NRAO Home > CASA > CASA Toolkit Reference Manual
Overview of imager tool functions:
Data access
open, close, done
Data selection
??
Data editing
clipvis
Data calibration
??
Data examination
plotvis, plotuv, plotweights, plotsummary
Weighting
weight, filter, uvrange, sensitivity, fitpsf, plotweights
Image definition
advise, ??, make
Imaging
makeimage, clean, nnls, mem, ??, restore, residual, approximatepsf, fitpsf, setbeam, ft, smooth, feather, makemodelfromsd
Masks
mask, boxmask, regionmask, exprmask, clipimage
Miscellaneous
summary, setoptions, setoptions, setoptions

Example The following example shows the quickest way to make a CLEAN image and display it. Note that this can be more easily done from the ??.

include ’imager.g’  
#  
# First make the MS from a FITS file:  
#  
m:=fitstoms(msfile=’3C273XC1.MS’, fitsfile=’3C273XC1.FITS’); m.close();  
#  
# Now make an imager tool for the MS  
#  
imgr:=imager(’3C273XC1.MS’)  
#  
# Set the imager to produce images of cellsize 0.7 and  
# 256 by 256 pixels  
#  
imgr.setimage(nx=256,ny=256, cellx=’0.7arcsec’,celly=’0.7arcsec’);  
#  
# Wait for results before proceeding to the next step  
#  
dowait:=T  
#  
# Make and display a clean image  
#  
imgr.clean(niter=1000, threshold=’30mJy’,  
model=’3C273XC1.clean.model’, image=’3C273XC1.clean.image’)  
dd.image(’3C273XC1.clean.image’)  
#  
# Fourier transform the model  
#  
imgr.ft(model=’3C273XC1.clean.model’)  
#  
# Plot the visibilities  
#  
imgr.plotvis()  
#  
# Write out the final MS and close the imager tool  
#  
imgr.close()


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