[Met_help] [rt.rap.ucar.edu #75547] History for Grid-Stat question (UNCLASSIFIED)
John Halley Gotway via RT
met_help at ucar.edu
Wed Mar 16 11:11:20 MDT 2016
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
CLASSIFICATION: UNCLASSIFIED
Is there supposed to be a correspondence between the config file setting "width" in the "interp" group and the "width" setting used in the "nbrhd" group? For example, if I specify five values of width for the nbrhd group, do I have to specify the same number of values for the width in the interp group?
Thanks.
R/
John
Mr John W. Raby, Meteorologist
U.S. Army Research Laboratory
White Sands Missile Range, NM 88002
(575) 678-2004 DSN 258-2004
FAX (575) 678-1230 DSN 258-1230
Email: john.w.raby2.civ at mail.mil
CLASSIFICATION: UNCLASSIFIED
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Grid-Stat question (UNCLASSIFIED)
From: John Halley Gotway
Time: Wed Mar 16 09:16:04 2016
John,
The "interp" and "nbhrd" sections in the Grid-Stat configuration file
serve
two different purposes.
The interp section (or dictionary, as we call it) specifies how to
smooth
the gridded data Grid-Stat reads prior to computing continuous and
categorical statistics (i.e. CNT, SL1L2, CTC, and CTS lines types).
For
example, look at the following...
interp = {
field = FCST;
vld_thresh = 1.0;
type = [
{ method = NEAREST; width = 1; },
{ method = UW_MEAN; width = 3; },
{ method = UW_MEAN; width = 5; },
{ method = UW_MEAN; width = 7; },
];
}
This would tell Grid-Stat to smooth only the forecast field (leaving
the
observation field as-is). You'd see continuous statistic output lines
for
each smoothing method you chose. You might looks to see how the RMSE
value
changes the more you smooth the forecast. The claim is often made
that
"smoother" forecasts score better than forecasts with more detail.
This
functionality is meant to check how smoothing a higher resolution
forecast
affects traditional statistics.
The nbrhd section is used in the computation of neighborhood
statistics
(i.e. NBRCNT, NBRCTC, and NBRCTS). It is completely independent of
the
interp section. Grid-Stat takes the raw input gridded data, applies
each
of the categorical thresholds defined in "cat_thresh" and then uses
the
nbhrd.width settings to compute fractional coverage fields. All of
the
neighborhood statistics are defined form these fractional coverage
fields.
Make sense?
Thanks,
John Halley Gotway
On Tue, Mar 15, 2016 at 4:50 PM, Raby, John W USA CIV via RT <
met_help at ucar.edu> wrote:
>
> Tue Mar 15 16:50:52 2016: Request 75547 was acted upon.
> Transaction: Ticket created by john.w.raby2.civ at mail.mil
> Queue: met_help
> Subject: Grid-Stat question (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=75547 >
>
>
> CLASSIFICATION: UNCLASSIFIED
>
> Is there supposed to be a correspondence between the config file
setting
> "width" in the "interp" group and the "width" setting used in the
"nbrhd"
> group? For example, if I specify five values of width for the nbrhd
group,
> do I have to specify the same number of values for the width in the
interp
> group?
>
> Thanks.
>
> R/
> John
>
> Mr John W. Raby, Meteorologist
> U.S. Army Research Laboratory
> White Sands Missile Range, NM 88002
> (575) 678-2004 DSN 258-2004
> FAX (575) 678-1230 DSN 258-1230
> Email: john.w.raby2.civ at mail.mil
>
>
>
> CLASSIFICATION: UNCLASSIFIED
>
>
------------------------------------------------
Subject: RE: [Non-DoD Source] Re: [rt.rap.ucar.edu #75547] Grid-Stat question (UNCLASSIFIED)
From: Raby, John W USA CIV
Time: Wed Mar 16 09:45:21 2016
CLASSIFICATION: UNCLASSIFIED
John -
Thanks for your explanation to confirm the independence of those two
sections.
Regards your last sentence, I was confused on that because of the
sentence on p. 5-9 of the V4.1 User's Guide:
"The interp group contains a list of operations to be performed on the
forecast or
observation field prior to performing verification."
This lead me to believe that the smoothing was done before the
calculation of the neighborhood statistics and since the smoothing
involved user input on the width, I was starting to get the idea that
you had to ensure some sort of correspondence between the widths for
smoothing and that used for the neighborhoods.
Your statement that the neighborhood stats are calculated form the raw
input gridded data and not from the smoothed gridded data clears this
up.
R/
John
-----Original Message-----
From: John Halley Gotway via RT [mailto:met_help at ucar.edu]
Sent: Wednesday, March 16, 2016 9:16 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 #75547] Grid-Stat
question (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,
The "interp" and "nbhrd" sections in the Grid-Stat configuration file
serve two different purposes.
The interp section (or dictionary, as we call it) specifies how to
smooth the gridded data Grid-Stat reads prior to computing continuous
and categorical statistics (i.e. CNT, SL1L2, CTC, and CTS lines
types). For example, look at the following...
interp = {
field = FCST;
vld_thresh = 1.0;
type = [
{ method = NEAREST; width = 1; },
{ method = UW_MEAN; width = 3; },
{ method = UW_MEAN; width = 5; },
{ method = UW_MEAN; width = 7; },
];
}
This would tell Grid-Stat to smooth only the forecast field (leaving
the observation field as-is). You'd see continuous statistic output
lines for each smoothing method you chose. You might looks to see how
the RMSE value changes the more you smooth the forecast. The claim is
often made that "smoother" forecasts score better than forecasts with
more detail. This functionality is meant to check how smoothing a
higher resolution forecast affects traditional statistics.
The nbrhd section is used in the computation of neighborhood
statistics (i.e. NBRCNT, NBRCTC, and NBRCTS). It is completely
independent of the interp section. Grid-Stat takes the raw input
gridded data, applies each of the categorical thresholds defined in
"cat_thresh" and then uses the nbhrd.width settings to compute
fractional coverage fields. All of the neighborhood statistics are
defined form these fractional coverage fields.
Make sense?
Thanks,
John Halley Gotway
On Tue, Mar 15, 2016 at 4:50 PM, Raby, John W USA CIV via RT <
met_help at ucar.edu> wrote:
>
> Tue Mar 15 16:50:52 2016: Request 75547 was acted upon.
> Transaction: Ticket created by john.w.raby2.civ at mail.mil
> Queue: met_help
> Subject: Grid-Stat question (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=75547 >
>
>
> CLASSIFICATION: UNCLASSIFIED
>
> Is there supposed to be a correspondence between the config file
> setting "width" in the "interp" group and the "width" setting used
in the "nbrhd"
> group? For example, if I specify five values of width for the nbrhd
> group, do I have to specify the same number of values for the width
in
> the interp group?
>
> Thanks.
>
> R/
> John
>
> Mr John W. Raby, Meteorologist
> U.S. Army Research Laboratory
> White Sands Missile Range, NM 88002
> (575) 678-2004 DSN 258-2004
> FAX (575) 678-1230 DSN 258-1230
> Email: john.w.raby2.civ at mail.mil
>
>
>
> CLASSIFICATION: UNCLASSIFIED
>
>
CLASSIFICATION: UNCLASSIFIED
------------------------------------------------
Subject: Grid-Stat question (UNCLASSIFIED)
From: John Halley Gotway
Time: Wed Mar 16 11:11:12 2016
John,
Thanks for the feedback. I checked and the 5.1 version of the user's
guide
no longer contains that sentence. I'll go ahead and resolve this
ticket.
Thanks,
John
On Wed, Mar 16, 2016 at 9:45 AM, Raby, John W USA CIV via RT <
met_help at ucar.edu> wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=75547 >
>
> CLASSIFICATION: UNCLASSIFIED
>
> John -
>
> Thanks for your explanation to confirm the independence of those two
> sections.
>
> Regards your last sentence, I was confused on that because of the
sentence
> on p. 5-9 of the V4.1 User's Guide:
>
> "The interp group contains a list of operations to be performed on
the
> forecast or
> observation field prior to performing verification."
>
> This lead me to believe that the smoothing was done before the
calculation
> of the neighborhood statistics and since the smoothing involved user
input
> on the width, I was starting to get the idea that you had to ensure
some
> sort of correspondence between the widths for smoothing and that
used for
> the neighborhoods.
>
> Your statement that the neighborhood stats are calculated form the
raw
> input gridded data and not from the smoothed gridded data clears
this up.
>
> R/
> John
>
>
> -----Original Message-----
> From: John Halley Gotway via RT [mailto:met_help at ucar.edu]
> Sent: Wednesday, March 16, 2016 9:16 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 #75547] Grid-Stat
question
> (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,
>
> The "interp" and "nbhrd" sections in the Grid-Stat configuration
file
> serve two different purposes.
>
> The interp section (or dictionary, as we call it) specifies how to
smooth
> the gridded data Grid-Stat reads prior to computing continuous and
> categorical statistics (i.e. CNT, SL1L2, CTC, and CTS lines types).
For
> example, look at the following...
>
> interp = {
> field = FCST;
> vld_thresh = 1.0;
>
> type = [
> { method = NEAREST; width = 1; },
> { method = UW_MEAN; width = 3; },
> { method = UW_MEAN; width = 5; },
> { method = UW_MEAN; width = 7; },
> ];
> }
>
> This would tell Grid-Stat to smooth only the forecast field (leaving
the
> observation field as-is). You'd see continuous statistic output
lines for
> each smoothing method you chose. You might looks to see how the
RMSE value
> changes the more you smooth the forecast. The claim is often made
that
> "smoother" forecasts score better than forecasts with more detail.
This
> functionality is meant to check how smoothing a higher resolution
forecast
> affects traditional statistics.
>
> The nbrhd section is used in the computation of neighborhood
statistics
> (i.e. NBRCNT, NBRCTC, and NBRCTS). It is completely independent of
the
> interp section. Grid-Stat takes the raw input gridded data, applies
each
> of the categorical thresholds defined in "cat_thresh" and then uses
the
> nbhrd.width settings to compute fractional coverage fields. All of
the
> neighborhood statistics are defined form these fractional coverage
fields.
>
> Make sense?
>
> Thanks,
> John Halley Gotway
>
>
> On Tue, Mar 15, 2016 at 4:50 PM, Raby, John W USA CIV via RT <
> met_help at ucar.edu> wrote:
>
> >
> > Tue Mar 15 16:50:52 2016: Request 75547 was acted upon.
> > Transaction: Ticket created by john.w.raby2.civ at mail.mil
> > Queue: met_help
> > Subject: Grid-Stat question (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=75547 >
> >
> >
> > CLASSIFICATION: UNCLASSIFIED
> >
> > Is there supposed to be a correspondence between the config file
> > setting "width" in the "interp" group and the "width" setting used
in
> the "nbrhd"
> > group? For example, if I specify five values of width for the
nbrhd
> > group, do I have to specify the same number of values for the
width in
> > the interp group?
> >
> > Thanks.
> >
> > R/
> > John
> >
> > Mr John W. Raby, Meteorologist
> > U.S. Army Research Laboratory
> > White Sands Missile Range, NM 88002
> > (575) 678-2004 DSN 258-2004
> > FAX (575) 678-1230 DSN 258-1230
> > Email: john.w.raby2.civ at mail.mil
> >
> >
> >
> > CLASSIFICATION: UNCLASSIFIED
> >
> >
>
>
> CLASSIFICATION: UNCLASSIFIED
>
>
>
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