Sky2Pix_BonneEqualArea¶
-
class
astropy.modeling.projections.
Sky2Pix_BonneEqualArea
(*args, **kwargs)[source]¶ Bases:
astropy.modeling.projections.Sky2PixProjection
,astropy.modeling.projections.PseudoConic
Bonne’s equal area pseudoconic projection - sky to pixel.
Corresponds to the
BON
projection in FITS WCS.\[\begin{split}x &= R_\theta \sin A_\phi \\ y &= -R_\theta \cos A_\phi + Y_0\end{split}\]where:
\[\begin{split}A_\phi &= \frac{180^\circ}{\pi R_\theta} \phi \cos \theta \\ R_\theta &= Y_0 - \theta \\ Y_0 &= \frac{180^\circ}{\pi} \cot \theta_1 + \theta_1\end{split}\]- Parameters
- theta1
float
Bonne conformal latitude, in degrees.
- theta1
Attributes Summary
Names of the parameters that describe models of this type.
Attributes Documentation
-
param_names
= ('theta1',)¶ 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.
-
theta1
= _ParameterDS('theta1', value=0.0)¶