Sky2Pix_SlantOrthographic¶
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class
astropy.modeling.projections.
Sky2Pix_SlantOrthographic
(xi=0.0, eta=0.0, **kwargs)[source] [edit on github]¶ Bases:
astropy.modeling.projections.Sky2PixProjection
,astropy.modeling.projections.Zenithal
Slant orthographic projection - sky to pixel.
Corresponds to the
SIN
projection in FITS WCS.See
Zenithal
for a definition of the full transformation.The following transformation applies when \(\xi\) and \(\eta\) are both zero.
\[R_\theta = \frac{180^{\circ}}{\pi}\cos \theta\]But more specifically are:
\[\begin{split}x &= \frac{180^\circ}{\pi}[\cos \theta \sin \phi + \xi(1 - \sin \theta)] \\ y &= \frac{180^\circ}{\pi}[\cos \theta \cos \phi + \eta(1 - \sin \theta)]\end{split}\]Attributes Summary
eta
param_names
xi
Methods Summary
evaluate
(phi, theta, xi, eta)Evaluate the model on some input variables. Attributes Documentation
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eta
¶
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param_names
= ('xi', 'eta')¶
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xi
¶
Methods Documentation
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classmethod
evaluate
(phi, theta, xi, eta)[source] [edit on github]¶ Evaluate the model on some input variables.
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