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Add nside2radec

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rstiskalek 2023-06-01 22:57:29 +01:00
parent c9829c0acc
commit 64bacc20db
1 changed files with 21 additions and 0 deletions
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21
csiborgtools/field/utils.py
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@ -17,6 +17,7 @@ Utility functions for the field module.
"""
from warnings import warn
import healpy
import numpy
import smoothing_library as SL
@ -65,3 +66,23 @@ def smoothen_field(field, smooth_scale, boxsize, threads=1):
W_k = SL.FT_filter(boxsize, smooth_scale, field.shape[0], "Gaussian",
threads)
return SL.field_smoothing(field, W_k, threads)
def nside2radec(nside):
"""
Generate RA and declination for HEALPix pixel centres.
Parameters
----------
nside : int
HEALPix nside parameter.
Returns
-------
radec : array of shape `(npix, 2)`
RA and declination in degrees.
"""
pixs = numpy.arange(healpy.nside2npix(nside))
theta, phi = healpy.pix2ang(nside, pixs)
theta -= numpy.pi / 2
return numpy.rad2deg(numpy.vstack([phi, theta]).T)