Filter
“Filter on baseline and/or channel (only the given baselines/channels are kept). The reader step has an implicit filter.”
inputs
type
- type:
string- default:
filter- doc:
Case-insensitive step type; must be ‘filter’ .
baseline
- type:
string- default:
""- doc:
Baseline to keep using a selection string. See Description of baseline selection parameters.
blrange
- type:
array- default:
""- doc:
Baseline to keep using a range. See Description of baseline selection parameters.
corrtype
- type:
string- default:
""- doc:
Correlation type to match? Must be auto, cross, or an empty string .
nchan
- type:
integer- default:
0- doc:
Number of channels to use from the input MS (0 means till the end). It can be an expression with
nchan(nr of input channels) as parameter. E.g.15*nchan/16
remove
- type:
boolean- default:
False- doc:
If true, the stations not used in any baseline will be removed from the ANTENNA subtable and the antenna ids in the main table will be renumbered accordingly. To have a consistent output MeasurementSet, other subtables (FEED, POINTING, SYSCAL, LOFAR_ANTENNA_FIELD, LOFAR_ELEMENT_FAILURE, and QUALITY_BASELINE_STATISTIC) will also be updated. Note that stations filtered previously (e.g. using msselect) will also be removed, even if no baseline selection is done in the filter step .
startchan
- type:
integer- default:
0- doc:
First channel to use from the input MS (channel numbers start counting at 0). Note that skipped channels will not be written into the output MS. It can be an expression with
nchan(nr of input channels) as parameter. E.g.nchan/32will be fine for LOFAR observations with 64 and 256 channels.
step_name
- type:
string- default:
filter- doc:
unique name for the step .