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0.1.44 impbcor
Requires:
Synopsis
Construct a primary beam corrected image from an image and a primary
beam pattern.
Arguments
Inputs |
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imagename |
| Name of the input image
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| allowed: | string |
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| Default: |
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pbimage |
| Name of the primary beam image which must exist or
array of values for the pb response. Default ””
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| allowed: | any |
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| Default: | variant ”” | |
outfile |
| Output image name. If empty, no image is written.
Default ”” | |
| allowed: | string |
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| Default: |
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overwrite |
| Overwrite the output if it exists? Default False
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| allowed: | bool | |
| Default: | False |
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box |
| Rectangular region to select in direction plane. Default
is to use the entire direction plane.
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| allowed: | string |
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| Default: |
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region |
| Region selection. Default is to use the full image.
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| allowed: | any |
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| Default: | variant
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chans |
| Channels to use. Default is to use all channels.
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| allowed: | string |
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| Default: |
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stokes |
| Stokes planes to use. Default is to use all Stokes planes.
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| allowed: | string |
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| Default: |
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mask |
| Mask to use. Default is none.
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| allowed: | string |
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| Default: |
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mode |
| Divide or multiply the image by the primary beam
image. Minimal match supported. Default ”divide”
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| allowed: | string |
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| Default: | divide |
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cutoff |
| PB cutoff. If mode is ”d”, all values less than this will be
masked. If ”m”, all values greater will be masked. Less
than 0, no cutoff. Default no cutoff
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| allowed: | double |
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| Default: | -1.0 |
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stretch |
| Stretch the mask if necessary and possible?
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| allowed: | bool |
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| Default: | False |
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bool
Example
PARAMETER SUMMARY
imagename Name of the input (CASA, FITS, MIRIAD) image
pbimage Name of the image (CASA, FITS, MIRIAD) of the primary beam pattern or an array of pixel values.
outfile Name of output CASA image. Must be specified.
overwrite If output file is specified, controls if an already existing file by the
same name can be overwritten. If true, the user is not prompted, the file
if it exists is automatically overwritten.
box Rectangular region to select in direction plane. Default
is to use the entire direction plane.
region Region selection. Default is to use the full image.
chans Channels to use. Default is to use all channels.
stokes Stokes planes to use. Default is to use all Stokes planes.
mask Mask to use. Default is none.
stretch Stretch the input mask if necessary and possible.
mode Divide or multiply the image by the primary beam image. Minimal match supported. Default "divide"
cutoff PB cutoff. If mode is "d", all values less than this will be masked. If "m", all values greater will be masked. Less than 0, no cutoff. Default no cutoff
DESCRIPTION
Correct an image for primary beam attenuation using an image of the primary beam pattern.
The primary beam pattern can be provided as an image, in which case 1. it must have the same
shape as the input image and its coordinate system must be the same, or 2. it must
be a 2-D image in which case its coordinate system must consist of a (2-D) direction
coordinate which is the same as the direction coordinate in the input image and
its direction plane must be the same shape as that of the input image. Alternatively,
pbimage can be an array of pixel values in which case the same dimensionality and
shape constraints apply.
One can choose between dividing the image by the primary beam pattern (mode="divide") or
multiplying the image by the primary beam pattern (mode="multiply"). One can also choose
to specify a cutoff limit for the primary beam pattern. For mode="divide", for all pixels
below this cutoff in the primary beam pattern, the output image will be masked. In the
case of mode="multiply", all pixels in the output will be masked corresponding to pixels
with values greater than the cutoff in the primary beam pattern. A negative value for
cutoff means that no cutoff will be applied, which is the default.
EXAMPLE
impbcor(imagename="attunuated.im", pbimage="mypb.im", outname="pbcorred.im", mode="divide", cutoff=0.1)
More information about CASA may be found at the
CASA web page
Copyright © 2016 Associated Universities Inc., Washington, D.C.
This code is available under the terms of the GNU General Public Lincense
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