PreFlagger
Flag given baselines, time slots, etc.
inputs
type
- type:
string- default:
preflagger- doc:
Case-insensitive step type; must be ‘preflagger’ (or ‘preflag’) .
abstime
- type:
string[]- doc:
Ranges of absolute UTC date/time given as st..end or val+-delta. Each value (except delta) must be given as a date/time in casacore MVTime format, for instance 12-Mar-2010/11:31:00.000. A delta value must be given as a time (for instance 1:30:0 or 20s) .
- default:
[]
amplmax
- type:
float- default:
1e+30- doc:
Correlation data with amplitude > amplmax will match .
amplmin
- type:
float- default:
-1e+30- doc:
Correlation data with amplitude < amplmin will match. It can be given per correlation. For example,
amplmin=[100,,,100]matches data points with XX or YY amplitude < 100. The non-specified amplitudes get the default value.
azimuth
- type:
float[]- default:
[]- doc:
Ranges of azimuth angles given as st..end or val+-delta. Each value has to be given as a casacore direction like 12:34:56.789 or 12h34m56.789, 12.34.56.789 or 12d34m56.789, or a value followed by a unit like rad or deg .
baseline
- doc:
- type:
string[]- default:
[]
blmax
- type:
float- default:
-1- doc:
If blmax > 0, baselines with length > blmax meter will match .
blmin
- type:
float- default:
-1- doc:
If blmin > 0, baselines with length < blmin meter will match .
chan
- type:
string- default:
""- doc:
The given channels will match (start counting at 0). Channels exceeding the number of channels are ignored. Similar to
msin, it is possible to specify the channels as an expression ofnchan. Furthermore,..can be used to specify ranges. For example:chan=[0..nchan/32-1, 31*nchan/32..nchan-1]to flag the first and last 2 or 8 channels (depending on 64 or 256 channels in the observation).
corrtype
- type:
string- default:
""- doc:
Correlation type to match? Must be auto, cross, or an empty string .
count.path
- type:
string?- doc:
The directory where to create the flag percentages table. If empty, the path of the input MS is used .
count.save
- type:
boolean- default:
False- doc:
If true, the flag percentages per frequency are saved to a table with extension
.flagfreqand percentages per station to a table with extension.flagstat. The basename of the table is the MS name (without extension) followed by the stepname and extension.
elevation
- type:
string?- doc:
Ranges of elevation angles (similar to azimuth). For example: 0deg..10deg
expr
- type:
string?- default:
""- doc:
Expression of preflagger keyword sets (see above). Operators AND, OR, and NOT are possible (or their equivalents &&,&, ||, |, and !). Parentheses can be used to change precedence order. For example:
c1 and (c2 or c3)
freqrange
- type:
string- default:
""- doc:
Channels in the given frequency ranges will match. Each value in the vector is a range which can be given as start..end or start+-delta. A value can be followed by a unit like KHz. If only one value in a range has a unit, the unit is also applied to the other value. If a range has no unit, it defaults to MHz. For example:
freqrange=[1.2 .. 1.4 MHz, 1.8MHz+-50KHz]flags channels between 1.2MHz and 1.4MHz and between 1.75MHz and 1.85MHz. The example shows that blanks can be used at will.
imagmax
- type:
float- default:
1e+30- doc:
Correlation data with imaginary complex part > imagmax will match .
imagmin
- type:
float- default:
-1e+30- doc:
Correlation data with imaginary complex part < imagmin will match .
lst
- type:
string[]- default:
[]- doc:
Ranges of Local Apparent Sidereal Times like 1:30:0 +- 20min. The LST of a time slot is calculated for the array position, thus not per antenna.
mode
- type:
string- default:
set- doc:
Case-insensitive string telling what to do with the flags of the data matching (or not matching) the selection criteria given in the other parameters. Must be ‘set’, ‘setcomplement’/’setother’, ‘clear’ or ‘clearcomplement’/’clearother’ .
phasemax
- type:
float- default:
1e+30- doc:
Correlation data with phase > phasemax (in radians) will match .
phasemin
- type:
float- default:
-1e+30- doc:
Correlation data with phase < phasemin (in radians) will match .
realmax
- type:
float- default:
1e+30- doc:
Correlation data with real complex part > realmax will match .
realmin
- type:
float- default:
-1e+30- doc:
Correlation data with real complex part < realmin will match .
reltime
- type:
string[]- default:
[]- doc:
Ranges of times (using .. or +-) since the start of the observation. A time can be given like 1:30:0 or 20s .
step_name
- type:
string- default:
preflag- doc:
unique name for the step .
timeofday
- type:
string?- default:
[]- doc:
Ranges of UTC time-of-day given as st..end or val+-delta. Each value must be given as 12:34:56.789, 12h34m56.789, or as a value followed by a unit like h, min, or s .
timeslot
- type:
string[]- default:
[]- doc:
Time slot sequence numbers. First time slot is 0. st..end means end inclusive .
uvmmax
- type:
float- default:
-1- doc:
If uvmmax > 0, baselines with UV-distance > uvmmax meter will match .
uvmmin
- type:
float- default:
-1- doc:
If uvmmin > 0, baselines with UV-distance < uvmmin meter will match. Note that the UV-distance is the projected baseline length .