Bases: astropy.modeling.projections.Pix2SkyProjection, astropy.modeling.projections.Zenithal
Slant orthographic projection - pixel to sky.
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.
\theta = \cos^{-1}\left(\frac{\pi}{180^{\circ}}R_\theta\right)
The parameters \xi and \eta are defined from the reference point (\phi_c, \theta_c) as:
\xi &= \cot \theta_c \sin \phi_c \\ \eta &= - \cot \theta_c \cos \phi_c
Parameters: | xi : float
eta : float
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Attributes Summary
eta | |
param_names | |
xi |
Methods Summary
evaluate(x, y, xi, eta) |
Attributes Documentation
Methods Documentation