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Version 1.9 Build 1556

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dragon.filter - Function

	Package	synthesis
	Module	imager
	Tool	dragon

Apply filtering

Synopsis
filter(bmaj, bmin, bpa, async)

Description
Apply visibility tapering to emphasize certain scale structures. The imaging tapers are applied to a Table column called IMAGING_WEIGHT, which may be plotted using plotweights. In addition, this column may be accessed directly using either the table or ms modules. Note that the taper is multiplicative and so the weights must be calculated first using weight. The points are not flagged!

Note that the scale size to be emphasized is given in the image plane as the parameters of the correspondiong Gaussian.

Arguments

bmaj		Major axis of filter
		Allowed:	Quantity
		Default:	'0rad'
bmin		Minor axis of filter
		Allowed:	Quantiy
		Default:	'0rad'
bpa		Position angle of filter
		Allowed:	Quantity
		Default:	'0deg'
async		Run asynchronously in the background
		Allowed:	Bool
		Default:	!dowait

Returns
Bool

Example

drag.weight('uniform')
drag.filter(type='gaussian', bmaj='2.3arcsec', bmin='1.67arcsec',
bpa='-34.5deg')