Sky2Pix_ConicEquidistant¶
-
class
astropy.modeling.projections.
Sky2Pix_ConicEquidistant
(*args, **kwargs)[source]¶ Bases:
astropy.modeling.projections.Sky2PixProjection
,astropy.modeling.projections.Conic
Conic equidistant projection - sky to pixel.
Corresponds to the
COD
projection in FITS WCS.See
Conic
for a description of the entire equation.The projection formulae are:
\[\begin{split}C &= \frac{180^\circ}{\pi} \frac{\sin\theta_a\sin\eta}{\eta} \\ R_\theta &= \theta_a - \theta + \eta\cot\eta\cot\theta_a \\ Y_0 = \eta\cot\eta\cot\theta_a\end{split}\]- Parameters