sanson_flamsteed-1.0.0

The Sanson-Flamsteed projection.

Description

Corresponds to the SFL projection in the FITS WCS standard.

The pixel-to-sky transformation is defined as:

\[\begin{split}\phi &= \frac{x}{\cos y} \\ \theta &= y\end{split}\]

And the sky-to-pixel transformation is defined as:

\[\begin{split}x &= \phi \cos \theta \\ y &= \theta\end{split}\]

Invertibility: All ASDF tools are required to provide the inverse of this transform.

Outline

• Schema Definitions
• Original Schema

Schema Definitions

This node must validate against all of the following:

• pseudocylindrical-1.0.0

Original Schema

%YAML 1.1
---
$schema: "http://stsci.edu/schemas/yaml-schema/draft-01"
id: "http://stsci.edu/schemas/asdf/transform/sanson_flamsteed-1.0.0"
title: |
  The Sanson-Flamsteed projection.

description: |
  Corresponds to the `SFL` projection in the FITS WCS standard.

  The pixel-to-sky transformation is defined as:

  $$\phi &= \frac{x}{\cos y} \\
    \theta &= y$$

  And the sky-to-pixel transformation is defined as:

  $$x &= \phi \cos \theta \\
    y &= \theta$$

  Invertibility: All ASDF tools are required to provide the inverse of
  this transform.

allOf:
  - $ref: "pseudocylindrical-1.0.0"
...