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Generalized World Coordinate System (GWCS) is anAstropy affiliated package providing tools for managing the World Coordinate System of astronomical data.

GWCS takes a general approach to the problem of expressing transformations between pixel and world coordinates. It supports a data model which includes the entire transformation pipeline from input coordinates (detector by default) to world coordinates. It is tightly integrated withAstropy.

• Transforms are instances ofastropy.Model. They can be chained, joined or combined with arithmetic operators using the flexible framework of compound models inastropy.modeling.
• Celestial coordinates are instances ofastropy.SkyCoord and are transformed to other standard celestial frames usingastropy.coordinates.
• Time coordinates are represented byastropy.Time and can be further manipulated using the tools inastropy.time
• Spectral coordinates areastropy.Quantity objects and can be converted to other units using the tools inastropy.units.

For complete features and usage examples see thedocumentation site.

To install:

pip install gwcs

To clone from github and install the master branch:

git clone https://github.com/spacetelescope/gwcs.gitcd gwcspip install --editable .

We welcome feedback and contributions to the project. Contributions ofcode, documentation, or general feedback are all appreciated. Pleasefollow thecontributing guidelines to submit anissue or a pull request.

We strive to provide a welcoming community to all of our users byabiding to theCode of Conduct.

If you use GWCS, please cite the package via its Zenodo record.