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Basic Information on csflag
Task: csflag
Purpose: CARMA shadowing flagging
Categories: flagging
CSFLAG is a MIRIAD task which flags correlations where an array
of variable sized antennae could shadow each other.
An array of antenna diameters must be given, the number of antenna
must be exactly equal that in the dataset.
Although UVFLAG can also be used, the current visibility format
does not easily allow for variable sized antennae shadowing
calculations, and although this program was designed for CARMA,
it should work for any heterogenous array.
Note that this program only SETS flags, never unsets. Multiple
runs of csflag with decreasing values of cfraction= will thus
NOT have the effect you think it might have. Make a backup
of your flags/wflags files if you want to recover
Key: vis
The input visibility file to be flagged. No default.
Key: antdiam
Array of diameters (in m) for each antenna. By default
all antenna are the same, and equal the antdiam found in
the dataset. No default. See also carma= and sza= below
for a faster approach.
Default: not used
Key: carma
Boolean, if set to true, the default CARMA array is loaded
in the antdiam array. Also it is then assumed the first 6
are OVRO dishes (assumed 10.4m), the remaining 9 are BIMA
(assumed 6.1m), with an optional addition 8 for the SZA 3.5m
dishes.
If selected, it will also print out the number of records
flagged for O-O, B-B and O-B (labeled O/H/C).
The default is true.
Key: sza
Boolean, if set to to true, the default CARMA+SZA array is
loaded in the antdiam array. The last 8 antennas are 3.5m
SZA antennas. If given, if will override the carma setting.
The default is false.
Key: cfraction
Special CARMA option to multiply the antdiam array for
OVRO and BIMA dishes by. Two or three numbers are expected here,
depending if sza was set to true:
fraction for OVRO, that for BIMA, and optionally that for sza.
You normally want this leave this at 1, but can experiment with
smaller values to try and keep some partially shadowed data.
Default: 1,1,1