healpy.ringinfo

healpy.ringinfo(nside, ring)

Get information for rings

Rings are specified by a positive integer, 1 <= ring <= 4*nside-1.

Parameters:

nsideint

The healpix nside parameter, must be a power of 2, less than 2**30

ring1d numpy array

The ring number

Returns:

startpixint64, length equal to that of ring

Starting pixel identifier (NEST ordering)

ringpixint64, length equal to that of ring

Number of pixels in ring

costhetafloat, length equal to that of ring

Cosine of the co-latitude

sinthetafloat, length equal to that of ring

Sine of the co-latitude

shiftedbool, length equal to that of ring

If True, the center of the first pixel is not at phi=0