Sky2Pix_CylindricalPerspective

class astropy.modeling.projections.Sky2Pix_CylindricalPerspective(mu=1.0, lam=1.0, **kwargs)[source] [edit on github]

Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.Cylindrical

Cylindrical Perspective - sky to pixel.

Corresponds to the CYP projection in FITS WCS.

\[\begin{split}x &= \lambda \phi \\ y &= \frac{180^{\circ}}{\pi}\left(\frac{\mu + \lambda}{\mu + \cos \theta}\right)\sin \theta\end{split}\]
Parameters:

mu : float

Distance from center of sphere in the direction opposite the projected surface, in spherical radii, μ. Default is 0.

lam : float

Radius of the cylinder in spherical radii, λ. Default is 0.

Attributes Summary

lam
mu
param_names

Methods Summary

evaluate(phi, theta, mu, lam)

Attributes Documentation

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

Methods Documentation

classmethod evaluate(phi, theta, mu, lam)[source] [edit on github]