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NRAO Home > CASA > CASA Toolkit Reference Manual |
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imagepol.fractotpol - Function
1.1.4 Fractional total polarization
Description
This function returns the fractional linear polarization; ∕I.
You may optionally debias the polarized intensity. This requires the standard deviation of the thermal noise. You can either supply it if you know it, or it will be worked out for you with outliers from the mean clipped at the specified level.
If your image contains only Q and U, or only V, then just those components contribute to the total polarized intensity.
Arguments
Inputs |
| ||
debias |
| Debias the total polarized intensity ?
| |
| allowed: | bool | |
| Default: | false |
|
clip |
| Clip level for auto-sigma determination
| |
| allowed: | double | |
| Default: | 10.0 |
|
sigma |
| Standard deviation of thermal noise. Default is auto
determined.
| |
| allowed: | double |
|
| Default: | -1 |
|
outfile |
| Output image file name. Default is unset.
| |
| allowed: | string |
|
| Default: |
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image
Example
"""
#
print "\t----\t fractotpol Ex 1 \t----"
po.open(’stokes.image’)
ftp = po.fractotpol()
ftp.statistics()
ftp.done()
#
"""
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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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