neighbours¶
-
astropy_healpix.
neighbours
(healpix_index, nside, order='ring')[source]¶ Find all the HEALPix pixels that are the neighbours of a HEALPix pixel
Parameters: healpix_index :
ndarray
Array of HEALPix pixels
nside : int
Number of pixels along the side of each of the 12 top-level HEALPix tiles
order : { ‘nested’ | ‘ring’ }
Order of HEALPix pixels
Returns: neigh :
ndarray
Array giving the neighbours starting SW and rotating clockwise. This has one extra dimension compared to
healpix_index
- the first dimension - which is set to 8. For example if healpix_index has shape (2, 3),neigh
has shape (8, 2, 3).