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Appendix I  CASA Dictionaries

BETA ALERT: These tend to become out of date as we add new tasks or change names.

I.1  AIPS – CASA dictionary

In Table I.1 we provide a comparison of CASA and AIPS commands. The data reduction recipes and break-down of jobs in individual tasks, however, is not the same in both packages. Nevertheless, the table may give AIPS users a good start if they search for functionality in CASA.

Table I.1: AIPS – CASA dictionary
AIPS TaskCASA task/toolDescription
APROPOStaskhelp List tasks with a short description of their purposes
BLCAL blcal Calculate a baseline-based gain calibration solution
BLCHN blcal Calculate a baseline-based bandpass calibration solution
BPASS bandpass Calibrate bandpasses
CALIB gaincal Calibrate gains (amplitudes and phases)
CLCAL applycal Apply calibration to data
COMB immath Combine images
CPASS bandpass Calibrate bandpasses by polynomial fitting
DBCON concat Concatenate u-v datasets
DEFAULT default Load a task with default parameters
FILLM importvla Import old-format VLA data
FITLD importuvfits Import a u-v dataset which is in FITS format
FITLD importfits Import an image which is in FITS format
FITTP exportuvfits Write a u-v dataset to FITS format
FITTP exportfits Write an image to FITS format
FRING Calibrate group delays and phase rates.
GETJY fluxscale Determine flux densities for other cals
GO go Run a task
HELP help Display the help page for a task
IMAGR clean Image and deconvolve
IMFIT imfit Fit gaussian components to an image
IMHEAD vishead View header for u-v data
IMHEAD imhead View header for an image
IMLIN imcontsub Subtract continuum in image plane
IMLOD importfits Import a FITS image
IMSTAT imstat Measure statistics on an image
INP inp View task parameters
JMFIT imfit Fit gaussian components to an image
LISTR listobs Print basic data
MCAT ls List image data files
MOMNT immoments Compute moments from an image
OHGEO imregrid Regrids an image onto another image’s geometry
PBCOR immath Correct an image for the primary beam
PCAL polcal Calibrate polarization
POSSM plotcal Plot bandpass calibration tables
POSSM plotms Plot spectra
PRTAN listobs Print antenna locations
PRTAN plotants Plot antenna locations
QUACK flagdata Remove first integrations from scans
RENAME mv Rename an image or dataset
SETJY setjy Set flux densities for flux cals
SMOTH imsmooth Smooth an image
SNPLT plotcal Plot gain calibration tables
SPFLG viewer Flag raster image of time v. channel
SPLIT split Write out u-v files for individual sources
TASK inp Load a task with current parameters
TGET tget Load a task with parameters last used for that task
TVALL viewer Display image
TVFLG viewer Flag raster image of time v. baseline
UCAT ls List u-v data files
UVFIX fixvis Compute u, v, and w coordinates
UVFLG flagdata Flag data
UVLIN uvcontsub Subtract continuum from u-v data
UVLSF uvcontsub Subtract continuum from u-v data
UVPLT plotms Plot u-v data
UVSUB uvsub Subtracts model u-v data from corrected u-v data
WIPER plotms Plot and flag u-v data
ZAP rmtables Delete data files

I.2  MIRIAD – CASA dictionary

Table I.2 provides a list of common Miriad tasks, and their equivalent CASA tool or tool function names. The two packages differ in both their architecture and calibration and imaging models, and there is often not a direct correspondence. However, this index does provide a scientific user of CASA who is familiar with MIRIAD, with a simple translation table to map their existing data reduction knowledge to the new package.

Table I.2: MIRIAD – CASA dictionary
MIRIAD TaskDescriptionCASA task/tool
blflagInteractive baseline based editor/flaggermp raster displays
cgcursInteractive image analysisviewer
cgdispImage display, overlaysviewer
cleanClean an imageclean
fitsFITS image fillerimportfits, exportfits, importuvfits, exportuvfits
gpbootSet flux density scalefluxscale
gpcalPolarization leakage and gain calibrationgaincal
gpcopycopy calibration tablesnot needed
gppltPlot calibration solutionsplotcal
imcombImage combinationimmaths
imfitImage-plane component fitterimfit
impolCreate polarization imagesclean
imstatImage statisticsimstats
imsubExtract sub-imageia.subimage
invertSynthesis imagingclean
linmoslinear mosaic combination of imagesclean
mathsCalculations involving imagesimmath
mfcalBandpass and gain calibrationbandpass
prthdPrint header of image or uvdataimhead, listobs, vishead
restorRestore a clean component modelclean
selfcalselfcalibration of visibility dataclean, gaincal, etc.

I.3  CLIC – CASA dictionary

Table I.3 provides a list of common CLIC tasks, and their equivalent CASA tool or tool function names. The two packages are very similar since the CASA software to reduce IRAM data is based on the CLIC reduction procedures.

Table I.3: CLIC–CASA dictionary
CLIC FunctionDescriptionCASA task/tool
loadLoad dataimportfits, importasdm, importuvfits
printPrint text summary of datalistobs
flagFlag dataplotms, flagdata, viewer
phcorAtmospheric phase correctiongaincal
rfRadio frequency bandpassbandpass
phasePhase calibrationgaincal
fluxAbsolute flux calibrationsetjy, fluxscale
amplAmplitude calibrationgaincal
tableSplit out calibrated data (uv table)split

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