Scan¶

class Scan(id=None, antennas=None, intents=None, fields=None, states=None, data_descriptions=None, scan_times=None)[source]¶

Bases: object

A logical representation of a single scan.

Parameters:

id (int | None)
antennas (list[Antenna] | None)
intents (list[str] | None)
fields (list[Field] | None)
states (list[State] | None)
data_descriptions (list[DataDescription] | None)
scan_times (dict | None)

id¶: The scan number within the MeasurementSet.

antennas¶: Set of Antenna objects for antennas associated with this scan.

intents¶: Set of Pipeline intents corresponding to the states associated with this scan.

fields¶: Set of Field objects for fields associated with this scan.

states¶: Set of State objects for states associated with this scan.

data_descriptions¶: Set of DataDescription objects for data description entries associated with this scan.

Attributes Summary

`end_time`	Return end time of the Scan as a CASA 'epoch' measure dictionary.
`spws`	Return set of SpectralWindow objects for spectral windows associated with this Scan.
`start_time`	Return start time of the Scan as a CASA 'epoch' measure dictionary.
`time_on_source`	Return time-on-source for the Scan.

Methods Summary

`exposure_time`(spw_id)	Return exposure time for this Scan for given spectral window ID.
`mean_interval`(spw_id)	Return the "mean" sub-scan integration time for given spectral window ID.

Attributes Documentation

end_time¶: Return end time of the Scan as a CASA 'epoch' measure dictionary.

spws¶: Return set of SpectralWindow objects for spectral windows associated with this Scan.

start_time¶: Return start time of the Scan as a CASA 'epoch' measure dictionary.

time_on_source¶: Return time-on-source for the Scan.

Methods Documentation

exposure_time(spw_id)[source]¶

Return exposure time for this Scan for given spectral window ID.

Parameters:: spw_id (int) -- Numerical identifier of spectral window to select.
Returns:: Exposure time for this Scan and given spectral window ID.
Return type:: timedelta

mean_interval(spw_id)[source]¶

Return the "mean" sub-scan integration time for given spectral window ID.

Note: at present, it is assumed that the integration time does not vary per sub-scan, and it therefore takes the integration time from the first sub-scan in this Scan to be representative (i.e. it does not take the mean from all sub-scan integration times).

Parameters:: spw_id (int) -- Numerical identifier of spectral window to select.
Returns:: Sub-scan integration time for given spectral window ID.
Return type:: timedelta