Source code for astropy.coordinates.builtin_frames.itrs
# -*- coding: utf-8 -*-
# Licensed under a 3-clause BSD style license - see LICENSE.rst
from astropy.utils.decorators import format_doc
from astropy.coordinates.representation import CartesianRepresentation, CartesianDifferential
from astropy.coordinates.baseframe import BaseCoordinateFrame, base_doc
from astropy.coordinates.attributes import TimeAttribute
from .utils import DEFAULT_OBSTIME
__all__ = ['ITRS']
[docs]@format_doc(base_doc, components="", footer="")
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
default_differential = CartesianDifferential
obstime = TimeAttribute(default=DEFAULT_OBSTIME)
@property
def earth_location(self):
"""
The data in this frame as an `~astropy.coordinates.EarthLocation` class.
"""
from astropy.coordinates.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