healpy.boundaries¶
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healpy.
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.
Parameters: - nside : int
The nside of the Healpix map.
- pix : int
Pixel identifier
- 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
Returns: - boundary : float, array
x,y,z for positions on the boundary of the pixel