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:
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)]
Attributes Summary
eta | |
param_names | |
xi |
Methods Summary
evaluate(phi, theta, xi, eta) |
Attributes Documentation
Methods Documentation