msuvbin – grid the visibility data onto a defined uniform grid (in the form of an ms); multiple MS's can be done onto the same grid – calibration task

Description

msuvbin is a uv gridding task. The use is for large volumes of data (from multiple epochs) that needs to be imaged into one image. One way of proceeding is to image the epochs and average them after wards. Rather than doing this averaging the visibilities on a common uv grid has several convenience advantages like easily doing the proper weighted averaging and imaging. If an output grid already exists and a second ms is gridded on the grid then the output grid parameters is ignored but the existant grid is used.

Parameters

Title
Parameter	Default	Description
vis	`''`
field	`''`
spw	`''`
taql	`''`
outvis	`''`
phasecenter	`''`
nx	`int(1000)`
ny	`int(1000)`
cell	`'1arcsec'`
ncorr	`int(1)`
nchan	`int(1)`
fstart	`'1GHz'`
fstep	`'1kHz'`
wproject	`False`
memfrac	`float(0.5)`

Parameter Explanations

vis

''

Name of input visibility file (MS)

field

''

Field selection of input ms

spw

''

Spw selection

taql

''

TaQl string for data selection

outvis

''

name of output uvgrid

phasecenter

''

phase center of uv grid

nx

int(1000)

Number of pixels of grid along the x-axis

ny

int(1000)

Number of pixels of grid along the y-axis

cell

'1arcsec'

pixel cell size defined in sky dimension

ncorr

int(1)

number of correlations to store in grid

nchan

int(1)

Number of spectral channels in grid

fstart

'1GHz'

Frequency of first spectral channel

fstep

'1kHz'

spectral channel width

wproject

False

Do wprojection correction while gridding

memfrac

float(0.5)

Limit how much of memory to use