sdgrid – SD gridding task – single dish task

Description

Task sdgrid performs spatial gridding according to the user specification of spatial grid, convolution function, etc. For grid configuration, the task supplements necessary information by referring input data if any of gridding parameter (‘npix’, ‘cell’, or ‘center’) is not specified by the user. If ‘center’ is default value (empty string), central position of the grid will be set to the center of observed area, i.e. x=0.5*(xmax+xmin), y=0.5*(ymax+ymin). If either ‘cell’ or ‘npix’ is set, unspecified one will be calculated from the others. In that case, total extent of the grid will be set to cover all observed position. If neither ‘cell’ nor ‘npix’ is set, cell size will be set to 1.0 arcmin and number of pixel will be calculated based on that cell size. Currently, only J2000 frame is supported.

Parameters

Title

Parameter	Default	Description
infiles	numpy.array( [  ] )
antenna	int(-1)
spw	'-1'
scan	''
pol	''
gridfunction	'BOX'	gridding function for imaging ['box','sf','pb','gauss', or 'gjinc']
convsupport	int(-1)
truncate	int(-1)
gwidth	int(-1)
jwidth	int(-1)
weight	'UNIFORM'	weight type ['uniform','tint','tsys', or 'tintsys']
clipminmax	False
outfile	''
overwrite	False
npix	int(-1)
cell	''
center	''
plot	False

Parameter Explanations

infiles

numpy.array( [  ] )

a list of names of input SD datasets

antenna

int(-1)

select an antenna name or ID, e.g. 'PM03' (only effective for MS input)

spw

'-1'

select data by IF IDs (spectral windows), e.g. '3,5,7' (''=all)

scan

''

select data by scan numbers, e.g. '21~23' (''=all)

pol

''

select data by polarization IDs, e.g. '0,1' (''=all)

gridfunction

'BOX'

gridding function for imaging

convsupport

int(-1)

truncate of convolution kernel

truncate

int(-1)

truncation radius of convolution kernel

gwidth

int(-1)

HWHM for gaussian

jwidth

int(-1)

c-parameter for jinc function

weight

'UNIFORM'

weight type

clipminmax

False

clip minimum and maximum values during gridding

outfile

''

name of output file

overwrite

False

overwrite the output file if already exists [True, False]

npix

int(-1)

number of pixels in x and y, symmetric for single value

cell

''

x and y cell size. default unit arcsec

center

''

Image center

plot

False

Plot result or not