healpy.pixelfunc.nside2pixarea

healpy.pixelfunc.nside2pixarea(nside, degrees=False)

Give pixel area given nside in square radians or square degrees.

Parameters:

nside : int

healpix nside parameter, must be a power of 2, less than 2**30

degrees : bool

if True, returns pixel area in square degrees, in square radians otherwise

Returns:

pixarea : float

pixel area in square radian or square degree

Notes

Raise a ValueError exception if nside is not valid.

Examples

>>> import healpy as hp
>>> hp.nside2pixarea(128, degrees = True)
0.2098234113027917

>>> hp.nside2pixarea(256)
1.5978966540475428e-05

>>> hp.nside2pixarea(7)
Traceback (most recent call last):
   ...
ValueError: 7 is not a valid nside parameter (must be a power of 2, less than 2**30)