Tools in CASA

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1.4.6 Tools in CASA

The CASA toolkit is the foundation of the functionality in the package, and consists of a suite of functions that are callable from Python. The tools are used by the tasks, and can be used by advanced users to perform operations that are not available through the tasks.

It is beyond the scope of this reference to describe the toolkit in detail. Occasionally, examples will be given that utilize the tools (e.g. § 6.17). In short, tools are always called as functions, with any parmeters that are not to be defaulted given as arguments. For example:

   ia.open(’ngc5921.chan21.clean.cleanbox.mask’)
   ia.calcmask(’"ngc5921.chan21.clean.cleanbox.mask">0.5’,’mymask’)
   ia.summary()
   ia.close()

uses the image tool (ia) to turn a clean mask image into an image mask. Tools never use the CASA global parameters.

To find what tools are available, use the toolhelp command:

---------> toolhelp()

Available tools:

at : Juan Pardo ATM library
cb : Calibration utilities
cl : Component list utilities
cp : Cal solution plotting utilities
cs : Coordinate system utilities
cu : Class utilities
dc : Deconvolver utilities
fg : Flagging/Flag management utilities
ia : Image analysis utilities
im : Imaging utilities
me : Measures utilities
ms : MeasurementSet (MS) utilties
mp : MS plotting (data (amp/phase) versus other quantities)
pm : PlotMS utilities
po : Imagepol utilities
rg : Region manipulation utilities
tb : Table utilities (selection, extraction, etc)
tp : Table plotting utilities
qa : Quanta utilities
sl : Spectral line import and search
tf : Test flagger utilities
sm : Simulation utilities
vp : Voltage pattern/primary beam utilties
---
pl : pylab functions (e.g., pl.title, etc)
sd : Single dish utilities
---

You can find much more information about the toolkit in the CASA User Reference Manual:

http://casa.nrao.edu/docs/casaref/CasaRef.html

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