healpix_to_lonlat

astropy_healpix.healpix_to_lonlat(healpix_index, nside, dx=None, dy=None, order='ring')

Convert HEALPix indices (optionally with offsets) to longitudes/latitudes.

If no offsets (dx and dy) are provided, the coordinates will default to those at the center of the HEALPix pixels.

Parameters:

healpix_index : int or ndarray

HEALPix indices (as a scalar or array)

nside : int

Number of pixels along the side of each of the 12 top-level HEALPix tiles

dx, dy : float or ndarray, optional

Offsets inside the HEALPix pixel, which must be in the range [0:1], where 0.5 is the center of the HEALPix pixels (as scalars or arrays)

order : { ‘nested’ | ‘ring’ }, optional

Order of HEALPix pixels

Returns:

lon : Longitude

The longitude values

lat : Latitude

The latitude values