boundaries(nside, pix, step=1, nest=False)¶
Returns an array containing vectors to the boundary of the nominated pixel.
The returned array has shape (3, 4*step), the elements of which are the x,y,z positions on the unit sphere of the pixel boundary. In order to get vector positions for just the corners, specify step=1.
nside : int
The nside of the Healpix map.
pix : int
step : int, optional
Number of elements for each side of the pixel.
nest : bool, optional
if True, assume NESTED pixel ordering, otherwise, RING pixel ordering
boundary : float, array
x,y,z for positions on the boundary of the pixel