Sky2Pix_ZenithalPerspective¶
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class
astropy.modeling.projections.Sky2Pix_ZenithalPerspective(mu=0.0, gamma=0.0, **kwargs)[source] [edit on github]¶ Bases:
astropy.modeling.projections.Sky2PixProjection,astropy.modeling.projections.ZenithalZenithal perspective projection - sky to pixel.
Corresponds to the
AZPprojection in FITS WCS.\[\begin{split}x &= R \sin \phi \\ y &= -R \sec \gamma \cos \theta\end{split}\]where:
\[R = \frac{180^{\circ}}{\pi} \frac{(\mu + 1) \cos \theta}{(\mu + \sin \theta) + \cos \theta \cos \phi \tan \gamma}\]Parameters: - mu : float
Distance from point of projection to center of sphere in spherical radii, μ. Default is 0.
- gamma : float
Look angle γ in degrees. Default is 0°.
Attributes Summary
gammamuparam_namesMethods Summary
evaluate(phi, theta, mu, gamma)Evaluate the model on some input variables. Attributes Documentation
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gamma¶
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mu¶
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param_names= ('mu', 'gamma')¶
Methods Documentation
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classmethod
evaluate(phi, theta, mu, gamma)[source] [edit on github]¶ Evaluate the model on some input variables.