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One major step to allow this simplification has been the possibility offered by
the GDF UV data format version 2 to allow "extra" columns, i.e. additional data for
each visbility. We use it here to store several possible quantities
- column of type code_uvt_id contains a real (actually, only
integer values are to be found) representing a numerical identification number. This
typically handles the field number, for example, but the column type is generic.
- columns of types code_uvt_loff and code_uvt_moff
contain the phase offsets (from the phase center)
- columns of types code_uvt_xoff and code_uvt_yoff
contain the pointing offsets (from the pointing center).
If the phase offset columns are present, but the pointing offset columns
are not present, the pointing centers are assumed to be identical to the
phase centers. This naturally happens for data taken by all interferometers
(NOEMA, ALMA, JVLA, ...).
Subsections
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2023-06-01