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# -*- 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
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
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