Pix2Sky_CylindricalPerspective¶
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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.CylindricalCylindrical perspective - pixel to sky.
Corresponds to the
CYPprojection 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
lammuparam_namesMethods Summary
evaluate(x, y, mu, lam)Evaluate the model on some input variables. Attributes Documentation
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lam¶
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mu¶
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param_names= ('mu', 'lam')¶
Methods Documentation
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classmethod
evaluate(x, y, mu, lam)[source] [edit on github]¶ Evaluate the model on some input variables.