Sky2Pix_CylindricalEqualArea

class astropy.modeling.projections.Sky2Pix_CylindricalEqualArea(lam=1, **kwargs)[source]

Bases: astropy.modeling.projections.Sky2PixProjection, astropy.modeling.projections.Cylindrical

Cylindrical equal area projection - sky to pixel.

Corresponds to the CEA projection in FITS WCS.

\[\begin{split}x &= \phi \\ y &= \frac{180^{\circ}}{\pi}\frac{\sin \theta}{\lambda}\end{split}\]
Parameters
lamfloat

Radius of the cylinder in spherical radii, λ. Default is 0.

Attributes Summary

lam

param_names

Names of the parameters that describe models of this type.

Methods Summary

evaluate(phi, theta, lam)

Evaluate the model on some input variables.

Attributes Documentation

lam = Parameter('lam', value=1.0)
param_names = ('lam',)

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.

Methods Documentation

classmethod evaluate(phi, theta, lam)[source]

Evaluate the model on some input variables.