sdimprocess_pg.sdimprocess_pg_ Class Reference

List of all members.

Public Member Functions
def	__init__
def	__call__
Private Attributes
	__bases__
	__doc__
Static Private Attributes
string	__name__

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Detailed Description

Definition at line 18 of file sdimprocess_pg.py.

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Constructor & Destructor Documentation

def sdimprocess_pg.sdimprocess_pg_.__init__

(

self

)

Definition at line 21 of file sdimprocess_pg.py.

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Member Function Documentation

def sdimprocess_pg.sdimprocess_pg_.__call__	(		self,
			infiles = None,
			mode = None,
			numpoly = None,
			beamsize = None,
			smoothsize = None,
			direction = None,
			masklist = None,
			tmax = None,
			tmin = None,
			outfile = None,
			overwrite = None,
			async = None
	)

SD task: task for single-dish image processing
  Keyword arguments:
infiles -- name of input SD (FITS or CASA) image
mode -- processing mode
default: 'basket'
options: 'basket', 'press'

    >>>mode expandable parameter
 direction -- scan direction in unit of degree
     default: []
     example: [0.0,90.0]
 masklist -- mask width for Basket-Weaving on percentage
     default: 1.0 (1.0% of map size)
 numpoly -- order of polynomial fit in Presssed-out
     default: 2
 beamsize -- beam size 
     default: 0.0
     example: 10.0 (interpreted as '10arcsec'), '1arcmin'
 smoothsize -- smoothing beam in Pressed-out
     default: 2.0 (interpreted as 2.0 * beamsize)
     example: '1arcmin' (set smoothsize directly)

tmax -- maximum value used for process
default: 0.0 (no threshold in maximum)
example: 10.0 (mask data larger value than 10.0)
tmin -- minimum value used for process
default: 0.0 (no threshold in minimum)
example: -10.0 (mask data smaller value than -10.0)
outfile -- output CASA image name
default: '' (use default name)
example: 'output.im'
overwrite -- overwrite option for outfile
default: False (not overwrite)
options: True, False
example: if True, existing file will be overwritten


DESCRIPTION:

Task sdimprocess is used to remove a scanning noise that appears 
as a striped noise pattern along the scan direction in a raster 
scan data. 

By default, the scanning noise is removed by using the 
'Basket-Weaving' method (Emerson & Grave 1988) that requires 
multiple images that observed exactly the same area with different 
scanning direction. If only one image is available, the 'Pressed-out' 
method (Sofue & Reich 1979) can be used to remove the scanning 
effect.

For 'Basket-Weaving', scanning directions must have at least two 
different values. Normally, the scanning direction should be 
specified for each input image. Otherwise, specified scanning 
directions will be used iteratively. The masklist is a width of 
masking region in the Fourier plane. It is specified as a fraction 
(percentage) of the image size. 

For 'Pressed-out', the scanning direction must be unique. There are 
two ways to specify a size of smoothing beam used for process. One 
is to specify smoothing size directly. To do this, smoothsize should 
be specified as string that consists of a numerical value and an unit 
(e.g. '10.0arcsec'). A value of beamsize will be ignored in this case. 
Another way to specify smoothing size is to set an observed beam size 
and indicate smoothing size as a scale factor of the observed beam 
size. In this case, the beamsize is interpreted as the observed beam 
size, and the smoothsize is the scale factor. If the beamsize is 
provided as float value, its unit is assumed to 'arcsec'. It is also 
possible to set the beamsize as string consisting of the numerical 
value and the unit. The smoothsize must be float value.

The infiles only allows an image data (CASA or FITS), and not does
not work with MS or Scantable. The direction is an angle with respect 
to the horizontal direction, and its unit is degree. Any value may be 
interpreted properly, but the value ranging from 0.0 to 180.0 will be 
secure. The tmax and the tmin is used to specify a threshold that 
defines a range of spectral values used for processing. The data point 
that has the value larger than tmax or smaller than tmin will be 
excluded from the processing. The default (0.0) is no threshold. 
The outfile specifies an output CASA image name. If the outfile is 
empty, the default name ('sdimprocess.out.im') will be used. 

Definition at line 26 of file sdimprocess_pg.py.

References vla_uvfits_line_sf.verify.

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Member Data Documentation

sdimprocess_pg.sdimprocess_pg_.__bases__ [private]

Definition at line 22 of file sdimprocess_pg.py.

sdimprocess_pg.sdimprocess_pg_.__doc__ [private]

Definition at line 23 of file sdimprocess_pg.py.

string sdimprocess_pg.sdimprocess_pg_.__name__ [static, private]

Definition at line 19 of file sdimprocess_pg.py.

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The documentation for this class was generated from the following file:

• sdimprocess_pg.py