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# Source code for astropy.coordinates.builtin_frames.itrs

    # -*- coding: utf-8 -*-
    # Licensed under a 3-clause BSD style license - see LICENSE.rst
    from __future__ import (absolute_import, unicode_literals, division,
                            print_function)

    from ..representation import CartesianRepresentation
    from ..baseframe import BaseCoordinateFrame, TimeFrameAttribute, frame_transform_graph
    from ..transformations import FunctionTransform
    from .utils import DEFAULT_OBSTIME

    class ITRS(BaseCoordinateFrame):
        """
        A coordinate or frame in the International Terrestrial Reference System
        (ITRS).  This is approximately a geocentric system, although strictly it is
        defined by a series of reference locations near the surface of the Earth.
        For more background on the ITRS, see the references provided in the
        :ref:`astropy-coordinates-seealso` section of the documentation.
        """

        default_representation = CartesianRepresentation

        obstime = TimeFrameAttribute(default=DEFAULT_OBSTIME)

        @property
        def earth_location(self):
            """
            The data in this frame as an `~astropy.coordinates.EarthLocation` class.
            """
            from ..earth import EarthLocation

            cart = self.represent_as(CartesianRepresentation)
            return EarthLocation(x=cart.x, y=cart.y, z=cart.z)

    # Self-transform is in intermediate_rotation_transforms.py with all the other
    # ITRS transforms