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The calibration analysis (ca) tool is a standardized interface to the new format (CASA 3.4 and later) calibration tables. It is designed to handle all types of tables, e.g., gain, bandpass, Tsys, etc. The ca tool takes advantages of newly implemented features in the CASA C++ code tree, e.g., iteration and parameter selection, which means that calibration tables can be accessed in a manner very similar to measurement sets.
The ca tool was originally designed to facilitate getting and/or processing data from an entire calibration table in an organized fashion so that the information could be written to other files. Additional features, e.g. introspective member functions, were added so that scripters and general users can easily employ the ca tool without using iteration (get one piece of data at a time).
Like the imaging tool (im), image analysis tool (ia), calibration tool (cb), etc., a native calibration analysis tool (ca) is created when CASA starts up. Other instances of the calibration analysis tool can be created, if required, using the command:
from casac import casac caLoc = casac.calanalysis()
More information about CASA may be found at the CASA web page
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