irfpy.mexpvat.frame

Frame conversion for MEX.

High level fuctions for MEX frame conversion. It uses SPICE in its low-level functions, so that you may need to furnsh irfpy.mexpvat.mexspice before using.

>>> from irfpy.mexpvat import mexspice
>>> mexspice.init()
irfpy.mexpvat.frame.irfpy_framenames = {'ASPERA': 'MEX_ASPERA', 'ELS': 'MEX_ASPERA_ELS', 'IMA': 'MEX_ASPERA_IMAS', 'NPD1': 'MEX_ASPERA_NPD1', 'NPD2': 'MEX_ASPERA_NPD2', 'NPI': 'MEX_ASPERA_NPI', 'SAF': 'MEX_ASPERA_SAF', 'SC': 'MEX_SC', 'URF': 'MEX_ASPERA_URF'}

Conversion table of frame names

irfpy users can use the customized frame name above. The defined name overwrite the spice name in the functions of this module.

Note

The use of the name convection is limited inside this module. These names does not register to SPICE.

irfpy.mexpvat.frame.spicename(origname)[source]

Return the SPICE name

Convert the origname to spicename. Name conversion using irfpy_framenames table, and if no entry originame is returned as is.

irfpy.mexpvat.frame.convert_matrix(t, fromframe='MEX_SC', toframe='MSO')[source]

Return conversion matrix as a numpy array.

Parameters

t – datatime.datetime object specifying time.

Returns

Numpy array of the conversion matrix. numpy.pxform is used.

Conversion between IMA frame and SC frame is

>>> from irfpy.mexpvat import mexspice
>>> mexspice.init(level='noatt')
>>> import datetime
>>> t = datetime.datetime.now()   # This is just a placeholder, as they are fixed each other.
>>> matx = convert_matrix(t, fromframe='IMA', toframe='MEX_SPACECRAFT')
>>> from irfpy.util.with_context import printoptions
>>> with printoptions(suppress=True, precision=3):  # Note: -0. should be the same as 0., but...
...     print(matx)
[[-1. -0. -0.]
 [ 0.  0. -1.]
 [ 0. -1. -0.]]
irfpy.mexpvat.frame.doctests()[source]