[Met_help] [rt.rap.ucar.edu #39448] History for Re: A no-rush question
RAL HelpDesk {for John Halley Gotway}
met_help at ucar.edu
Mon Jul 26 14:50:17 MDT 2010
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Jackie,
It sounds like you're interested in applying multiple thresholds to the
wind speed field. So rather than using a single threshold to define a 2x2
contingency table, you'd like to use n thresholds to define an n+1 by n+1
contingency table.
For the tutorial in a couple of weeks, you'll be running a beta release of
METv3.0, and in METv3.0 we've added support for multi-category contingency
tables in Grid-Stat and Point-Stat. However, the statistics you derive
from them is rather limited. And unfortunately, I can't remember them off
the top of my head. But we'll go over them at the tutorial. And you can
ask Tressa Fowler for some statistics advice about your specific
situation.
You may also be able to set up METv2.0 to do what you'd like...
(1)If you're running Grid-Stat or Point-Stat and verifying over the full
domain of the data... you could define a data masking region where you
only use forecast points where the forecast wind speed is < 12m/s. For
example, in the config file set:
mask_poly[] = [ “infile.grb WIND/Z10 lt12.0" ];
That way, only those points which have wind speeds less than 12m/s will
be used in the verification. Next, in the config file simply verify by
setting the forecast threshold to gt4.0. This will only work over the
full domain since masking regions can't be “combined”. They're applied
one at a time.
(2)If you're running Point-Stat, you could dump out the matched pairs
(MPR) line type. Then you could run those MPR lines through the
Stat-Analysis tool and run a job like this:
stat_analysis \
-lookin out/point_stat \
-job aggregate_stat \
-line_type MPR \
-out_line_type CNT \
-fcst_var WIND \
-column_min FCST 4.0 \
-column_max FCST 12.0
That'll filter the MPR lines, only retain those with a forecast value
between 4 and 12 and compute a bunch of continuous statistics from them.
Hope that gives you some ideas.
John
> Hi John,
>
>
>
> No rush to answer this on your break, but wanted to get it in your
> inbox. I want to include some discrete statistics in my verification.
> More specifically, I am interested in determining when the windspeed is
>> 4m/s AND <12 m/s. I see that I can specify multiple thresholds for a
> single variable, but in the output it treats each threshold separately
> (separate line for >4 m/s and <12m/s). If necessary, I can glean the
> information I need from these separate lines, but wanted to see if there
> was a way to combine these thresholds.
>
>
>
> Thanks,
>
> Jackie
>
>
>
> Jackie Miller
> Meteorologist
>
> Vaisala Inc.
>
> Phone +1 303 885 3251
> Mobile +1 303 885 3251
> www.vaisala.com
> <https://exchange.ou.edu/owa/redir.aspx?C=b302bd7f7cb24f099b2eb70ba1b9bf
> 5f&URL=https%3a%2f%2fwebmail.vaisala.com%2fexchweb%2fbin%2fredir.asp%3fU
> RL%3dhttp%3a%2f%2fwww.vaisala.com>
>
>
>
> This electronic message contains a communication which is strictly
> confidential and intended solely for the addressee(s). Any
> non-addressee is prohibited from reading, disseminating, distributing,
> or copying the communication contained herein. If you are in possession
> of the communication in error, please immediately notify the sender via
> an electronic response and destroy the original communication. Thank
> you.
>
>
>
> U.S. Export Restrictions & Disclaimer: Export of any technical
> information contained in this email and/or its attachments is subject to
> the export control laws and regulations of the U.S. Government and may
> require a valid license or written approval prior to export.
>
>
>
>
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Re: A no-rush question
From: John Halley Gotway
Time: Mon Jul 26 13:21:47 2010
Jackie,
Just got back in the office today and am catching up on email. Did
the response below answer your question? If so, I'll close the
ticket.
Thanks,
John
On Mon Jul 19 21:06:37 2010, johnhg wrote:
> Jackie,
>
> It sounds like you're interested in applying multiple thresholds to
the
> wind speed field. So rather than using a single threshold to define
a 2x2
> contingency table, you'd like to use n thresholds to define an n+1
by n+1
> contingency table.
>
> For the tutorial in a couple of weeks, you'll be running a beta
release of
> METv3.0, and in METv3.0 we've added support for multi-category
contingency
> tables in Grid-Stat and Point-Stat. However, the statistics you
derive
> from them is rather limited. And unfortunately, I can't remember
them off
> the top of my head. But we'll go over them at the tutorial. And
you can
> ask Tressa Fowler for some statistics advice about your specific
> situation.
>
> You may also be able to set up METv2.0 to do what you'd like...
>
> (1)If you're running Grid-Stat or Point-Stat and verifying over the
full
> domain of the data... you could define a data masking region where
you
> only use forecast points where the forecast wind speed is < 12m/s.
For
> example, in the config file set:
>
> mask_poly[] = [ “infile.grb WIND/Z10 lt12.0" ];
>
> That way, only those points which have wind speeds less than 12m/s
will
> be used in the verification. Next, in the config file simply verify
by
> setting the forecast threshold to gt4.0. This will only work over
the
> full domain since masking regions can't be “combined”. They're
applied
> one at a time.
>
> (2)If you're running Point-Stat, you could dump out the matched
pairs
> (MPR) line type. Then you could run those MPR lines through the
> Stat-Analysis tool and run a job like this:
>
> stat_analysis \
> -lookin out/point_stat \
> -job aggregate_stat \
> -line_type MPR \
> -out_line_type CNT \
> -fcst_var WIND \
> -column_min FCST 4.0 \
> -column_max FCST 12.0
>
> That'll filter the MPR lines, only retain those with a forecast
value
> between 4 and 12 and compute a bunch of continuous statistics from
them.
>
> Hope that gives you some ideas.
>
> John
>
> > Hi John,
> >
> >
> >
> > No rush to answer this on your break, but wanted to get it in your
> > inbox. I want to include some discrete statistics in my
verification.
> > More specifically, I am interested in determining when the
windspeed is
> >> 4m/s AND <12 m/s. I see that I can specify multiple thresholds
for a
> > single variable, but in the output it treats each threshold
separately
> > (separate line for >4 m/s and <12m/s). If necessary, I can glean
the
> > information I need from these separate lines, but wanted to see if
there
> > was a way to combine these thresholds.
> >
> >
> >
> > Thanks,
> >
> > Jackie
> >
> >
> >
> > Jackie Miller
> > Meteorologist
> >
> > Vaisala Inc.
> >
> > Phone +1 303 885 3251
> > Mobile +1 303 885 3251
> > www.vaisala.com
> >
<https://exchange.ou.edu/owa/redir.aspx?C=b302bd7f7cb24f099b2eb70ba1b9bf
> >
5f&URL=https%3a%2f%2fwebmail.vaisala.com%2fexchweb%2fbin%2fredir.asp%3fU
> > RL%3dhttp%3a%2f%2fwww.vaisala.com>
> >
> >
> >
> > This electronic message contains a communication which is strictly
> > confidential and intended solely for the addressee(s). Any
> > non-addressee is prohibited from reading, disseminating,
distributing,
> > or copying the communication contained herein. If you are in
possession
> > of the communication in error, please immediately notify the
sender via
> > an electronic response and destroy the original communication.
Thank
> > you.
> >
> >
> >
> > U.S. Export Restrictions & Disclaimer: Export of any technical
> > information contained in this email and/or its attachments is
subject to
> > the export control laws and regulations of the U.S. Government and
may
> > require a valid license or written approval prior to export.
> >
> >
> >
> >
>
>
------------------------------------------------
Subject: RE: [rt.rap.ucar.edu #39448] Re: A no-rush question
From: jackie.miller
Time: Mon Jul 26 13:55:32 2010
Yes - you answered my questions. Thank you!
Jackie Miller
Meteorologist
Vaisala Inc.
Phone +1 303 885 3251
Mobile +1 303 885 3251
www.vaisala.com
This electronic message contains a communication which is strictly
confidential and intended solely for the addressee(s). Any non-
addressee is prohibited from reading, disseminating, distributing, or
copying the communication contained herein. If you are in possession
of the communication in error, please immediately notify the sender
via an electronic response and destroy the original communication.
Thank you.
U.S. Export Restrictions & Disclaimer: Export of any technical
information contained in this email and/or its attachments is subject
to the export control laws and regulations of the U.S. Government and
may require a valid license or written approval prior to export.
-----Original Message-----
From: RAL HelpDesk {for John Halley Gotway} [mailto:met_help at ucar.edu]
Sent: Monday, July 26, 2010 2:22 PM
To: johnhg at ucar.edu
Cc: Miller Jackie JCM
Subject: [rt.rap.ucar.edu #39448] Re: A no-rush question
Jackie,
Just got back in the office today and am catching up on email. Did
the response below answer your question? If so, I'll close the
ticket.
Thanks,
John
On Mon Jul 19 21:06:37 2010, johnhg wrote:
> Jackie,
>
> It sounds like you're interested in applying multiple thresholds to
the
> wind speed field. So rather than using a single threshold to define
a 2x2
> contingency table, you'd like to use n thresholds to define an n+1
by n+1
> contingency table.
>
> For the tutorial in a couple of weeks, you'll be running a beta
release of
> METv3.0, and in METv3.0 we've added support for multi-category
contingency
> tables in Grid-Stat and Point-Stat. However, the statistics you
derive
> from them is rather limited. And unfortunately, I can't remember
them off
> the top of my head. But we'll go over them at the tutorial. And
you can
> ask Tressa Fowler for some statistics advice about your specific
> situation.
>
> You may also be able to set up METv2.0 to do what you'd like...
>
> (1)If you're running Grid-Stat or Point-Stat and verifying over the
full
> domain of the data... you could define a data masking region where
you
> only use forecast points where the forecast wind speed is < 12m/s.
For
> example, in the config file set:
>
> mask_poly[] = [ “infile.grb WIND/Z10 lt12.0" ];
>
> That way, only those points which have wind speeds less than 12m/s
will
> be used in the verification. Next, in the config file simply verify
by
> setting the forecast threshold to gt4.0. This will only work over
the
> full domain since masking regions can't be “combined”. They're
applied
> one at a time.
>
> (2)If you're running Point-Stat, you could dump out the matched
pairs
> (MPR) line type. Then you could run those MPR lines through the
> Stat-Analysis tool and run a job like this:
>
> stat_analysis \
> -lookin out/point_stat \
> -job aggregate_stat \
> -line_type MPR \
> -out_line_type CNT \
> -fcst_var WIND \
> -column_min FCST 4.0 \
> -column_max FCST 12.0
>
> That'll filter the MPR lines, only retain those with a forecast
value
> between 4 and 12 and compute a bunch of continuous statistics from
them.
>
> Hope that gives you some ideas.
>
> John
>
> > Hi John,
> >
> >
> >
> > No rush to answer this on your break, but wanted to get it in your
> > inbox. I want to include some discrete statistics in my
verification.
> > More specifically, I am interested in determining when the
windspeed is
> >> 4m/s AND <12 m/s. I see that I can specify multiple thresholds
for a
> > single variable, but in the output it treats each threshold
separately
> > (separate line for >4 m/s and <12m/s). If necessary, I can glean
the
> > information I need from these separate lines, but wanted to see if
there
> > was a way to combine these thresholds.
> >
> >
> >
> > Thanks,
> >
> > Jackie
> >
> >
> >
> > Jackie Miller
> > Meteorologist
> >
> > Vaisala Inc.
> >
> > Phone +1 303 885 3251
> > Mobile +1 303 885 3251
> > www.vaisala.com
> >
<https://exchange.ou.edu/owa/redir.aspx?C=b302bd7f7cb24f099b2eb70ba1b9bf
> >
5f&URL=https%3a%2f%2fwebmail.vaisala.com%2fexchweb%2fbin%2fredir.asp%3fU
> > RL%3dhttp%3a%2f%2fwww.vaisala.com>
> >
> >
> >
> > This electronic message contains a communication which is strictly
> > confidential and intended solely for the addressee(s). Any
> > non-addressee is prohibited from reading, disseminating,
distributing,
> > or copying the communication contained herein. If you are in
possession
> > of the communication in error, please immediately notify the
sender via
> > an electronic response and destroy the original communication.
Thank
> > you.
> >
> >
> >
> > U.S. Export Restrictions & Disclaimer: Export of any technical
> > information contained in this email and/or its attachments is
subject to
> > the export control laws and regulations of the U.S. Government and
may
> > require a valid license or written approval prior to export.
> >
> >
> >
> >
>
>
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