get_calstate_shape

get_calstate_shape(ms: MeasurementSet)

Get an IntervalTree shaped to the dimensions of the given measurement set.

This function calculates the size of each metadata dimension (spw; intent; field; antenna), creating and returning an IntervalTree shaped to match. The output of this function is used to trim a calibration applied globally in one or more dimensions to a valid data selection.

Output from this function is cached as it can take several seconds to calculate the result, which is done repeatedly when importing a calstate containing many entries.

Note: this assumes that shape of an MS never changes, which should be true; the number of spws, fields, ants, etc. never changes.

Parameters:

ms -- The MeasurementSet to analyse.

Returns:

IntervalTree shaped to match valid data dimensions.