Field

class Field(field_id: int, name: str, source_id: int, time: NDArray, direction: DirectionDict)

Bases: object

A logical representation of a field in a MeasurementSet.

id

Numerical identifier of this field within the FIELD subtable of the MeasurementSet.

source_id

ID of the source associated with this field.

time

Array of unique observation times for this field.

name

Name of this field, formatted for use as a CASA argument.

intents

Set of unique scan intents associated with this field.

states

Set of unique State objects associated with this field.

valid_spws

Set of unique SpectralWindow objects associated with this field.

flux_densities

Set of unique flux measurements from setjy.

Attributes Summary

clean_name	Get the field name with illegal characters replaced with underscores.
dec	Return declination for the phasecenter of the field.
frame	Return reference frame code for the Field.
gb	Return declination for the phasecenter of the field.
gl	Return longitude for phasecenter of the field, in DMS format.
identifier	A human-readable identifier for this Field.
latitude	Return latitude for the phasecenter of the field.
longitude	Return longitude for the phasecenter of the field.
mdirection	Return direction measure dictionary for phasecenter of the field.
name	Return name of field, in form that can be used as a CASA argument.
ra	Return right ascension for the phasecenter of the field.
telmjd	Return the Modified Julian Date in a CASA epoch measure dictionary
zd	Return the zenith distance in a CASA quantity quanta dictionary.

Methods Summary

set_source_type(source_type)	Update the intent(s) associated with the field based on given source type(s).
set_zd_telmjd(observatory)	Calculate and set the zenith distance at the observation mid-time.

Attributes Documentation

clean_name

Get the field name with illegal characters replaced with underscores.

This property is used to determine whether the field name, when given as a CASA argument, should be enclosed in quotes.

dec

Return declination for the phasecenter of the field.

frame

Return reference frame code for the Field.

gb

Return declination for the phasecenter of the field.

gl

Return longitude for phasecenter of the field, in DMS format.

identifier

A human-readable identifier for this Field.

latitude

Return latitude for the phasecenter of the field.

longitude

Return longitude for the phasecenter of the field.

mdirection

Return direction measure dictionary for phasecenter of the field.

name

Return name of field, in form that can be used as a CASA argument.

ra

Return right ascension for the phasecenter of the field.

telmjd

Return the Modified Julian Date in a CASA epoch measure dictionary

zd

Return the zenith distance in a CASA quantity quanta dictionary.

Methods Documentation

set_source_type(source_type: str) → None

Update the intent(s) associated with the field based on given source type(s).

Source types from VLA datasets are translated to equivalent ALMA Pipeline intents.

Parameters:

source_type -- String containing the source type(s) (aka intents) associated with the field.

set_zd_telmjd(observatory: str) → None

Calculate and set the zenith distance at the observation mid-time.

Parameters:

observatory -- Name of the observatory (e.g., 'VLA', 'ALMA').