from dustmaps.sfd import SFDQuery >>> from astropy.coordinates import SkyCoord >>> >>> sfd = SFDQuery() >>> >>> c = SkyCoord( '05h00m00.00000s', '+30d00m00.0000s', frame='icrs') >>> print sfd(c) 0.483961
Above, we’ve used the ICRS coordinate system (the inputs are RA and Dec). We can use other coordinate systems, such as Galactic coordinates, and we can provide coordinate arrays. The following example uses both features:
>>> c = SkyCoord( [75.00000000, 130.00000000], [-89.00000000, 10.00000000], frame='galactic', unit='deg') >>> print sfd(c) [ 0.0146584 0.97695869]
Documentation
Read the full documentation at http://dustmaps.readthedocs.io/en/latest/.
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