[Met_help] MET Mode Question

John Halley Gotway johnhg at rap.ucar.edu
Fri Nov 6 15:37:59 MST 2009


Sorry for the confusion.  You're right that the MODE-Analysis tool options
take some getting used to.

I think the confusion is arising from the fact that some of the attributes
in which your interested are defined for pairs of objects while other are
defined only for single objects.  You'll need to break those up into
separate jobs.

The following apply to single objects:

And the following apply to pairs of objects:

It sounds to me that you'd like to answer the following questions:

(1) What do the distributions of AREA's and CENTROID_X,Y's for
matched/unmatched simple forecast/observation objects look like?

Run 4 jobs for each lead time, using these options:

For matched fcst objects:
-summary \
-column AREA -column CENTROID_X -column CENTROID_Y \
-simple -single -matched -fcst

For unmatched fcst objects:
-summary \
-column AREA -column CENTROID_X -column CENTROID_Y \
-simple -single -unmatched -fcst

For matched obs objects:
-summary \
-column AREA -column CENTROID_X -column CENTROID_Y \
-simple -single -matched -obs

For unmatched obs objects:
-summary \
-column AREA -column CENTROID_X -column CENTROID_Y \
-simple -single -unmatched -obs

(2) How similar are the matched clusters of objects?

Run 1 job for each lead time, using these options:

For pairs of matched object clusters:
-summary \
-pair -cluster

Hopefully that helps.  Just let us know if you need any more assistance.

Also, I noticed that you don't appear to be registered as a MET user in
our database.  When you get a chance, please fill out the registration
form here:
Just enter you email address in the box and hit enter.  That'll take you
to the registration page.

John Halley Gotway
johnhg at ucar.edu

> We have been running MODE for our cloud forecasts over a period of
> several weeks.  Originally, we wanted to be able to summarize the
> position errors of the cloud features.  But our domain was too small to
> be able to completely resolve cloud features so we are now running mode
> on our larger domain forecast.  However to make use of the data we have
> already collected for a briefing, I was going to try to get a handle on
> cloud area differences between the forecast and the observation.  Also,
> I would like to get the number of times the forecast missed the observed
> cloud or cloud was forecast but didn't occur.
> Looking through the documentation, it just is not very clear on what
> options I should set in mode analysis to get the data listed above.  My
> current command line is:
> /sphome/qcteam/METv2.0/bin/mode_analysis -lookin
> /sphome/qcteam/METv2.0/out/mode/t06 -dump_row /sphome/qcteam/mode_dump
> -summary -column AREA_RATIO -column INTERSECTION_AREA -column UNION_AREA
> -column AREA -column INTEREST -pair  -cluster -out
> /sphome/qcteam/dcf_obs_pair_cluster -fcst_lead 24
> I would like to summarize the data by forecast hour, so I would run it
> with differenc -fcst_lead values.  When I run this the area is 0.  If I
> run using -bycase, I get counts for fcst matched and obs matched but not
> fcst unmatched and ob unmatched.  I don't use the -matched/-unmatched
> since the documentation implied you would get both if you didn't include
> them.
> What options should I be running with?
> Thanks
> Bob Craig
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