ITRS¶
- class astropy.coordinates.ITRS(*args, copy=True, representation_type=None, differential_type=None, **kwargs)[source]¶
Bases:
astropy.coordinates.baseframe.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,python: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 unless overridden viaframe_specific_representation_info
. To see this frame’s names, check out<this frame>().representation_info
.- differential_type
BaseDifferential
subclass,python:str
,python: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 namesv_x, v_y, v_z
unless overridden viaframe_specific_representation_info
. To see this frame’s names, check out<this frame>().representation_info
.- copybool, optional
If
True
(default), make copies of the input coordinate arrays. Can only be passed in as a keyword argument.
- data
Attributes Summary
Default representation for differential data (e.g., velocity)
Default representation for position data
The data in this frame as an
EarthLocation
class.Mapping for frame-specific component names
Attributes Documentation
- default_differential¶
Default representation for differential data (e.g., velocity)
- default_representation¶
Default representation for position data
- earth_location¶
The data in this frame as an
EarthLocation
class.
- frame_attributes = {'obstime': <astropy.coordinates.attributes.TimeAttribute object>}¶
- frame_specific_representation_info¶
Mapping for frame-specific component names
- name = 'itrs'¶
- obstime = <Time object: scale='tt' format='jyear_str' value=J2000.000>¶