imager - Tool

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2.3.1 imager - Tool

tool for synthesis imaging
Requires:

Synopsis

Description

imager is an tool that accomplishes synthesis processing. A imager must be constructed for each MeasurementSet for which one wishes to do processing. Multiple copies of imager may be made at any time (provide they are given different names).

Methods

imager	Construct an imager tool
advise	Advise (and optionally use) parameter values
advisechansel	Advise on spw and chan selection optimal for the image frequency range wanted
approximatepsf	Calculate approximate point spread functions
boxmask	Construct a mask image from blc, trc
calcuvw	Calculates (u, v, w) coordinates for the ms.
clean	Calculate a deconvolved image with selected clean algorithm
clipimage	Zero all pixels where Stokes I is below a threshold
clipvis	Flag visibilities where residual exceeds a threshold
close	Close the imager tool, with data written on disk, keeping imager process running for future use
defineimage	Set the image parameters for subsequent processing
done	Terminate the imager process
drawmask	Allows you do draw mask using the viewer
exprmask	Construct a mask image from a LEL expression
feather	Feather together an interferometer and a single dish image in the Fourier plane
filter	Apply additional weighting by filtering (u-v taper)
fitpsf	Fit the point spread function, making psf image first if needed
fixvis	Performs visibility adjustments.
ft	Fourier transform the specified model and componentlist
getweightgrid	get the requested weight grids

linearmosaic	Make a linear mosaic of several images
make	Make an empty (i.e. blank) image
predictcomp	Make a component list for a known object
makeimage	Calculate images by gridding, etc.
makemodelfromsd	Make an initial model image from a Single Dish image
mask	Construct a mask image by thresholding an image
mem	Calculate a deconvolved image with selected mem (maximum entropy) algorithm
nnls	Calculate a deconvolved image using the NNLS algorithm
open	Open a new MeasurementSet, for processing, closing current MeasurementSet
pb	Applies or corrects for a primary beam
plotsummary	Plot a summary of field and spectral window ids
plotuv	Plot the uv coverage
plotvis	Plot the visibility amplitudes as a function of u-v radius (also, see visplot tool
plotweights	Plot the visibility weights as a function of u-v radius
regionmask	Construct a mask image from a region
regiontoimagemask	union a mask image with various regions
residual	Calculate the residual image with respect to current model and component list
restore	Calculate the restored image with restored model, component list, and residuals
updateresidual	Calculate the residual and restored images with new modified model, component list,
sensitivity	Calculate rms sensitivity

apparentsens	Calculate rms sensitivity directly from weights
setbeam	Set the beam parameters for clean restoration
selectvis	Select visibilities for subsequent processing
setjy	Compute the model visibility for a specified source flux density
ssoflux	Use setjy instead.
setmfcontrol	Set various cycle control parameters for multi-field and wide-field imageing.
setoptions	Set some general options for subsequent processing
setscales	Set the scale sizes for MultiScale Clean
setsmallscalebias	Set bias toward smaller scales for MultiScale Clean
settaylorterms	Set the number of Taylor series terms for Multi-Frequency Clean
setsdoptions	Set some options for single dish processing
setvp	Set the voltage pattern model for subsequent processing
setweightgrid	set the requested weight grids
smooth	Calculate an image smoothed with a Gaussian beam
stop	stop the currently executing function asap
summary	Summarize the current state of the imager tool
uvrange	Select data within the limit of a given range
weight	Apply additional weighting to the visibility weights
mapextent	Compute map extent from given set of MSs
pointingsampling	Calculate Sampling interval of an MS

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