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imager.fixvis - Function

2.3.1 Performs visibility adjustments.


Description

Corrects UVW coordinates and optionally the visibilities for various effects that can be calculated without fitting a model to the data.

The effects include:

Arguments





Inputs

fields

Field IDs (numbered relative to 0) to operate on. Blank = all.

allowed:

intArray

Default:

-1

phasedirs

Phase tracking centers for each field in fields, in the same order.

allowed:

stringArray

Default:

refcode

Reference frame to use for the generated UVWs. WARNING: clean and the im tool ignore the reference frame claimed by the UVW column (it is often mislabelled as ITRF when it is really J2000) and instead assume the (u, v, w)s are in the same frame as the phase tracking center. calcuvw does not yet force the UVW column and field centers to use the same reference frame! Blank = use the phase tracking frame of vis.

allowed:

string

Default:

distances

A list of distances (in m) for the fields listed in fields. 0 = infinity.

allowed:

doubleArray

Default:

0.0

datacolumn

Which of DATA, MODEL_DATA, and/or CORRECTED_DATA to operate on. Default: ”all”.

allowed:

string

Default:

all

Returns
bool

Example

 
 
     im.open("3C273XC1.MS")  
     im.fixvis()  
     im.done()  
 

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