"""
WMAP plotting with HEALPix
--------------------------
This example uses the :func:`astromL.datasets.fetch_wmap_temperatures`
functionality to download and plot the raw WMAP 7-year data.  The
visualization requires the `healpy <https://github.com/healpy/healpy>`_
package to be installed.
"""
# Author: Jake VanderPlas <vanderplas@astro.washington.edu>
# License: BSD
#   The figure is an example from astroML: see http://astroML.github.com
import numpy as np
from matplotlib import pyplot as plt

# warning: due to a bug in healpy, importing it before pylab can cause
#  a segmentation fault in some circumstances.
import healpy as hp

from astroML.datasets import fetch_wmap_temperatures

#------------------------------------------------------------
# Fetch the wmap data
wmap_unmasked = fetch_wmap_temperatures(masked=False)

#------------------------------------------------------------
# plot the unmasked map
fig = plt.figure(1)
hp.mollview(wmap_unmasked, min=-1, max=1, title='Raw WMAP data',
            fig=1, cmap=plt.cm.jet, unit=r'$\Delta$T (mK)')
plt.show()