BETA ALERT: These tend to become out of date as we add new tasks or change names.
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.
AIPS Task CASA task/tool Description APROPOS taskhelp 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
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.
MIRIAD Task Description CASA task/tool blflag Interactive baseline based editor/flagger mp raster displays cgcurs Interactive image analysis viewer cgdisp Image display, overlays viewer clean Clean an image clean fits FITS image filler importfits, exportfits, importuvfits, exportuvfits gpboot Set flux density scale fluxscale gpcal Polarization leakage and gain calibration gaincal gpcopy copy calibration tables not needed gpplt Plot calibration solutions plotcal imcomb Image combination immaths imfit Image-plane component fitter imfit impol Create polarization images clean imstat Image statistics imstats imsub Extract sub-image ia.subimage invert Synthesis imaging clean linmos linear mosaic combination of images clean maths Calculations involving images immath mfcal Bandpass and gain calibration bandpass prthd Print header of image or uvdata imhead, listobs, vishead restor Restore a clean component model clean selfcal selfcalibration of visibility data clean, gaincal, etc.
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.
CLIC Function Description CASA task/tool load Load data importfits, importasdm, importuvfits Print text summary of data listobs flag Flag data plotms, flagdata, viewer phcor Atmospheric phase correction gaincal rf Radio frequency bandpass bandpass phase Phase calibration gaincal flux Absolute flux calibration setjy, fluxscale ampl Amplitude calibration gaincal table Split out calibrated data (uv table) split