[Met_help] [rt.rap.ucar.edu #76423] History for MET Viewer: Creating Scatter Plots

[John Halley Gotway via RT]

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  Initial Request
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HI MET Help,

I would like to try making a scatter plot with MET Viewer to compare
forecast and observed fields.  A simple example:

http://www.cawcr.gov.au/projects/verification/scatterplot.gif

However I do not see a clear way to do this with MET Viewer.  Is there a
way that this can be done?

Thanks!
Jacob


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  Complete Ticket History
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Subject: MET Viewer: Creating Scatter Plots
From: John Halley Gotway
Time: Fri May 20 10:02:47 2016

Hi Jacob,

Unfortunately, METViewer cannot currently make scatter plots.
However, it
is on our radar, and we already have a development task defined for
this.
But I don't have a good idea of when it'll bubble to top of the
priority
list.

In the meantime, I can point you to a sample Rscript which reads the
MPR
(matched pair) output line type from Point-Stat and creates scatter
plots.
It could easily be adapted to process SL1L2 output lines and plot FBAR
vs
OBAR instead of MPR lines.  On this page (
http://www.dtcenter.org/met/users/downloads/analysis_scripts.php) take
a
look at the "plot_mpr.R" script, and here's some sample output it
creates:
   http://www.dtcenter.org/met/users/downloads/Rscripts/mpr_plots.pdf

You pass it a list of files containing MPR output lines from MET.
It'll
read them all in and identify cases (unique combinations of model,
variable, level, obtype, masking region, and interpolation method).
For
each case, it creates 4 plots summarizing the fcst/obs pairs:
histogram of
forecast values, histogram of observation values, scatter plot, and a
q-q
(quantile-quantile) plot.

If you decide to use/adapt that Rscript, just let us know if you have
any
questions.

Thanks,
John


On Thu, May 19, 2016 at 10:42 AM, Jacob Carley - NOAA Affiliate via RT
<
met_help at ucar.edu> wrote:

>
> Thu May 19 10:42:49 2016: Request 76423 was acted upon.
> Transaction: Ticket created by jacob.carley at noaa.gov
>        Queue: met_help
>      Subject: MET Viewer: Creating Scatter Plots
>        Owner: Nobody
>   Requestors: jacob.carley at noaa.gov
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=76423 >
>
>
> HI MET Help,
>
> I would like to try making a scatter plot with MET Viewer to compare
> forecast and observed fields.  A simple example:
>
> http://www.cawcr.gov.au/projects/verification/scatterplot.gif
>
> However I do not see a clear way to do this with MET Viewer.  Is
there a
> way that this can be done?
>
> Thanks!
> Jacob
>
>

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Subject: MET Viewer: Creating Scatter Plots
From: Jacob Carley - NOAA Affiliate
Time: Fri May 20 11:34:26 2016

Hi John,

Thanks for letting me know and I am glad to hear the capability is in
development.

I will take a look at that R script should the need for scatter plots
arise
again.  Thankfully I/we were able to get what we needed from some box
and
whisker plots.

Thanks again,
Jacob

On Fri, May 20, 2016 at 12:02 PM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:

> Hi Jacob,
>
> Unfortunately, METViewer cannot currently make scatter plots.
However, it
> is on our radar, and we already have a development task defined for
this.
> But I don't have a good idea of when it'll bubble to top of the
priority
> list.
>
> In the meantime, I can point you to a sample Rscript which reads the
MPR
> (matched pair) output line type from Point-Stat and creates scatter
plots.
> It could easily be adapted to process SL1L2 output lines and plot
FBAR vs
> OBAR instead of MPR lines.  On this page (
> http://www.dtcenter.org/met/users/downloads/analysis_scripts.php)
take a
> look at the "plot_mpr.R" script, and here's some sample output it
creates:
>
http://www.dtcenter.org/met/users/downloads/Rscripts/mpr_plots.pdf
>
> You pass it a list of files containing MPR output lines from MET.
It'll
> read them all in and identify cases (unique combinations of model,
> variable, level, obtype, masking region, and interpolation method).
For
> each case, it creates 4 plots summarizing the fcst/obs pairs:
histogram of
> forecast values, histogram of observation values, scatter plot, and
a q-q
> (quantile-quantile) plot.
>
> If you decide to use/adapt that Rscript, just let us know if you
have any
> questions.
>
> Thanks,
> John
>
>
> On Thu, May 19, 2016 at 10:42 AM, Jacob Carley - NOAA Affiliate via
RT <
> met_help at ucar.edu> wrote:
>
> >
> > Thu May 19 10:42:49 2016: Request 76423 was acted upon.
> > Transaction: Ticket created by jacob.carley at noaa.gov
> >        Queue: met_help
> >      Subject: MET Viewer: Creating Scatter Plots
> >        Owner: Nobody
> >   Requestors: jacob.carley at noaa.gov
> >       Status: new
> >  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=76423 >
> >
> >
> > HI MET Help,
> >
> > I would like to try making a scatter plot with MET Viewer to
compare
> > forecast and observed fields.  A simple example:
> >
> > http://www.cawcr.gov.au/projects/verification/scatterplot.gif
> >
> > However I do not see a clear way to do this with MET Viewer.  Is
there a
> > way that this can be done?
> >
> > Thanks!
> > Jacob
> >
> >
>
>

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