Skip to main content
`Ctrl`+`K`

# Source code for astropy.wcs

    # Licensed under a 3-clause BSD style license - see LICENSE.rst
    """World Coordinate System (WCS) transformations in FITS files.

    .. _wcslib: https://www.atnf.csiro.au/people/mcalabre/WCS/wcslib/index.html
    .. _distortion paper: https://www.atnf.csiro.au/people/mcalabre/WCS/dcs_20040422.pdf
    .. _SIP: https://irsa.ipac.caltech.edu/data/SPITZER/docs/files/spitzer/shupeADASS.pdf
    .. _FITS WCS standard: https://fits.gsfc.nasa.gov/fits_wcs.html

    `astropy.wcs` contains utilities for managing World Coordinate System
    (WCS) transformations in FITS files.  These transformations map the
    pixel locations in an image to their real-world units, such as their
    position on the sky sphere.

    It performs three separate classes of WCS transformations:

    - Core WCS, as defined in the `FITS WCS standard`_, based on Mark
      Calabretta's `wcslib`_.  See `~astropy.wcs.Wcsprm`.
    - Simple Imaging Polynomial (`SIP`_) convention.  See
      `~astropy.wcs.Sip`.
    - table lookup distortions as defined in WCS `distortion paper`_.  See
      `~astropy.wcs.DistortionLookupTable`.

    Each of these transformations can be used independently or together in
    a standard pipeline.
    """

    from . import utils
    from .wcs import *
    from .wcs import InvalidTabularParametersError  # just for docs

    def get_include():
        """
        Get the path to astropy.wcs's C header files.
        """
        import os

        return os.path.join(os.path.dirname(__file__), "include")