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NRAO Home > CASA > CASA Toolkit Reference Manual |
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sd.linefinder.set_options - Function
5.1.6 Set the parameters of the line finding algorithm
Description
This method is used to set the parameters of the line finding algorithm. There
are six parameters that can be set by this method. See description of this
object for details about parameters.
Note that, for bad baselines, threshold should be increased, and avg_limit decreased (or even switched off completely by setting this parameter to 1) to avoid detecting baseline undulations instead of real lines.
Arguments
Inputs |
| ||
threshold |
| A single channel S/N ratio above which the channel is
considered to be a detection. | |
| allowed: | float |
|
| Default: | sqrt(3) |
|
min_nchan |
| A minimal number of consequtive channels, which
should satisfy a threshold criterion to be a detection.
| |
| allowed: | integer |
|
| Default: | 3 | |
avg_limit |
| A number of consequtive channels not greater than this
parameter can be averaged to search for broad lines.
| |
| allowed: | integer |
|
| Default: | 8 |
|
box_size |
| A running mean/median box size specified as a fraction
of the total spectrum length.
| |
| allowed: | float |
|
| Default: | 0.2 |
|
noise_box |
| Area of the spectrum used to estimate noise stats
| |
| allowed: | float, string (’all’ or ’box’) |
|
| Default: | ’all’ |
|
noise_stat |
| Statistics used to estimate noise
| |
| allowed: | string (’mean80’ or ’median’) |
|
| Default: | ’mean80’ |
|
Example
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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