comparing-tclean-parameters.html

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         title="Permalink to Comparing tclean parameters">Comparing tclean parameters</a></h2>
 
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    <abbr class="published" title="2016-01-14T09:57:00-07:00">
      2016/01/14
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    <address class="vcard author">
      By <a class="url fn" href="https://keflavich.github.io/blog/author/adam-ginsburg-adamgginsburggmailcom.html">Adam Ginsburg (Adam.G.Ginsburg@gmail.com)</a>
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    <p>Comparing clean methods with identical data &amp; parameters (as far as possible):
<a class="reference external" href="https://github.com/keflavich/W51_ALMA_2013.1.00308.S/blob/master/script_merge/clean_method_comparison.py">code</a>.</p>
<p>An example using natural weighting:</p>
<img alt="" src="https://keflavich.github.io/blog/images/casa/tclean_compare.png" style="width: 600px;" />
<p>None of the methods are acceptable.  Multiscale is the worst, but hogbom is
extremely bad: there are major ringing artifacts (stripes parallel to the main
filament).</p>
<p>Disturbingly, even though I have given multiple scales, there are clearly no
non-pointlike scales in any of the model images, including mem, so I think
there's a major problem with tclean:</p>
<img alt="" src="https://keflavich.github.io/blog/images/casa/tclean_compare_models.png" style="width: 600px;" />
<p>I'm re-doing it with uniform weighting, because that's the case I was actually
interested in.</p>
<img alt="" src="https://keflavich.github.io/blog/images/casa/tclean_compare_uniform.png" style="width: 600px;" />
<p>The uniform tests come up with a clear and obvious answer: use clark clean, DO
NOT use any other methods as they are all unstable.</p>

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