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casa
$Rev:20696$
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Public Member Functions | |
| def | __init__ |
| def | __call__ |
Private Attributes | |
| __bases__ | |
| __doc__ | |
Static Private Attributes | |
| string | __name__ |
Definition at line 18 of file sdimaging_pg.py.
| def sdimaging_pg.sdimaging_pg_.__init__ | ( | self | ) |
Definition at line 21 of file sdimaging_pg.py.
| def sdimaging_pg.sdimaging_pg_.__call__ | ( | self, | |
infile = None, |
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specunit = None, |
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restfreq = None, |
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scanlist = None, |
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field = None, |
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spw = None, |
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antenna = None, |
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stokes = None, |
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gridfunction = None, |
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convsupport = None, |
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truncate = None, |
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gwidth = None, |
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jwidth = None, |
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outfile = None, |
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overwrite = None, |
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imsize = None, |
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cell = None, |
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dochannelmap = None, |
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nchan = None, |
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start = None, |
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step = None, |
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phasecenter = None, |
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ephemsrcname = None, |
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pointingcolumn = None, |
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async = None |
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| ) |
SD task: imaging for total power and spectral data
Keyword arguments:
infile -- name of input SD (MS) dataset
specunit -- units for spectral axis
options: (str) 'channel','km/s','GHz','MHz','kHz','Hz'
default: 'channel'
example: this will be the units for nchan, start, and step
restfreq -- rest frequency
default: '' (refer input data)
example: 1.0e11, '100GHz'
scanlist -- list of scan numbers to process
default: [] (use all scans)
example: [21,22,23,24]
this selection is in addition to field and spw
field -- field id or selection string for selecting scans by name
default: -1 (all fields)
example: 'FLS3a', 0
this selection is in addition to scanlist and spw
spw -- spectral window id
default: 0
example: 1
this selection is in addition to scanlist and field
antenna -- select data based on antenna name(s) or id(s)
default: -1 (all baselines, i.e. all antenna in case of auto data)
example: 0, 'DV01'
stokes -- select data based on stokes or polarization type
default: '' (use all polarizations)
example: 'XX'
gridfunction -- gridding function for imaging
options: 'BOX' (Box-car), 'SF' (Spheroidal),
'PB' (Primary-beam), 'GAUSS' (Gaussian),
'GJINC' (Gaussian*Jinc)
default: 'BOX'
example: 'SF'
>>> gridfunction expandable parameter:
convsupport -- convolution support for 'SF'
default: -1 (use default for each gridfunction)
example: 3
truncate -- truncattion radius of convolution kernel.
effective only for 'GAUSS' and 'GJINC'.
default: '-1' (use default for each gridfunction)
example: 3, '20arcsec', '3pixel'
gwidth -- HWHM for gaussian. Effective only for
'GAUSS' and 'GJINC'.
default: '-1' (use default for each gridfunction)
example: 3, '20arcsec', '3pixel'
jwidth -- Width of jinc function. Effective only for
'GJINC'.
default: '-1' (use default for each gridfunction)
example: 3, '20arcsec', '3pixel'
outfile -- output image name
default: none
example: 'mySDimage.im'
overwrite -- overwrite option for outfile
default: False (not overwrite)
options: True, False
example: if True, existing file will be overwritten
imsize -- x and y image size in pixels, symmetric for single value
default: [256,256]
example: imsize=200 (equivalent to [200,200])
cell -- x and y cell size. default unit arcmin
default: ['1.0arcmin', '1.0arcmin']
example: cell=['0.2arcmin, 0.2arcmin']
cell='0.2arcmin' (equivalent to example above)
dochannelmap -- channel map image or total power image
default: False (total power)
options: True (channel map), False
>>> dochannelmap=True expandable parameters
nchan -- number of spectral channel for created image
default: 1
example: 100
start -- reference value of start channel (in units of specunit)
default: 0 (0th channel if specunit='channel')
example: 100
step -- width of each spectral channel for created image
default: 1 (width of 1 channel if specunit='channel')
example: 100
phasecenter -- image phase center: direction measure or fieldid
default: 0
example: 'J2000 13h44m00 -17d02m00', 'AZEL -123d48m29 15d41m41'
ephemsrcname -- ephemeris source name for moving source
default: ''
if the source name in the data matches one of the known
solar objects by the system, this task automatically set
the source name.
example: 'moon'
pointingcolumn -- pointing data column to use
option: 'direction', 'target', 'pointing_offset', 'source_offset', 'encoder'
default: 'direction'
DESCRIPTION:
Task sdimaging create image from input single-dish data.
The input can be either total power and spectral data. Currently,
this task directly accesses the Measurement Set data only because of
the data access efficiency. So it differs from other single-dish
tasks that mostly operate on the ASAP scantable data format.
Units of spectral axis can be specified via a parameter specunit.
Allowed values for specunit are 'channel', 'GHz', 'MHz', 'kHz', 'Hz',
and 'km/s'. This parameter is also used as the units of the parameter
start and step that specify reference value of start channel and
width of each spectral channel for channel map, respectively.
The parameter nchan specifies number of channels for created image.
If you set nchan as -1, the task selects existing all channels and
combine those data into one channel to create continuum image.
You can specify field id or name directly. By default, field is set
to -1 that means the task selects all fields in the data.
Selection of the antennas can be made by setting antennaid(s) or
antenna name(s) in string (e.g. '0', 'DV01',etc.) or integer
(e.g. 0). Defalut value, -1, means that the task selects data from
all baseline, i.e., data from all antenna when data only contains
auto-correlation.
The parameter gridfunction sets gridding function for imaging.
Currently, the task supports 'BOX' (Box-car), 'SF' (Prolate
Spheroidal Wave Function), 'GAUSS' (Gaussian), 'GJINC' (Gaussian*
Jinc), where Jinc(x) = J_1(pi*x/c)/(pi*x/c) with a first order
Bessel function J_1, and 'PB' (Primary Beam). For 'PB', correct
antenna informations should be included in input file.
There are four subparameters for gridfunction: convsupport, truncate,
gwidth, and jwidth. The convsupport is an integer specifying cut-off
radius for 'SF' in units of pixel. By default (convsupport=-1),
the cut-off radius is set to 3 pixels. The truncate is a cut-off
radius for 'GAUSS' or 'GJINC'. It accepts integer, float, and
string values of numeric plus unit. Allowed units are angular
units such as 'deg', 'arcmin', 'arcsec', and 'pixel'. Default unit
is 'pixel' so that string without unit or numerical values (integer
or float) will be interpreted as radius in pixel. Default value
for truncate, which is used when negative radius is set, is 3*HWHM
for 'GAUSS' and radius at first null for 'GJINC'. The gwidth is
the HWHM of gaussian for 'GAUSS' and 'GJINC'. Default value is
sqrt(log(2)) pixel for 'GAUSS' and 2.52*sqrt(log(2)) pixel for
'GJINC'. The jwidth specifies width of the jinc function (parameter
'c' in the definition above). Default is 1.55 pixel. Both gwidth
jwidth allows integer, float, or string of numeric plus unit.
Default values for gwidth and jwidth are taken from Mangum et al.
(2007).Definition at line 26 of file sdimaging_pg.py.
References publish_summary.quantity, and vla_uvfits_line_sf.verify.
sdimaging_pg.sdimaging_pg_.__bases__ [private] |
Definition at line 22 of file sdimaging_pg.py.
sdimaging_pg.sdimaging_pg_.__doc__ [private] |
Definition at line 23 of file sdimaging_pg.py.
string sdimaging_pg.sdimaging_pg_.__name__ [static, private] |
Definition at line 19 of file sdimaging_pg.py.
1.8.0