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