[Met_help] [rt.rap.ucar.edu #81837] History for question about Ensemble-Stat (UNCLASSIFIED)

[John Halley Gotway via RT]

----------------------------------------------------------------
  Initial Request
----------------------------------------------------------------

CLASSIFICATION: UNCLASSIFIED

I'm running MET V4.1 and I specified "rank = TRUE"  as one of the 10
possible ensemble_flags in the config file.  The User's Guide says I should
expect a NetCDF file called:
"Gridded Field of Observation Ranks". My output only contains one NetCDF
file which appears to be the " Gridded fields of Ensemble forecast values"
(maximum, mean, mean plus1, mean minus1, etc). I checked the release notes
but didn't find any mention of this as a bug  fix. Why am I missing the
Gridded field of Observation Ranks NetCDF file?

Thanks.

R/
John


CLASSIFICATION: UNCLASSIFIED


----------------------------------------------------------------
  Complete Ticket History
----------------------------------------------------------------

Subject: question about Ensemble-Stat (UNCLASSIFIED)
From: John Halley Gotway
Time: Fri Sep 01 09:18:45 2017

John,

I see that you're running Ensemble-Stat and have a question about the
NetCDF matched pairs output file.  You're expecting to see a gridded
field
of ranks in that file but do not.

This all depends on what inputs you pass to Ensemble-Stat when you run
it.
Unless you've used the "-grid_obs" command line option to pass in
gridded
observation fields, Ensemble-Stat won't have the data necessary to
compute
that output field.

The "ranks" that we're talking about are the rank of the observations.
Let's say you're processing an ensemble of size 10.  For each
observation
point, we have 10 corresponding forecast values, one from each
ensemble
member.  When you sort those 10 ensemble members values from smallest
to
largest, the observation value could either be less than them all
(i.e.
rank = 1), greater than them all (i.e. rank = 11), or somewhere in the
middle (i.e. ranks 2 through 10).  When processing point observations
specified by the "-point_obs" command line option, this rank
information is
written out to the ASCII output files in the ORANK line type.  When
processing gridded observations specified by the "-grid_obs" command
line
option, this rank information is written to the gridded NetCDF output
file
because writing it to ASCII isn't feasible.

I suspect you rank Ensemble-Stat *without* using the -grid_obs command
line
option.

Hope that helps clarify.

Thanks,
John

On Thu, Aug 31, 2017 at 2:57 PM, Raby, John W USA CIV via RT <
met_help at ucar.edu> wrote:

>
> Thu Aug 31 14:57:50 2017: Request 81837 was acted upon.
> Transaction: Ticket created by john.w.raby2.civ at mail.mil
>        Queue: met_help
>      Subject: question about Ensemble-Stat (UNCLASSIFIED)
>        Owner: Nobody
>   Requestors: john.w.raby2.civ at mail.mil
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81837 >
>
>
> CLASSIFICATION: UNCLASSIFIED
>
> I'm running MET V4.1 and I specified "rank = TRUE"  as one of the 10
> possible ensemble_flags in the config file.  The User's Guide says I
should
> expect a NetCDF file called:
> "Gridded Field of Observation Ranks". My output only contains one
NetCDF
> file which appears to be the " Gridded fields of Ensemble forecast
values"
> (maximum, mean, mean plus1, mean minus1, etc). I checked the release
notes
> but didn't find any mention of this as a bug  fix. Why am I missing
the
> Gridded field of Observation Ranks NetCDF file?
>
> Thanks.
>
> R/
> John
>
>
> CLASSIFICATION: UNCLASSIFIED
>
>

------------------------------------------------
Subject: question about Ensemble-Stat (UNCLASSIFIED)
From: Raby, John W USA CIV
Time: Fri Sep 01 09:48:33 2017

CLASSIFICATION: UNCLASSIFIED

John -

Thanks for your response and explanation about the rank of the
observations.
You are correct about not using gridded obs. I am using point
observations.
That explains why I wasn't seeing the other NetCDF file. I anticipate
using
gridded obs of accumulated precip (Stage IV) for another project which
will
require Ensemble-Stat (V5.2), so I'll be interested in looking at this
NetCDF
file.

R/
John

-----Original Message-----
From: John Halley Gotway via RT [mailto:met_help at ucar.edu]
Sent: Friday, September 01, 2017 9:19 AM
To: Raby, John W CIV USARMY RDECOM ARL (US)
<john.w.raby2.civ at mail.mil>
Subject: [Non-DoD Source] Re: [rt.rap.ucar.edu #81837] question about
Ensemble-Stat (UNCLASSIFIED)

All active links contained in this email were disabled.  Please verify
the
identity of the sender, and confirm the authenticity of all links
contained
within the message prior to copying and pasting the address to a Web
browser.




----

John,

I see that you're running Ensemble-Stat and have a question about the
NetCDF
matched pairs output file.  You're expecting to see a gridded field of
ranks
in that file but do not.

This all depends on what inputs you pass to Ensemble-Stat when you run
it.
Unless you've used the "-grid_obs" command line option to pass in
gridded
observation fields, Ensemble-Stat won't have the data necessary to
compute
that output field.

The "ranks" that we're talking about are the rank of the observations.
Let's say you're processing an ensemble of size 10.  For each
observation
point, we have 10 corresponding forecast values, one from each
ensemble
member.  When you sort those 10 ensemble members values from smallest
to
largest, the observation value could either be less than them all
(i.e.
rank = 1), greater than them all (i.e. rank = 11), or somewhere in the
middle
(i.e. ranks 2 through 10).  When processing point observations
specified by
the "-point_obs" command line option, this rank information is written
out to
the ASCII output files in the ORANK line type.  When processing
gridded
observations specified by the "-grid_obs" command line option, this
rank
information is written to the gridded NetCDF output file because
writing it to
ASCII isn't feasible.

I suspect you rank Ensemble-Stat *without* using the -grid_obs command
line
option.

Hope that helps clarify.

Thanks,
John

On Thu, Aug 31, 2017 at 2:57 PM, Raby, John W USA CIV via RT <
met_help at ucar.edu> wrote:

>
> Thu Aug 31 14:57:50 2017: Request 81837 was acted upon.
> Transaction: Ticket created by john.w.raby2.civ at mail.mil
>        Queue: met_help
>      Subject: question about Ensemble-Stat (UNCLASSIFIED)
>        Owner: Nobody
>   Requestors: john.w.raby2.civ at mail.mil
>       Status: new
>  Ticket <Caution-url:
> Caution-https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81837 >
>
>
> CLASSIFICATION: UNCLASSIFIED
>
> I'm running MET V4.1 and I specified "rank = TRUE"  as one of the 10
> possible ensemble_flags in the config file.  The User's Guide says I
> should expect a NetCDF file called:
> "Gridded Field of Observation Ranks". My output only contains one
> NetCDF file which appears to be the " Gridded fields of Ensemble
forecast
> values"
> (maximum, mean, mean plus1, mean minus1, etc). I checked the release
> notes but didn't find any mention of this as a bug  fix. Why am I
> missing the Gridded field of Observation Ranks NetCDF file?
>
> Thanks.
>
> R/
> John
>
>
> CLASSIFICATION: UNCLASSIFIED
>
>


CLASSIFICATION: UNCLASSIFIED

------------------------------------------------