listvis – List measurement set visibilities. – information, analysis task

Description

This task lists measurement set visibility data under a number of input selection conditions. The measurement set data columns that can be listed are: the raw data, float_data, corrected data, model data, and residual (corrected - model) data.

The output table format is dynamic. Field, Spectral Window, and Channel columns are not displayed if the column contents are uniform. For example, if “spw = ‘1’” is specified, the spw column will not be displayed. When a column is not displayed, a message is sent to the logger and terminal indicating that the column values are uniform and listing the uniform value.

Table column descriptions:

COLUMN NAME DESCRIPTION ———– ———– Date/Time Time stamp of data sample (YYMMDD/HH:MM:SS UT) Intrf Interferometer baseline (antenna names) UVDist uv-distance (units of wavelength) Fld Field ID (if more than 1) SpW Spectral Window ID (if more than 1) Chn Channel number (if more than 1) (Correlated Correlated polarizations (eg: RR, LL, XY)

polarization) Sub-columns are: Amp, Phs, Wt, F

Amp Visibility amplitude Phs Visibility phase (deg) Wt Weight of visibility measurement F Flag: ‘F’ = flagged datum; ‘ ‘ = unflagged UVW UVW coordinates (meters)

Input Parameters: vis Name of input visibility file

default: none; example: vis=’ngc5921.ms’

options List options: default = ‘ap’

Not yet implemented for suboptions

datacolumn Visibility file data column:

default = ‘data’: options are data, float_data, corrected, model, residual (corrected-model)

field Select data based on field id(s) or name(s)

default: ‘’==>all; example: field=’1’ field=’0~2’ field ids inclusive from 0 to 2 field=’3C*’ all field names starting with 3C

spw Select spectral window, channel to list

default: ‘0:0’ –> spw=0, chan=0 spw=’2:34’ spectral window 2, channel 34

selectdata Toggle the following 7 selection parameters.

default: False; example: selectdata=True If false, the following parameters are reset to default values.

antenna Select calibration data based on antenna: default: ‘’–>all; examples: antenna = ‘5,6’; antenna index 5 and 6 solutions antenna = ‘05,06’; antenna names ‘05’ and ‘06 solutions
timerange Select time range to list: default: ‘’–>all; examples: timerange=’10:37:50.1’; list data for this sampling interval timerange=’<10:37:25’; list data before 10:37:25
correlation Select polarization correlations to list: default: ‘’–>all; examples: correlation=’RR LL’; list RR and LL correlations correlation=’XX XY’; list XX and XY correlations
scan Select scans to list: default: ‘’–>all; examples: scan=’2’; list scan 2 scan=’>2’; list scan numbers greater than 2

feed (not yet implemented)

array (not yet implemented)

observation Select by observation ID.

uvrange Select baseline lengths to list.: default: ‘’–> all; examples: uvrange=’<5klambda’; less than 5 kilo-wavelengths Caution: Input units default to meters. Listed units are always wavelengths.

average (not yet implemented)

showflags (not yet implemented)

pagerows rows per page of listing: default: 50; 0 –> do not paginate
listfile write output to disk; will not overwrite: default: ‘’ –> write to screen listfile = ‘solutions.txt’
async Run asynchronously: default = False; do not run asychronously

Parameters

Title
Parameter	Default	Description
vis	`''`
options	`'ap'`
datacolumn	`'data'`
field	`''`
spw	`'*'`
selectdata	`False`
antenna	`''`
timerange	`''`
correlation	`''`
scan	`''`
feed	`''`
array	`''`
observation	`''`
uvrange	`''`
average	`''`
showflags	`False`
pagerows	`int(50)`
listfile	`''`

Parameter Explanations

vis

''

Name of input visibility file

options

'ap'

List options: ap only

datacolumn

'data'

Column to list: data, float_data, corrected, model, residual

field

''

Field names or index to be listed

spw

'*'

Spectral window channels

selectdata

False

Other data selection parameters

antenna

''

Antenna/baselines

timerange

''

Time range

correlation

''

Correlations

scan

''

Scan numbers

feed

''

Multi-feed numbers (Not yet implemented)

array

''

Array numbers (Not yet implemented)

observation

''

Select by observation ID(s)

uvrange

''

uv range

average

''

Averaging mode

showflags

False

Show flagged data (Not yet implemented)

pagerows

int(50)

Rows per page

listfile

''

Output file