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Basic Information on uvwide
Task: uvwide
Purpose: Recompute wide band from narrow band
Categories: uv-data
UVWIDE is a MIRIAD task which allows you to
recompute the wide band data from the narrow band data.
It is also possible to reset the narrow band flags, based
on the wide band flags, and vice versa.
Note: this program used to be BIMA specific, where the first two
widebands were the global LSB/USB averages, CARMA uses nwide=nspect
and thus the program is now generally usable.
UVCAL can also be used to make wideband channels, using options=avechan.
WARNING: this program does not work on old BIMA data anymore where the
number of wide band channels was 2 more than the number of spectral
windows.
Key: vis
The name of the input visibility dataset.
No default.
Key: out
The name of the recomputed output visibility dataset. If no dataset
given, program will flag the wideband flags based on all the narrow
flags.
Default: none.
Key: reset
A logical that describes whether or not all wideband data is
recomputed. By default (reset=true), all wideband data is recomputed
regardless of the value of the previously existing wideband flags;
otherwise (reset=false), only wideband data with valid flags are
recomputed (i.e. data flagged bad are simply copied).
Default: true.
Key: narrow
A logical that describes if the narrow band data need to be
re-flagged, based on existing wide band flags. If set, the narrow
band flags that belong to a flagged wide band flag, are flagged.
Default: false.
Key: edge
If given, discard this number of edge channels of the spectral
windows.
Default: 0
Key: blankf
If given, discard this fraction of each edge from a spectral window.
At BIMA this fraction was 0.033.
Default: 0.0
Key: nwide
If used, and allowed, this will be the number of wide band channels
created when none are present in the input file. The channels used to
compute the wideband data are derived from the first 'nwide' spectral
windows (i.e. NWIDE.le. NSPECT). For fancy preprocessing, use UVAVER
before running UVWIDE with the NWIDE= option.
** PJT/LGM experimental code **