TPCorr

class jwst.transforms.TPCorr(v2ref=0.0, v3ref=0.0, roll=0.0, matrix=[[1.0, 0.0], [0.0, 1.0]], shift=[0.0, 0.0], **kwargs)

Bases: astropy.modeling.core.Model

Apply V2ref, V3ref, and roll to input angles and project the point from the tangent plane onto a celestial sphere.

Parameters:

• v2ref (float) – V2 position of the reference point in degrees. Default is 0 degrees.
• v3ref (float) – V3 position of the reference point in degrees. Default is 0 degrees.
• roll (float) – Roll angle in degrees. Default is 0 degrees.

Attributes Summary

input_units	This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted).
inputs
matrix
outputs
param_names
r0	Radius of the generating sphere.
return_units	This property is used to indicate what units or sets of units the output of evaluate should be in, and returns a dictionary mapping outputs to units (or None if any units are accepted).
roll
shift
standard_broadcasting
v2ref
v3ref

Methods Summary

__call__(v2, v3[, model_set_axis, …])	Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.
cartesian2spherical(x, y, z)	Convert cartesian coordinates to spherical coordinates (in acrsec).
combine(t2, t1)	Combine transformation t2 with another transformation (t1) previously applied to the coordinates.
evaluate(v2, v3, v2ref, v3ref, roll, matrix, …)	Evaluate the model on some input variables.
spherical2cartesian(alpha, delta)	Convert spherical coordinates (in arcsec) to cartesian.
tanp_to_v2v3(xt, yt)	Converts tangent plane coordinates to V2V3 spherical coordinates.
v2v3_to_tanp(v2, v3)	Converts V2V3 spherical coordinates to tangent plane coordinates.

Attributes Documentation

input_units

This property is used to indicate what units or sets of units the evaluate method expects, and returns a dictionary mapping inputs to units (or None if any units are accepted).

Model sub-classes can also use function annotations in evaluate to indicate valid input units, in which case this property should not be overridden since it will return the input units based on the annotations.

inputs = ('v2', 'v3')

matrix

outputs = ('v2c', 'v3c')

param_names = ('v2ref', 'v3ref', 'roll', 'matrix', 'shift')

r0 = 206264.80624709636

Radius of the generating sphere. This sets the circumference to 360 deg so that arc length is measured in deg.

return_units

This property is used to indicate what units or sets of units the output of evaluate should be in, and returns a dictionary mapping outputs to units (or None if any units are accepted).

Model sub-classes can also use function annotations in evaluate to indicate valid output units, in which case this property should not be overridden since it will return the return units based on the annotations.

roll

shift

standard_broadcasting = False

v2ref

v3ref

Methods Documentation

__call__(v2, v3, model_set_axis=None, with_bounding_box=False, fill_value=nan, equivalencies=None)

Evaluate this model using the given input(s) and the parameter values that were specified when the model was instantiated.

static cartesian2spherical(x, y, z)

Convert cartesian coordinates to spherical coordinates (in acrsec).

classmethod combine(t2, t1)

Combine transformation t2 with another transformation (t1) previously applied to the coordinates. That is, transformation t2 is assumed to follow (=applied after) the transformation provided by the argument t1.

evaluate(v2, v3, v2ref, v3ref, roll, matrix, shift)

Evaluate the model on some input variables.

static spherical2cartesian(alpha, delta)

Convert spherical coordinates (in arcsec) to cartesian.

tanp_to_v2v3(xt, yt)

Converts tangent plane coordinates to V2V3 spherical coordinates.

v2v3_to_tanp(v2, v3)

Converts V2V3 spherical coordinates to tangent plane coordinates.