National Radio
Astronomy Observatory

5.2.12 Parameter vis

The value of the vis parameter is either the name of a single MS, or a list of strings containing the names of multiple MSs, that should be processed to produce the image. The MS referred to by the first name in the list (if more than one) is used to determine properties of the image such as channelization and rest frequency.

For example,

set a single input MS, while

points to three separate measurement sets that will be gridded together to form the image. This means that you do not have to concatenate datasets, for example from different configurations, before imaging.

For the multiple MS case, all selection commands like field, spw, etc. are lists that refer to the list of input MSs, like

will use the first entry of each selection criterion and apply it to the first dataset (spw=’1:2~9’ and field=’0’ to ’ngc5921_day1.ms’), the second selection criterion to the second dataset etc.

More information about CASA may be found at the CASA web page

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