ITRS

class astropy.coordinates.builtin_frames.ITRS(*args, copy=True, representation_type=None, differential_type=None, **kwargs)

Bases: astropy.coordinates.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 See Also section of the documentation.

Parameters:

data : BaseRepresentation subclass instance

A representation object or None to have no data (or use the coordinate component arguments, see below).

representation_type : BaseRepresentation subclass, str, optional

A representation class or string name of a representation class. This sets the expected input representation class, thereby changing the expected keyword arguments for the data passed in. For example, passing representation_type='cartesian' will make the classes expect position data with cartesian names, i.e. x, y, z in most cases.

differential_type : BaseDifferential subclass, str, dict, optional

A differential class or dictionary of differential classes (currently only a velocity differential with key ‘s’ is supported). This sets the expected input differential class, thereby changing the expected keyword arguments of the data passed in. For example, passing differential_type='cartesian' will make the classes expect velocity data with the argument names v_x, v_y, v_z.

copy : bool, optional

If True (default), make copies of the input coordinate arrays. Can only be passed in as a keyword argument.

Attributes Summary

default_differential
default_representation
earth_location	The data in this frame as an EarthLocation class.
frame_attributes
frame_specific_representation_info
name
obstime

Attributes Documentation

default_differential

default_representation

earth_location

The data in this frame as an EarthLocation class.

frame_attributes = {'obstime': <astropy.coordinates.attributes.TimeAttribute object at 0x115295be0>}

frame_specific_representation_info

name = 'itrs'

obstime = <Time object: scale='tt' format='jyear_str' value=J2000.000>