Visibility

ska_sdp_func_python.visibility.base Module

Base simple visibility operations, placed here to avoid circular dependencies.

`calculate_visibility_phasor`(direction, vis)	Calculate the phasor for a component for a Visibility.
`calculate_visibility_uvw_lambda`(vis)	Recalculate the uvw_lambda values.
`phaserotate_visibility`(vis, newphasecentre)	Phase rotate from the current phase centre to a new phase centre.

Visibility operations

`concatenate_visibility_frequency`(bvis_list)	Concatenate a list of Visibility's in frequency.
`concatenate_visibility`(vis_list[, dim])	Concatenate a list of visibilities.
`subtract_visibility`(vis, model_vis[, inplace])	Subtract model_vis from vis, returning new visibility.
`remove_continuum_visibility`(vis[, degree, mask])	Fit and remove continuum visibility.
`divide_visibility`(vis, modelvis)	Divide visibility by model forming visibility for equivalent point source.
`integrate_visibility_by_channel`(vis)	Integrate visibility across all channels, returning new visibility.
`average_visibility_by_channel`(vis[, ...])	Average visibility by groups of channels, returning list of new visibility.
`convert_visibility_to_stokes`(vis)	Convert the polarisation frame data into Stokes parameters.
`convert_visibility_to_stokesI`(vis)	Convert the polarisation frame data into Stokes I dropping other polarisations, return new Visibility.
`convert_visibility_stokesI_to_polframe`(vis)	Convert the Stokes I into full polarisation, return new Visibility.
`expand_polarizations`(data[, dtype])	Expand number of polarizations to four Optionally change the data type
`copy_data_and_shrink_polarizations`(data, ...)	Shrink number of polarizations to nr_polarizations Optionally change the data type

Functions for calculating the geometry of a Visibility.

`calculate_visibility_azel`(bvis)	Return az el for a location, utc_time, and direction.
`calculate_visibility_hourangles`(bvis)	Return hour angles for location, utc_time, and direction.
`calculate_visibility_parallactic_angles`(bvis)	Return parallactic angles for location, utc_time, and direction.
`calculate_visibility_transit_time`(bvis)	Find the UTC time of the nearest transit.