# Installation¶

There are two ways to install dustmaps.

## 1. Using pip¶

From the commandline, run

pip install dustmaps


You may have to use sudo.

Next, we’ll configure the package and download the dust maps we’ll want to use. Start up a python interpreter and type:

from dustmaps.config import config
config['data_dir'] = '/path/to/store/maps/in'

import dustmaps.sfd
dustmaps.sfd.fetch()

import dustmaps.planck
dustmaps.planck.fetch()

import dustmaps.bayestar
dustmaps.bayestar.fetch()

import dustmaps.iphas
dustmaps.iphas.fetch()

import dustmaps.marshall
dustmaps.marshall.fetch()

import dustmaps.chen2014
dustmaps.chen2014.fetch()

import dustmaps.lenz2017
dustmaps.lenz2017.fetch()


All the dust maps should now be in the path you gave to config['data_dir']. Note that these dust maps can be very large - some are several Gigabytes! Only download those you think you’ll need.

Note that there are two versions of the Bayestar dust map. By default, dustmaps.bayestar.fetch() will download Bayestar17 (Green et al. 2018). In order to download the earlier version of the map (Green et al. 2015), you can call dustmaps.bayestar.fetch(version='bayestar2015').

## 2. Using setup.py¶

An alternative way to download dustmaps, if you don’t want to use pip, is to download or clone the respository from https://github.com/gregreen/dustmaps. Then, from the root directory of the package, run

python setup.py install --large-data-dir=/path/to/store/maps/in


Then, fetch the maps you’d like to use:

python setup.py fetch --map-name=sfd
python setup.py fetch --map-name=planck
python setup.py fetch --map-name=bayestar
python setup.py fetch --map-name=iphas
python setup.py fetch --map-name=marshall
python setup.py fetch --map-name=chen2014
python setup.py fetch --map-name=lenz2017


Since these maps are very large - up to several Gigabytes - be careful to only download those you think you’ll need. That’s it!

python setup.py fetch --map-name=bayestar2015