1%YAML 1.1
2---
3$schema: "http://stsci.edu/schemas/yaml-schema/draft-01"
4id: "http://stsci.edu/schemas/asdf/transform/conic_equidistant-1.1.0"
5tag: "tag:stsci.edu:asdf/transform/conic_equidistant-1.1.0"
6title: |
7  Conic equidistant projection.
8
9description: |
10  Corresponds to the `COD` projection in the FITS WCS standard.
11
12  See
13  [conic](ref:http://stsci.edu/schemas/asdf/transform/conic-1.1.0)
14  for the definition of the full transformation.
15
16  The transformation is defined as:
17
18  $$C &= \frac{180^\circ}{\pi} \frac{\sin\theta_a\sin\eta}{\eta} \\
19    R_\theta &= \theta_a - \theta + \eta\cot\eta\cot\theta_a \\
20    Y_0 = \eta\cot\eta\cot\theta_a$$
21
22  Invertibility: All ASDF tools are required to provide the inverse of
23  this transform.
24
25$ref: "conic-1.1.0"
26...
27