# ITRS¶

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

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