Sky2Pix_ZenithalPerspective¶
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class
astropy.modeling.projections.
Sky2Pix_ZenithalPerspective
(*args, **kwargs)[source]¶ Bases:
astropy.modeling.projections.Sky2PixProjection
,astropy.modeling.projections.Zenithal
Zenithal perspective projection - sky to pixel.
Corresponds to the
AZP
projection 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
Attributes Summary
Names of the parameters that describe models of this type.
Attributes Documentation
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gamma
= _ParameterDS('gamma', value=0.0)¶
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param_names
= ('mu', 'gamma')¶ Names of the parameters that describe models of this type.
The parameters in this tuple are in the same order they should be passed in when initializing a model of a specific type. Some types of models, such as polynomial models, have a different number of parameters depending on some other property of the model, such as the degree.
When defining a custom model class the value of this attribute is automatically set by the
Parameter
attributes defined in the class body.