UV_FIELDS

##
UV_FIELDS

            [CLEAN\]UV_FIELDS RaVar DecVar [Unit] [/CENTER Ra Dec] /FILE File

            Replace fields ID by Fields offsets in a Mosaic UV Table.  This  can
        only  work  for  a  Mosaic UV table with Fields offsets, or Phase center
        offsets. It cannot operate on a UV table with Pointing center offsets.

        For files imported from UVFITS, the Fields offsets are found in the AIPS
        SU  Table which is not decoded by the FITS command, but only through the
        DEFINE FITS command.

        The UV_FIELDS command allows to convert the Field IDs column of  the  UV
        table  into  Phase  Offsets  columns, and insert the proper coordinates.
        Unit specifies the unit of the RaVar and DecVar variables. It can be DE-
        GREE, MINUTE, SECONDS, RADIAN or ABSOLUTE.

        If  ABSOLUTE,  RaVar and DecVar are assumed to character variable arrays
        handling the Right Ascension and Declinations of the fields expressed in
        sexagesimal format.

        The  typical  use  is  after  a DEFINE FITS A File.uvfits command, which
        gives the  (Ra,Dec)  positions  of  the  field  centers  in  Degrees  in
        A%aips_su%col%raepo and A%aips_su%col%decepo variables:

            fits File.uvfits to File.uvt
            define fits A File.uvfits
            define double ra dec
            define char*16 cra cdec
            let cra ra /sexag d H
            let cdec dec /sexag d d
            compute ra mean a%aips_su%col%raepo
            compute dec mean a%aips_su%col%decepo
            !
            uv_fields a%aips_su%col%raepo a%aips_su%col%decepo DEGREE -
              /FILE File.uvt /CENTER 'CRa' 'CDec'
            !
        This  command  is used in the fits_to_uvt.ima script. Note that a proper
        use also requires to set the reference coordinate to Ra and Dec  consis-
        tently in the UV Table.

Subsections

- UV_FIELDS /CENTER
- UV_FIELDS /FILE