[Met_help] [rt.rap.ucar.edu #84381] History for Question about merge_thresh
John Halley Gotway via RT
met_help at ucar.edu
Tue Jul 9 12:03:51 MDT 2019
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Dear MET help,
I am running MODE to verify 24 hr precipitation between obs and forecast
files. I originally set merge_flag to NONE, but I understand, from a
previous discussion with John, that its better to set to THRESH. But if
done so, to set a reasonable value for merge_thresh. My question is, if I
set a conv_thresh of 10 mm, can I use half of that for merge_thresh, i.e
whatever I have for conv_thresh divided in half? Or do I have to just play
around with it to see how it is defining objects?
Second, is there a conus grid in MET over the southeast U.S.? I want to
look at verification in that area of a certain storm and not over the whole
conus?
Thanks,
--
Andrew Kren
Assistant Scientist
CIMAS & NOAA/AOML
325 Broadway, Boulder, CO 80305
(303) 497-5418
----------------------------------------------------------------
Complete Ticket History
----------------------------------------------------------------
Subject: Question about merge_thresh
From: John Halley Gotway
Time: Mon Mar 12 09:47:23 2018
Hi Andrew,
I see you have some questions about running the MODE tool.
Yes, it really is up to you to decide what sort of merge_thresh you'd
like
to use. I can tell you that when running MODE on precip data, one of
our
scientists set merge_thresh = to 80 or 90% of the conv_thresh. I
can't
remember which. The motivation behind the merge_thresh is when you
use
MODE to define objects for relatively intense events (i.e. high
precip).
Those intense objects may be part of a larger, more wide-spread
system.
The merge_thresh is intended to group those types of intense objects
together.
MET does contain some pre-defined grids that are referenced as "G#"
where #
is the grid number. These are currently limited to pre-defined NCEP
grids:
http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
I don't know if one covers just the southeast CONUS, but my guess
would be
no.
However, you really are limited to those pre-defined grids. Really
you
have two choices here... do you want to (1) use your existing model
grid
and just mask out only the southeast US, or (2) actually regrid your
model/obs data to a grid covering only the southeast US.
You'd do (1) by setting a "grid" or "poly" mask in the "mask" section
of
the MODE config file.
You'd do (2) by setting the "regrid" section of the MODE config file.
I'd suggest picking 4 lat/lon points which describe the region you'd
like
to use and then create an ascii lat/lon polyline and pass it to MODE
as the
"poly" mask.
Hope that helps.
Thanks,
John
On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA Affiliate via RT <
met_help at ucar.edu> wrote:
>
> Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> Transaction: Ticket created by andrew.kren at noaa.gov
> Queue: met_help
> Subject: Question about merge_thresh
> Owner: Nobody
> Requestors: andrew.kren at noaa.gov
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
>
>
> Dear MET help,
>
> I am running MODE to verify 24 hr precipitation between obs and
forecast
> files. I originally set merge_flag to NONE, but I understand, from a
> previous discussion with John, that its better to set to THRESH. But
if
> done so, to set a reasonable value for merge_thresh. My question is,
if I
> set a conv_thresh of 10 mm, can I use half of that for merge_thresh,
i.e
> whatever I have for conv_thresh divided in half? Or do I have to
just play
> around with it to see how it is defining objects?
>
> Second, is there a conus grid in MET over the southeast U.S.? I want
to
> look at verification in that area of a certain storm and not over
the whole
> conus?
>
> Thanks,
>
>
>
> --
> Andrew Kren
> Assistant Scientist
> CIMAS & NOAA/AOML
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
>
------------------------------------------------
Subject: Question about merge_thresh
From: Andrew Kren - NOAA Affiliate
Time: Mon Mar 12 10:27:12 2018
Thanks John,
Regarding the ascii lat/lon polyline, is there an example I can
follow. And
how would I pass it to MODE as the mask?
On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Hi Andrew,
>
> I see you have some questions about running the MODE tool.
>
> Yes, it really is up to you to decide what sort of merge_thresh
you'd like
> to use. I can tell you that when running MODE on precip data, one
of our
> scientists set merge_thresh = to 80 or 90% of the conv_thresh. I
can't
> remember which. The motivation behind the merge_thresh is when you
use
> MODE to define objects for relatively intense events (i.e. high
precip).
> Those intense objects may be part of a larger, more wide-spread
system.
> The merge_thresh is intended to group those types of intense objects
> together.
>
> MET does contain some pre-defined grids that are referenced as "G#"
where #
> is the grid number. These are currently limited to pre-defined NCEP
grids:
> http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
>
> I don't know if one covers just the southeast CONUS, but my guess
would be
> no.
>
> However, you really are limited to those pre-defined grids. Really
you
> have two choices here... do you want to (1) use your existing model
grid
> and just mask out only the southeast US, or (2) actually regrid your
> model/obs data to a grid covering only the southeast US.
>
> You'd do (1) by setting a "grid" or "poly" mask in the "mask"
section of
> the MODE config file.
> You'd do (2) by setting the "regrid" section of the MODE config
file.
>
> I'd suggest picking 4 lat/lon points which describe the region you'd
like
> to use and then create an ascii lat/lon polyline and pass it to MODE
as the
> "poly" mask.
>
> Hope that helps.
>
> Thanks,
> John
>
>
> On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA Affiliate via RT
<
> met_help at ucar.edu> wrote:
>
> >
> > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > Transaction: Ticket created by andrew.kren at noaa.gov
> > Queue: met_help
> > Subject: Question about merge_thresh
> > Owner: Nobody
> > Requestors: andrew.kren at noaa.gov
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> >
> >
> > Dear MET help,
> >
> > I am running MODE to verify 24 hr precipitation between obs and
forecast
> > files. I originally set merge_flag to NONE, but I understand, from
a
> > previous discussion with John, that its better to set to THRESH.
But if
> > done so, to set a reasonable value for merge_thresh. My question
is, if I
> > set a conv_thresh of 10 mm, can I use half of that for
merge_thresh, i.e
> > whatever I have for conv_thresh divided in half? Or do I have to
just
> play
> > around with it to see how it is defining objects?
> >
> > Second, is there a conus grid in MET over the southeast U.S.? I
want to
> > look at verification in that area of a certain storm and not over
the
> whole
> > conus?
> >
> > Thanks,
> >
> >
> >
> > --
> > Andrew Kren
> > Assistant Scientist
> > CIMAS & NOAA/AOML
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> >
>
>
--
Andrew Kren
Assistant Scientist
CIMAS & NOAA/AOML
325 Broadway, Boulder, CO 80305
(303) 497-5418
------------------------------------------------
Subject: Question about merge_thresh
From: John Halley Gotway
Time: Mon Mar 12 11:19:36 2018
Andrew,
Yes, there are several sample lat/lon polyline files included in the
release of MET. You can find them in the installation directory.
Let's
say for example, MET is installed in /usr/local/met-6.1, take a look
in:
ls /usr/local/met-6.1/share/met/poly
For example, the SEC file describes the South East Coast of the US:
head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
Just create an ascii file where...
(1) The first line is the name of the region
(2) All remaining lines contain a latitude and longitude value in
degrees
north and degrees east.
Then run the result through gen_vx_mask to make sure it's what you
want.
For example, let's say you've created TEST.poly
met-6.1/bin/gen_vx_mask model_data_file TEST.poly TEST_mask.nc
-type poly
ncview TEST_mask.nc
Thanks,
John
On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA Affiliate via RT
<
met_help at ucar.edu> wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
>
> Thanks John,
>
> Regarding the ascii lat/lon polyline, is there an example I can
follow. And
> how would I pass it to MODE as the mask?
>
> On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
> met_help at ucar.edu> wrote:
>
> > Hi Andrew,
> >
> > I see you have some questions about running the MODE tool.
> >
> > Yes, it really is up to you to decide what sort of merge_thresh
you'd
> like
> > to use. I can tell you that when running MODE on precip data, one
of our
> > scientists set merge_thresh = to 80 or 90% of the conv_thresh. I
can't
> > remember which. The motivation behind the merge_thresh is when
you use
> > MODE to define objects for relatively intense events (i.e. high
precip).
> > Those intense objects may be part of a larger, more wide-spread
system.
> > The merge_thresh is intended to group those types of intense
objects
> > together.
> >
> > MET does contain some pre-defined grids that are referenced as
"G#"
> where #
> > is the grid number. These are currently limited to pre-defined
NCEP
> grids:
> > http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> >
> > I don't know if one covers just the southeast CONUS, but my guess
would
> be
> > no.
> >
> > However, you really are limited to those pre-defined grids.
Really you
> > have two choices here... do you want to (1) use your existing
model grid
> > and just mask out only the southeast US, or (2) actually regrid
your
> > model/obs data to a grid covering only the southeast US.
> >
> > You'd do (1) by setting a "grid" or "poly" mask in the "mask"
section of
> > the MODE config file.
> > You'd do (2) by setting the "regrid" section of the MODE config
file.
> >
> > I'd suggest picking 4 lat/lon points which describe the region
you'd like
> > to use and then create an ascii lat/lon polyline and pass it to
MODE as
> the
> > "poly" mask.
> >
> > Hope that helps.
> >
> > Thanks,
> > John
> >
> >
> > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA Affiliate via
RT <
> > met_help at ucar.edu> wrote:
> >
> > >
> > > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > Queue: met_help
> > > Subject: Question about merge_thresh
> > > Owner: Nobody
> > > Requestors: andrew.kren at noaa.gov
> > > Status: new
> > > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381
> >
> > >
> > >
> > > Dear MET help,
> > >
> > > I am running MODE to verify 24 hr precipitation between obs and
> forecast
> > > files. I originally set merge_flag to NONE, but I understand,
from a
> > > previous discussion with John, that its better to set to THRESH.
But if
> > > done so, to set a reasonable value for merge_thresh. My question
is,
> if I
> > > set a conv_thresh of 10 mm, can I use half of that for
merge_thresh,
> i.e
> > > whatever I have for conv_thresh divided in half? Or do I have to
just
> > play
> > > around with it to see how it is defining objects?
> > >
> > > Second, is there a conus grid in MET over the southeast U.S.? I
want to
> > > look at verification in that area of a certain storm and not
over the
> > whole
> > > conus?
> > >
> > > Thanks,
> > >
> > >
> > >
> > > --
> > > Andrew Kren
> > > Assistant Scientist
> > > CIMAS & NOAA/AOML
> > > 325 Broadway, Boulder, CO 80305
> > > (303) 497-5418
> > >
> > >
> >
> >
>
>
> --
> Andrew Kren
> Assistant Scientist
> CIMAS & NOAA/AOML
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
>
------------------------------------------------
Subject: Question about merge_thresh
From: Andrew Kren - NOAA Affiliate
Time: Mon Mar 12 11:23:28 2018
Thanks.
So I'd set poly in the config file to my ascii file? Something like:
mask = {
grid = "";
grid_flag = NONE; // Apply to NONE, FCST, OBS, or BOTH
poly = "/path/to/ascii/file/";
poly_flag = BOTH; // Apply to NONE, FCST, OBS, or BOTH
}
On Mon, Mar 12, 2018 at 11:19 AM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Andrew,
>
> Yes, there are several sample lat/lon polyline files included in the
> release of MET. You can find them in the installation directory.
Let's
> say for example, MET is installed in /usr/local/met-6.1, take a look
in:
> ls /usr/local/met-6.1/share/met/poly
>
> For example, the SEC file describes the South East Coast of the US:
> head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
>
> Just create an ascii file where...
> (1) The first line is the name of the region
> (2) All remaining lines contain a latitude and longitude value in
degrees
> north and degrees east.
>
> Then run the result through gen_vx_mask to make sure it's what you
want.
> For example, let's say you've created TEST.poly
>
> met-6.1/bin/gen_vx_mask model_data_file TEST.poly TEST_mask.nc
-type
> poly
>
> ncview TEST_mask.nc
>
> Thanks,
> John
>
>
>
>
>
>
> On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA Affiliate via
RT <
> met_help at ucar.edu> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> >
> > Thanks John,
> >
> > Regarding the ascii lat/lon polyline, is there an example I can
follow.
> And
> > how would I pass it to MODE as the mask?
> >
> > On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
> > met_help at ucar.edu> wrote:
> >
> > > Hi Andrew,
> > >
> > > I see you have some questions about running the MODE tool.
> > >
> > > Yes, it really is up to you to decide what sort of merge_thresh
you'd
> > like
> > > to use. I can tell you that when running MODE on precip data,
one of
> our
> > > scientists set merge_thresh = to 80 or 90% of the conv_thresh.
I can't
> > > remember which. The motivation behind the merge_thresh is when
you use
> > > MODE to define objects for relatively intense events (i.e. high
> precip).
> > > Those intense objects may be part of a larger, more wide-spread
system.
> > > The merge_thresh is intended to group those types of intense
objects
> > > together.
> > >
> > > MET does contain some pre-defined grids that are referenced as
"G#"
> > where #
> > > is the grid number. These are currently limited to pre-defined
NCEP
> > grids:
> > > http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> > >
> > > I don't know if one covers just the southeast CONUS, but my
guess would
> > be
> > > no.
> > >
> > > However, you really are limited to those pre-defined grids.
Really
> you
> > > have two choices here... do you want to (1) use your existing
model
> grid
> > > and just mask out only the southeast US, or (2) actually regrid
your
> > > model/obs data to a grid covering only the southeast US.
> > >
> > > You'd do (1) by setting a "grid" or "poly" mask in the "mask"
section
> of
> > > the MODE config file.
> > > You'd do (2) by setting the "regrid" section of the MODE config
file.
> > >
> > > I'd suggest picking 4 lat/lon points which describe the region
you'd
> like
> > > to use and then create an ascii lat/lon polyline and pass it to
MODE as
> > the
> > > "poly" mask.
> > >
> > > Hope that helps.
> > >
> > > Thanks,
> > > John
> > >
> > >
> > > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA Affiliate
via RT <
> > > met_help at ucar.edu> wrote:
> > >
> > > >
> > > > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > > Queue: met_help
> > > > Subject: Question about merge_thresh
> > > > Owner: Nobody
> > > > Requestors: andrew.kren at noaa.gov
> > > > Status: new
> > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> Ticket/Display.html?id=84381
> > >
> > > >
> > > >
> > > > Dear MET help,
> > > >
> > > > I am running MODE to verify 24 hr precipitation between obs
and
> > forecast
> > > > files. I originally set merge_flag to NONE, but I understand,
from a
> > > > previous discussion with John, that its better to set to
THRESH. But
> if
> > > > done so, to set a reasonable value for merge_thresh. My
question is,
> > if I
> > > > set a conv_thresh of 10 mm, can I use half of that for
merge_thresh,
> > i.e
> > > > whatever I have for conv_thresh divided in half? Or do I have
to just
> > > play
> > > > around with it to see how it is defining objects?
> > > >
> > > > Second, is there a conus grid in MET over the southeast U.S.?
I want
> to
> > > > look at verification in that area of a certain storm and not
over the
> > > whole
> > > > conus?
> > > >
> > > > Thanks,
> > > >
> > > >
> > > >
> > > > --
> > > > Andrew Kren
> > > > Assistant Scientist
> > > > CIMAS & NOAA/AOML
> > > > 325 Broadway, Boulder, CO 80305
> > > > (303) 497-5418
> > > >
> > > >
> > >
> > >
> >
> >
> > --
> > Andrew Kren
> > Assistant Scientist
> > CIMAS & NOAA/AOML
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> >
>
>
--
Andrew Kren
Assistant Scientist
CIMAS & NOAA/AOML
325 Broadway, Boulder, CO 80305
(303) 497-5418
------------------------------------------------
Subject: Question about merge_thresh
From: John Halley Gotway
Time: Mon Mar 12 11:31:40 2018
Andrew,
Sorry, yes, that's correct. That's how you'd set up the MODE config
file
to point to your new ascii polyline file.
Thanks,
John
On Mon, Mar 12, 2018 at 11:23 AM, Andrew Kren - NOAA Affiliate via RT
<
met_help at ucar.edu> wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
>
> Thanks.
>
> So I'd set poly in the config file to my ascii file? Something like:
>
> mask = {
>
> grid = "";
>
> grid_flag = NONE; // Apply to NONE, FCST, OBS, or BOTH
>
> poly = "/path/to/ascii/file/";
>
> poly_flag = BOTH; // Apply to NONE, FCST, OBS, or BOTH
>
> }
>
>
> On Mon, Mar 12, 2018 at 11:19 AM, John Halley Gotway via RT <
> met_help at ucar.edu> wrote:
>
> > Andrew,
> >
> > Yes, there are several sample lat/lon polyline files included in
the
> > release of MET. You can find them in the installation directory.
Let's
> > say for example, MET is installed in /usr/local/met-6.1, take a
look in:
> > ls /usr/local/met-6.1/share/met/poly
> >
> > For example, the SEC file describes the South East Coast of the
US:
> > head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
> >
> > Just create an ascii file where...
> > (1) The first line is the name of the region
> > (2) All remaining lines contain a latitude and longitude value in
degrees
> > north and degrees east.
> >
> > Then run the result through gen_vx_mask to make sure it's what you
want.
> > For example, let's say you've created TEST.poly
> >
> > met-6.1/bin/gen_vx_mask model_data_file TEST.poly TEST_mask.nc
-type
> > poly
> >
> > ncview TEST_mask.nc
> >
> > Thanks,
> > John
> >
> >
> >
> >
> >
> >
> > On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA Affiliate via
RT <
> > met_help at ucar.edu> wrote:
> >
> > >
> > > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> > >
> > > Thanks John,
> > >
> > > Regarding the ascii lat/lon polyline, is there an example I can
follow.
> > And
> > > how would I pass it to MODE as the mask?
> > >
> > > On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
> > > met_help at ucar.edu> wrote:
> > >
> > > > Hi Andrew,
> > > >
> > > > I see you have some questions about running the MODE tool.
> > > >
> > > > Yes, it really is up to you to decide what sort of
merge_thresh you'd
> > > like
> > > > to use. I can tell you that when running MODE on precip data,
one of
> > our
> > > > scientists set merge_thresh = to 80 or 90% of the conv_thresh.
I
> can't
> > > > remember which. The motivation behind the merge_thresh is
when you
> use
> > > > MODE to define objects for relatively intense events (i.e.
high
> > precip).
> > > > Those intense objects may be part of a larger, more wide-
spread
> system.
> > > > The merge_thresh is intended to group those types of intense
objects
> > > > together.
> > > >
> > > > MET does contain some pre-defined grids that are referenced as
"G#"
> > > where #
> > > > is the grid number. These are currently limited to pre-
defined NCEP
> > > grids:
> > > > http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> > > >
> > > > I don't know if one covers just the southeast CONUS, but my
guess
> would
> > > be
> > > > no.
> > > >
> > > > However, you really are limited to those pre-defined grids.
Really
> > you
> > > > have two choices here... do you want to (1) use your existing
model
> > grid
> > > > and just mask out only the southeast US, or (2) actually
regrid your
> > > > model/obs data to a grid covering only the southeast US.
> > > >
> > > > You'd do (1) by setting a "grid" or "poly" mask in the "mask"
section
> > of
> > > > the MODE config file.
> > > > You'd do (2) by setting the "regrid" section of the MODE
config file.
> > > >
> > > > I'd suggest picking 4 lat/lon points which describe the region
you'd
> > like
> > > > to use and then create an ascii lat/lon polyline and pass it
to MODE
> as
> > > the
> > > > "poly" mask.
> > > >
> > > > Hope that helps.
> > > >
> > > > Thanks,
> > > > John
> > > >
> > > >
> > > > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA Affiliate
via RT
> <
> > > > met_help at ucar.edu> wrote:
> > > >
> > > > >
> > > > > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > > > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > > > Queue: met_help
> > > > > Subject: Question about merge_thresh
> > > > > Owner: Nobody
> > > > > Requestors: andrew.kren at noaa.gov
> > > > > Status: new
> > > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> > Ticket/Display.html?id=84381
> > > >
> > > > >
> > > > >
> > > > > Dear MET help,
> > > > >
> > > > > I am running MODE to verify 24 hr precipitation between obs
and
> > > forecast
> > > > > files. I originally set merge_flag to NONE, but I
understand, from
> a
> > > > > previous discussion with John, that its better to set to
THRESH.
> But
> > if
> > > > > done so, to set a reasonable value for merge_thresh. My
question
> is,
> > > if I
> > > > > set a conv_thresh of 10 mm, can I use half of that for
> merge_thresh,
> > > i.e
> > > > > whatever I have for conv_thresh divided in half? Or do I
have to
> just
> > > > play
> > > > > around with it to see how it is defining objects?
> > > > >
> > > > > Second, is there a conus grid in MET over the southeast
U.S.? I
> want
> > to
> > > > > look at verification in that area of a certain storm and not
over
> the
> > > > whole
> > > > > conus?
> > > > >
> > > > > Thanks,
> > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Andrew Kren
> > > > > Assistant Scientist
> > > > > CIMAS & NOAA/AOML
> > > > > 325 Broadway, Boulder, CO 80305
> > > > > (303) 497-5418
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Andrew Kren
> > > Assistant Scientist
> > > CIMAS & NOAA/AOML
> > > 325 Broadway, Boulder, CO 80305
> > > (303) 497-5418
> > >
> > >
> >
> >
>
>
> --
> Andrew Kren
> Assistant Scientist
> CIMAS & NOAA/AOML
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
>
------------------------------------------------
Subject: Question about merge_thresh
From: Andrew Kren - NOAA Affiliate
Time: Mon Mar 12 11:56:31 2018
Thanks John,
I created the poly file:
SEC
22.0 275.00
22.0 280.00
22.0 285.00
42.0 285.00
42.0 280.00
42.0 275.00
Does this mean it will keep data in this region or mask data in this
region? I'd like to keep the data in this region only.
Thanks much,
On Mon, Mar 12, 2018 at 11:31 AM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Andrew,
>
> Sorry, yes, that's correct. That's how you'd set up the MODE config
file
> to point to your new ascii polyline file.
>
> Thanks,
> John
>
> On Mon, Mar 12, 2018 at 11:23 AM, Andrew Kren - NOAA Affiliate via
RT <
> met_help at ucar.edu> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> >
> > Thanks.
> >
> > So I'd set poly in the config file to my ascii file? Something
like:
> >
> > mask = {
> >
> > grid = "";
> >
> > grid_flag = NONE; // Apply to NONE, FCST, OBS, or BOTH
> >
> > poly = "/path/to/ascii/file/";
> >
> > poly_flag = BOTH; // Apply to NONE, FCST, OBS, or BOTH
> >
> > }
> >
> >
> > On Mon, Mar 12, 2018 at 11:19 AM, John Halley Gotway via RT <
> > met_help at ucar.edu> wrote:
> >
> > > Andrew,
> > >
> > > Yes, there are several sample lat/lon polyline files included in
the
> > > release of MET. You can find them in the installation
directory.
> Let's
> > > say for example, MET is installed in /usr/local/met-6.1, take a
look
> in:
> > > ls /usr/local/met-6.1/share/met/poly
> > >
> > > For example, the SEC file describes the South East Coast of the
US:
> > > head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
> > >
> > > Just create an ascii file where...
> > > (1) The first line is the name of the region
> > > (2) All remaining lines contain a latitude and longitude value
in
> degrees
> > > north and degrees east.
> > >
> > > Then run the result through gen_vx_mask to make sure it's what
you
> want.
> > > For example, let's say you've created TEST.poly
> > >
> > > met-6.1/bin/gen_vx_mask model_data_file TEST.poly
TEST_mask.nc -type
> > > poly
> > >
> > > ncview TEST_mask.nc
> > >
> > > Thanks,
> > > John
> > >
> > >
> > >
> > >
> > >
> > >
> > > On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA Affiliate
via RT <
> > > met_help at ucar.edu> wrote:
> > >
> > > >
> > > > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381
>
> > > >
> > > > Thanks John,
> > > >
> > > > Regarding the ascii lat/lon polyline, is there an example I
can
> follow.
> > > And
> > > > how would I pass it to MODE as the mask?
> > > >
> > > > On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
> > > > met_help at ucar.edu> wrote:
> > > >
> > > > > Hi Andrew,
> > > > >
> > > > > I see you have some questions about running the MODE tool.
> > > > >
> > > > > Yes, it really is up to you to decide what sort of
merge_thresh
> you'd
> > > > like
> > > > > to use. I can tell you that when running MODE on precip
data, one
> of
> > > our
> > > > > scientists set merge_thresh = to 80 or 90% of the
conv_thresh. I
> > can't
> > > > > remember which. The motivation behind the merge_thresh is
when you
> > use
> > > > > MODE to define objects for relatively intense events (i.e.
high
> > > precip).
> > > > > Those intense objects may be part of a larger, more wide-
spread
> > system.
> > > > > The merge_thresh is intended to group those types of intense
> objects
> > > > > together.
> > > > >
> > > > > MET does contain some pre-defined grids that are referenced
as "G#"
> > > > where #
> > > > > is the grid number. These are currently limited to pre-
defined
> NCEP
> > > > grids:
> > > > > http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> > > > >
> > > > > I don't know if one covers just the southeast CONUS, but my
guess
> > would
> > > > be
> > > > > no.
> > > > >
> > > > > However, you really are limited to those pre-defined grids.
> Really
> > > you
> > > > > have two choices here... do you want to (1) use your
existing model
> > > grid
> > > > > and just mask out only the southeast US, or (2) actually
regrid
> your
> > > > > model/obs data to a grid covering only the southeast US.
> > > > >
> > > > > You'd do (1) by setting a "grid" or "poly" mask in the
"mask"
> section
> > > of
> > > > > the MODE config file.
> > > > > You'd do (2) by setting the "regrid" section of the MODE
config
> file.
> > > > >
> > > > > I'd suggest picking 4 lat/lon points which describe the
region
> you'd
> > > like
> > > > > to use and then create an ascii lat/lon polyline and pass it
to
> MODE
> > as
> > > > the
> > > > > "poly" mask.
> > > > >
> > > > > Hope that helps.
> > > > >
> > > > > Thanks,
> > > > > John
> > > > >
> > > > >
> > > > > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA
Affiliate via
> RT
> > <
> > > > > met_help at ucar.edu> wrote:
> > > > >
> > > > > >
> > > > > > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > > > > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > > > > Queue: met_help
> > > > > > Subject: Question about merge_thresh
> > > > > > Owner: Nobody
> > > > > > Requestors: andrew.kren at noaa.gov
> > > > > > Status: new
> > > > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> > > Ticket/Display.html?id=84381
> > > > >
> > > > > >
> > > > > >
> > > > > > Dear MET help,
> > > > > >
> > > > > > I am running MODE to verify 24 hr precipitation between
obs and
> > > > forecast
> > > > > > files. I originally set merge_flag to NONE, but I
understand,
> from
> > a
> > > > > > previous discussion with John, that its better to set to
THRESH.
> > But
> > > if
> > > > > > done so, to set a reasonable value for merge_thresh. My
question
> > is,
> > > > if I
> > > > > > set a conv_thresh of 10 mm, can I use half of that for
> > merge_thresh,
> > > > i.e
> > > > > > whatever I have for conv_thresh divided in half? Or do I
have to
> > just
> > > > > play
> > > > > > around with it to see how it is defining objects?
> > > > > >
> > > > > > Second, is there a conus grid in MET over the southeast
U.S.? I
> > want
> > > to
> > > > > > look at verification in that area of a certain storm and
not over
> > the
> > > > > whole
> > > > > > conus?
> > > > > >
> > > > > > Thanks,
> > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Andrew Kren
> > > > > > Assistant Scientist
> > > > > > CIMAS & NOAA/AOML
> > > > > > 325 Broadway, Boulder, CO 80305
> > > > > > (303) 497-5418
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Andrew Kren
> > > > Assistant Scientist
> > > > CIMAS & NOAA/AOML
> > > > 325 Broadway, Boulder, CO 80305
> > > > (303) 497-5418
> > > >
> > > >
> > >
> > >
> >
> >
> > --
> > Andrew Kren
> > Assistant Scientist
> > CIMAS & NOAA/AOML
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> >
>
>
--
Andrew Kren
Assistant Scientist
CIMAS & NOAA/AOML
325 Broadway, Boulder, CO 80305
(303) 497-5418
------------------------------------------------
Subject: Question about merge_thresh
From: John Halley Gotway
Time: Mon Mar 12 12:08:01 2018
Yes, it keeps the grid points which fall *INSIDE* the region, not
outside.
Typically we specify longitudes as +/- 180 degrees... but the code
*should*
automatically rescale those 180+ longitudes into that range.
John
On Mon, Mar 12, 2018 at 11:56 AM, Andrew Kren - NOAA Affiliate via RT
<
met_help at ucar.edu> wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
>
> Thanks John,
>
> I created the poly file:
>
> SEC
>
> 22.0 275.00
>
> 22.0 280.00
>
> 22.0 285.00
>
> 42.0 285.00
>
> 42.0 280.00
>
> 42.0 275.00
>
> Does this mean it will keep data in this region or mask data in this
> region? I'd like to keep the data in this region only.
>
> Thanks much,
>
> On Mon, Mar 12, 2018 at 11:31 AM, John Halley Gotway via RT <
> met_help at ucar.edu> wrote:
>
> > Andrew,
> >
> > Sorry, yes, that's correct. That's how you'd set up the MODE
config file
> > to point to your new ascii polyline file.
> >
> > Thanks,
> > John
> >
> > On Mon, Mar 12, 2018 at 11:23 AM, Andrew Kren - NOAA Affiliate via
RT <
> > met_help at ucar.edu> wrote:
> >
> > >
> > > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> > >
> > > Thanks.
> > >
> > > So I'd set poly in the config file to my ascii file? Something
like:
> > >
> > > mask = {
> > >
> > > grid = "";
> > >
> > > grid_flag = NONE; // Apply to NONE, FCST, OBS, or BOTH
> > >
> > > poly = "/path/to/ascii/file/";
> > >
> > > poly_flag = BOTH; // Apply to NONE, FCST, OBS, or BOTH
> > >
> > > }
> > >
> > >
> > > On Mon, Mar 12, 2018 at 11:19 AM, John Halley Gotway via RT <
> > > met_help at ucar.edu> wrote:
> > >
> > > > Andrew,
> > > >
> > > > Yes, there are several sample lat/lon polyline files included
in the
> > > > release of MET. You can find them in the installation
directory.
> > Let's
> > > > say for example, MET is installed in /usr/local/met-6.1, take
a look
> > in:
> > > > ls /usr/local/met-6.1/share/met/poly
> > > >
> > > > For example, the SEC file describes the South East Coast of
the US:
> > > > head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
> > > >
> > > > Just create an ascii file where...
> > > > (1) The first line is the name of the region
> > > > (2) All remaining lines contain a latitude and longitude value
in
> > degrees
> > > > north and degrees east.
> > > >
> > > > Then run the result through gen_vx_mask to make sure it's what
you
> > want.
> > > > For example, let's say you've created TEST.poly
> > > >
> > > > met-6.1/bin/gen_vx_mask model_data_file TEST.poly
TEST_mask.nc
> -type
> > > > poly
> > > >
> > > > ncview TEST_mask.nc
> > > >
> > > > Thanks,
> > > > John
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA Affiliate
via
> RT <
> > > > met_help at ucar.edu> wrote:
> > > >
> > > > >
> > > > > <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> > > > >
> > > > > Thanks John,
> > > > >
> > > > > Regarding the ascii lat/lon polyline, is there an example I
can
> > follow.
> > > > And
> > > > > how would I pass it to MODE as the mask?
> > > > >
> > > > > On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT <
> > > > > met_help at ucar.edu> wrote:
> > > > >
> > > > > > Hi Andrew,
> > > > > >
> > > > > > I see you have some questions about running the MODE tool.
> > > > > >
> > > > > > Yes, it really is up to you to decide what sort of
merge_thresh
> > you'd
> > > > > like
> > > > > > to use. I can tell you that when running MODE on precip
data,
> one
> > of
> > > > our
> > > > > > scientists set merge_thresh = to 80 or 90% of the
conv_thresh. I
> > > can't
> > > > > > remember which. The motivation behind the merge_thresh is
when
> you
> > > use
> > > > > > MODE to define objects for relatively intense events (i.e.
high
> > > > precip).
> > > > > > Those intense objects may be part of a larger, more wide-
spread
> > > system.
> > > > > > The merge_thresh is intended to group those types of
intense
> > objects
> > > > > > together.
> > > > > >
> > > > > > MET does contain some pre-defined grids that are
referenced as
> "G#"
> > > > > where #
> > > > > > is the grid number. These are currently limited to pre-
defined
> > NCEP
> > > > > grids:
> > > > > > http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> > > > > >
> > > > > > I don't know if one covers just the southeast CONUS, but
my guess
> > > would
> > > > > be
> > > > > > no.
> > > > > >
> > > > > > However, you really are limited to those pre-defined
grids.
> > Really
> > > > you
> > > > > > have two choices here... do you want to (1) use your
existing
> model
> > > > grid
> > > > > > and just mask out only the southeast US, or (2) actually
regrid
> > your
> > > > > > model/obs data to a grid covering only the southeast US.
> > > > > >
> > > > > > You'd do (1) by setting a "grid" or "poly" mask in the
"mask"
> > section
> > > > of
> > > > > > the MODE config file.
> > > > > > You'd do (2) by setting the "regrid" section of the MODE
config
> > file.
> > > > > >
> > > > > > I'd suggest picking 4 lat/lon points which describe the
region
> > you'd
> > > > like
> > > > > > to use and then create an ascii lat/lon polyline and pass
it to
> > MODE
> > > as
> > > > > the
> > > > > > "poly" mask.
> > > > > >
> > > > > > Hope that helps.
> > > > > >
> > > > > > Thanks,
> > > > > > John
> > > > > >
> > > > > >
> > > > > > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA
Affiliate via
> > RT
> > > <
> > > > > > met_help at ucar.edu> wrote:
> > > > > >
> > > > > > >
> > > > > > > Fri Mar 09 11:06:56 2018: Request 84381 was acted upon.
> > > > > > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > > > > > Queue: met_help
> > > > > > > Subject: Question about merge_thresh
> > > > > > > Owner: Nobody
> > > > > > > Requestors: andrew.kren at noaa.gov
> > > > > > > Status: new
> > > > > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> > > > Ticket/Display.html?id=84381
> > > > > >
> > > > > > >
> > > > > > >
> > > > > > > Dear MET help,
> > > > > > >
> > > > > > > I am running MODE to verify 24 hr precipitation between
obs and
> > > > > forecast
> > > > > > > files. I originally set merge_flag to NONE, but I
understand,
> > from
> > > a
> > > > > > > previous discussion with John, that its better to set to
> THRESH.
> > > But
> > > > if
> > > > > > > done so, to set a reasonable value for merge_thresh. My
> question
> > > is,
> > > > > if I
> > > > > > > set a conv_thresh of 10 mm, can I use half of that for
> > > merge_thresh,
> > > > > i.e
> > > > > > > whatever I have for conv_thresh divided in half? Or do I
have
> to
> > > just
> > > > > > play
> > > > > > > around with it to see how it is defining objects?
> > > > > > >
> > > > > > > Second, is there a conus grid in MET over the southeast
U.S.? I
> > > want
> > > > to
> > > > > > > look at verification in that area of a certain storm and
not
> over
> > > the
> > > > > > whole
> > > > > > > conus?
> > > > > > >
> > > > > > > Thanks,
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > --
> > > > > > > Andrew Kren
> > > > > > > Assistant Scientist
> > > > > > > CIMAS & NOAA/AOML
> > > > > > > 325 Broadway, Boulder, CO 80305
> > > > > > > (303) 497-5418
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > > --
> > > > > Andrew Kren
> > > > > Assistant Scientist
> > > > > CIMAS & NOAA/AOML
> > > > > 325 Broadway, Boulder, CO 80305
> > > > > (303) 497-5418
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > > --
> > > Andrew Kren
> > > Assistant Scientist
> > > CIMAS & NOAA/AOML
> > > 325 Broadway, Boulder, CO 80305
> > > (303) 497-5418
> > >
> > >
> >
> >
>
>
> --
> Andrew Kren
> Assistant Scientist
> CIMAS & NOAA/AOML
> 325 Broadway, Boulder, CO 80305
> (303) 497-5418
>
>
------------------------------------------------
Subject: Question about merge_thresh
From: Andrew Kren - NOAA Affiliate
Time: Mon Mar 12 12:10:01 2018
Thanks John
On Mon, Mar 12, 2018 at 12:08 PM, John Halley Gotway via RT <
met_help at ucar.edu> wrote:
> Yes, it keeps the grid points which fall *INSIDE* the region, not
outside.
> Typically we specify longitudes as +/- 180 degrees... but the code
*should*
> automatically rescale those 180+ longitudes into that range.
>
> John
>
> On Mon, Mar 12, 2018 at 11:56 AM, Andrew Kren - NOAA Affiliate via
RT <
> met_help at ucar.edu> wrote:
>
> >
> > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> >
> > Thanks John,
> >
> > I created the poly file:
> >
> > SEC
> >
> > 22.0 275.00
> >
> > 22.0 280.00
> >
> > 22.0 285.00
> >
> > 42.0 285.00
> >
> > 42.0 280.00
> >
> > 42.0 275.00
> >
> > Does this mean it will keep data in this region or mask data in
this
> > region? I'd like to keep the data in this region only.
> >
> > Thanks much,
> >
> > On Mon, Mar 12, 2018 at 11:31 AM, John Halley Gotway via RT <
> > met_help at ucar.edu> wrote:
> >
> > > Andrew,
> > >
> > > Sorry, yes, that's correct. That's how you'd set up the MODE
config
> file
> > > to point to your new ascii polyline file.
> > >
> > > Thanks,
> > > John
> > >
> > > On Mon, Mar 12, 2018 at 11:23 AM, Andrew Kren - NOAA Affiliate
via RT <
> > > met_help at ucar.edu> wrote:
> > >
> > > >
> > > > <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381
>
> > > >
> > > > Thanks.
> > > >
> > > > So I'd set poly in the config file to my ascii file? Something
like:
> > > >
> > > > mask = {
> > > >
> > > > grid = "";
> > > >
> > > > grid_flag = NONE; // Apply to NONE, FCST, OBS, or BOTH
> > > >
> > > > poly = "/path/to/ascii/file/";
> > > >
> > > > poly_flag = BOTH; // Apply to NONE, FCST, OBS, or BOTH
> > > >
> > > > }
> > > >
> > > >
> > > > On Mon, Mar 12, 2018 at 11:19 AM, John Halley Gotway via RT <
> > > > met_help at ucar.edu> wrote:
> > > >
> > > > > Andrew,
> > > > >
> > > > > Yes, there are several sample lat/lon polyline files
included in
> the
> > > > > release of MET. You can find them in the installation
directory.
> > > Let's
> > > > > say for example, MET is installed in /usr/local/met-6.1,
take a
> look
> > > in:
> > > > > ls /usr/local/met-6.1/share/met/poly
> > > > >
> > > > > For example, the SEC file describes the South East Coast of
the US:
> > > > > head -5 /usr/local/met-6.1/share/met/poly/SEC.poly
> > > > >
> > > > > Just create an ascii file where...
> > > > > (1) The first line is the name of the region
> > > > > (2) All remaining lines contain a latitude and longitude
value in
> > > degrees
> > > > > north and degrees east.
> > > > >
> > > > > Then run the result through gen_vx_mask to make sure it's
what you
> > > want.
> > > > > For example, let's say you've created TEST.poly
> > > > >
> > > > > met-6.1/bin/gen_vx_mask model_data_file TEST.poly
TEST_mask.nc
> > -type
> > > > > poly
> > > > >
> > > > > ncview TEST_mask.nc
> > > > >
> > > > > Thanks,
> > > > > John
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > On Mon, Mar 12, 2018 at 10:27 AM, Andrew Kren - NOAA
Affiliate via
> > RT <
> > > > > met_help at ucar.edu> wrote:
> > > > >
> > > > > >
> > > > > > <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=84381 >
> > > > > >
> > > > > > Thanks John,
> > > > > >
> > > > > > Regarding the ascii lat/lon polyline, is there an example
I can
> > > follow.
> > > > > And
> > > > > > how would I pass it to MODE as the mask?
> > > > > >
> > > > > > On Mon, Mar 12, 2018 at 9:47 AM, John Halley Gotway via RT
<
> > > > > > met_help at ucar.edu> wrote:
> > > > > >
> > > > > > > Hi Andrew,
> > > > > > >
> > > > > > > I see you have some questions about running the MODE
tool.
> > > > > > >
> > > > > > > Yes, it really is up to you to decide what sort of
merge_thresh
> > > you'd
> > > > > > like
> > > > > > > to use. I can tell you that when running MODE on precip
data,
> > one
> > > of
> > > > > our
> > > > > > > scientists set merge_thresh = to 80 or 90% of the
> conv_thresh. I
> > > > can't
> > > > > > > remember which. The motivation behind the merge_thresh
is when
> > you
> > > > use
> > > > > > > MODE to define objects for relatively intense events
(i.e. high
> > > > > precip).
> > > > > > > Those intense objects may be part of a larger, more
wide-spread
> > > > system.
> > > > > > > The merge_thresh is intended to group those types of
intense
> > > objects
> > > > > > > together.
> > > > > > >
> > > > > > > MET does contain some pre-defined grids that are
referenced as
> > "G#"
> > > > > > where #
> > > > > > > is the grid number. These are currently limited to pre-
defined
> > > NCEP
> > > > > > grids:
> > > > > > >
http://www.nco.ncep.noaa.gov/pmb/docs/on388/tableb.html
> > > > > > >
> > > > > > > I don't know if one covers just the southeast CONUS, but
my
> guess
> > > > would
> > > > > > be
> > > > > > > no.
> > > > > > >
> > > > > > > However, you really are limited to those pre-defined
grids.
> > > Really
> > > > > you
> > > > > > > have two choices here... do you want to (1) use your
existing
> > model
> > > > > grid
> > > > > > > and just mask out only the southeast US, or (2) actually
regrid
> > > your
> > > > > > > model/obs data to a grid covering only the southeast US.
> > > > > > >
> > > > > > > You'd do (1) by setting a "grid" or "poly" mask in the
"mask"
> > > section
> > > > > of
> > > > > > > the MODE config file.
> > > > > > > You'd do (2) by setting the "regrid" section of the MODE
config
> > > file.
> > > > > > >
> > > > > > > I'd suggest picking 4 lat/lon points which describe the
region
> > > you'd
> > > > > like
> > > > > > > to use and then create an ascii lat/lon polyline and
pass it to
> > > MODE
> > > > as
> > > > > > the
> > > > > > > "poly" mask.
> > > > > > >
> > > > > > > Hope that helps.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > John
> > > > > > >
> > > > > > >
> > > > > > > On Fri, Mar 9, 2018 at 11:06 AM, Andrew Kren - NOAA
Affiliate
> via
> > > RT
> > > > <
> > > > > > > met_help at ucar.edu> wrote:
> > > > > > >
> > > > > > > >
> > > > > > > > Fri Mar 09 11:06:56 2018: Request 84381 was acted
upon.
> > > > > > > > Transaction: Ticket created by andrew.kren at noaa.gov
> > > > > > > > Queue: met_help
> > > > > > > > Subject: Question about merge_thresh
> > > > > > > > Owner: Nobody
> > > > > > > > Requestors: andrew.kren at noaa.gov
> > > > > > > > Status: new
> > > > > > > > Ticket <URL: https://rt.rap.ucar.edu/rt/
> > > > > Ticket/Display.html?id=84381
> > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > Dear MET help,
> > > > > > > >
> > > > > > > > I am running MODE to verify 24 hr precipitation
between obs
> and
> > > > > > forecast
> > > > > > > > files. I originally set merge_flag to NONE, but I
understand,
> > > from
> > > > a
> > > > > > > > previous discussion with John, that its better to set
to
> > THRESH.
> > > > But
> > > > > if
> > > > > > > > done so, to set a reasonable value for merge_thresh.
My
> > question
> > > > is,
> > > > > > if I
> > > > > > > > set a conv_thresh of 10 mm, can I use half of that for
> > > > merge_thresh,
> > > > > > i.e
> > > > > > > > whatever I have for conv_thresh divided in half? Or do
I have
> > to
> > > > just
> > > > > > > play
> > > > > > > > around with it to see how it is defining objects?
> > > > > > > >
> > > > > > > > Second, is there a conus grid in MET over the
southeast
> U.S.? I
> > > > want
> > > > > to
> > > > > > > > look at verification in that area of a certain storm
and not
> > over
> > > > the
> > > > > > > whole
> > > > > > > > conus?
> > > > > > > >
> > > > > > > > Thanks,
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > --
> > > > > > > > Andrew Kren
> > > > > > > > Assistant Scientist
> > > > > > > > CIMAS & NOAA/AOML
> > > > > > > > 325 Broadway, Boulder, CO 80305
> > > > > > > > (303) 497-5418
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > > --
> > > > > > Andrew Kren
> > > > > > Assistant Scientist
> > > > > > CIMAS & NOAA/AOML
> > > > > > 325 Broadway, Boulder, CO 80305
> > > > > > (303) 497-5418
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > > --
> > > > Andrew Kren
> > > > Assistant Scientist
> > > > CIMAS & NOAA/AOML
> > > > 325 Broadway, Boulder, CO 80305
> > > > (303) 497-5418
> > > >
> > > >
> > >
> > >
> >
> >
> > --
> > Andrew Kren
> > Assistant Scientist
> > CIMAS & NOAA/AOML
> > 325 Broadway, Boulder, CO 80305
> > (303) 497-5418
> >
> >
>
>
--
Andrew Kren
Assistant Scientist
CIMAS & NOAA/AOML
325 Broadway, Boulder, CO 80305
(303) 497-5418
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