NRAO Home > CASA > CASA Toolkit Reference Manual
msmetadata.refdir - Function

1.3.2 Get the reference direction from a field ID and time if necessary


Description

Get a direction measure for the reference direction of the field and time specified

Arguments





Inputs

field

Zero-based field ID or field name for which to get the reference direction; default field=0

allowed:

any

Default:

variant 0

epoch

Optional time, expressed as a measures epoch dictionary, if associated field has a polynomial in time reference direction or an ephemerides table attached it. Default value means evaluate at the origin TIME in the FIELD table

allowed:

record

Default:

Returns
record

Example

 
    msmd.open("my.ms")  
    # get reference direction for field ID 1  
    mydir = msmd.refdir(1);  
    # if the reference direction is a polynomial or has an ephemerides attached to  
    # it a time is needed to get the reference direction  
    ep=me.epoch(’utc’, ’2015/03/15/15:30:55’)  
    mydir2=msmd.phasecenter(2, ep)  
    msmd.done()  

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