Pix2Sky_ConicEquidistant¶
-
class
astropy.modeling.projections.
Pix2Sky_ConicEquidistant
(*args, **kwargs)[source]¶ Bases:
astropy.modeling.projections.Pix2SkyProjection
,astropy.modeling.projections.Conic
Conic equidistant projection - pixel to sky.
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
- sigmafloat
\((\theta_1 + \theta_2) / 2\), where \(\theta_1\) and \(\theta_2\) are the latitudes of the standard parallels, in degrees. Default is 90.
- deltafloat
\((\theta_1 - \theta_2) / 2\), where \(\theta_1\) and \(\theta_2\) are the latitudes of the standard parallels, in degrees. Default is 0.
Methods Summary
evaluate
(x, y, sigma, delta)Evaluate the model on some input variables.
Methods Documentation