DataDescription

class DataDescription(dd_id, spw, pol_id)

Bases: object

A logical representation of an entry in the DATA_DESCRIPTION table.

The DATA_DESCRIPTION table in the measurement set defines the shape of the data in the MAIN table.

Parameters:

• dd_id (int)

• spw (SpectralWindow)

• pol_id (int)

id

Numerical identifier of the data description entry.

spw

SpectralWindow object for the spectral window ID associated with the data description.

pol_id

Polarization ID associated with the data description.

obs_time

Mean of midpoint observation times for data matching the data description.

chan_freq

List of channel centre frequencies for data matching the data description.

corr_axis

Vector containing polarization labels that were correlated together for data matching the data description.

Attributes Summary

num_polarizations	Return number of polarizations in the DataDescription.
polarizations	Return polarizations in the DataDescription.

Methods Summary

get_polarization_id(pol)	Get the polarization ID associated with given polarization label.
get_polarization_label(pol_id)	Get the polarization label associated with given polarization ID.

Attributes Documentation

num_polarizations

Return number of polarizations in the DataDescription.

polarizations

Return polarizations in the DataDescription.

Returns:

List of polarizations.

Methods Documentation

static get_polarization_id(pol)

Get the polarization ID associated with given polarization label.

Parameters:

pol (str) -- Polarization label to get ID for.

Returns:

Polarization ID associated with given label.

Return type:

int

get_polarization_label(pol_id)

Get the polarization label associated with given polarization ID. This converts an integer to a string, eg. 0 -> 'XX'.

Parameters:

pol_id (int) -- Polarization ID to get label for.

Returns:

Polarization label associated with given ID.

Return type:

str