Pix2Sky_CylindricalPerspective

class astropy.modeling.projections.Pix2Sky_CylindricalPerspective(mu=1.0, lam=1.0, **kwargs)[source] [edit on github]

Bases: astropy.modeling.projections.Pix2SkyProjection, astropy.modeling.projections.Cylindrical

Cylindrical perspective - pixel to sky.

Corresponds to the CYP projection in FITS WCS.

\[\begin{split}\phi &= \frac{x}{\lambda} \\ \theta &= \arg(1, \eta) + \sin{-1}\left(\frac{\eta \mu}{\sqrt{\eta^2 + 1}}\right)\end{split}\]

where:

\[\eta = \frac{\pi}{180^{\circ}}\frac{y}{\mu + \lambda}\]
Parameters:

mu : float

Distance from center of sphere in the direction opposite the projected surface, in spherical radii, μ. Default is 1.

lam : float

Radius of the cylinder in spherical radii, λ. Default is 1.

Attributes Summary

lam
mu
param_names

Methods Summary

evaluate(x, y, mu, lam)

Attributes Documentation

lam
mu
param_names = ('mu', 'lam')

Methods Documentation

classmethod evaluate(x, y, mu, lam)[source] [edit on github]