[Met_help] [rt.rap.ucar.edu #81646] History for setting quality marks of obs in MET
Julie Prestopnik via RT
met_help at ucar.edu
Thu Aug 17 11:44:50 MDT 2017
----------------------------------------------------------------
Initial Request
----------------------------------------------------------------
Hi, there,
Tara had told me that when I need to compare my VSDB verification with MET
verification, that I need to use the same quality marks that are used in
VSDB in MET. So she told me that I needed to set, in the point_stat config
file, the variable:
obs_quality = [];
to something that reflects that I want to keep all quality marks of 3 or
less, so that should be set to:
obs_quality = ["0", "1", "2", "3"];
Is this correct? And can I set a different obs_quality setting differently
for different variables in the same configuration file?
What we did not talk about but I noticed in the PB2NC config file, there is
this variable:
quality_mark_thresh = 2
What does this mean and what should it be set to, so I keep all obs with a
quality mark of 3 or less?
Thanks!
Perry
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Complete Ticket History
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Subject: setting quality marks of obs in MET
From: Julie Prestopnik
Time: Thu Aug 17 10:21:03 2017
Hi Perry.
Yes. What you sent for obs_quality is correct.
The following information is from our User's Guide
(http://www.dtcenter.org/met/users/docs/users_guide/MET_Users_Guide_v6.0.pdf
):
// The "obs_quality" entry specifies the quality flag values that are
to be
// retained and used for verification. An empty list signifies that
all
// point observations should be used, regardless of their quality flag
value.
// The quality flag values will vary depending on the original source
of the
// observations. The quality flag values to retain should be
specified as
// an array of strings, even if the values themselves are numeric.
//
obs_quality = [ "1", "2", "3", "9" ];
And yes, you can set a different obs_quality setting for each variable
in
the obs.field entry. So, for example:
obs = {
field = [
{
name = "SPFH";
level = [ "P500" ];
cat_thresh = [ >80.0 ];
obs_quality = [ "1", "2", "9" ];
},
{
name = "TMP";
level = [ "P500" ];
cat_thresh = [ >273.0 ];
obs_quality = [ "1", "2", "3", "4", "9" ];
}
];
Regarding the "quality_mark_thresh" setting, also from our User's
Guide:
"Each observation has a quality mark value associated with it. The
*quality_mark_thresh* is used to stratify out which quality marks will
be
retained."
Setting quality_mark_thresh =2, indicates that only observations with
quality marks less than or equal to 2 will be retained. So, if you
would
like to keep all obs with a a quality mark of 3 or less, you would set
it
to 3:
quality_mark_thresh = 3
I hope that helps! Please let us know if you have any other
questions.
Julie
On Thu, Aug 17, 2017 at 8:43 AM, perry.shafran at noaa.gov via RT <
met_help at ucar.edu> wrote:
>
> Thu Aug 17 08:43:13 2017: Request 81646 was acted upon.
> Transaction: Ticket created by perry.shafran at noaa.gov
> Queue: met_help
> Subject: setting quality marks of obs in MET
> Owner: Nobody
> Requestors: perry.shafran at noaa.gov
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81646 >
>
>
> Hi, there,
>
> Tara had told me that when I need to compare my VSDB verification
with MET
> verification, that I need to use the same quality marks that are
used in
> VSDB in MET. So she told me that I needed to set, in the point_stat
config
> file, the variable:
>
> obs_quality = [];
>
> to something that reflects that I want to keep all quality marks of
3 or
> less, so that should be set to:
>
> obs_quality = ["0", "1", "2", "3"];
>
> Is this correct? And can I set a different obs_quality setting
differently
> for different variables in the same configuration file?
>
> What we did not talk about but I noticed in the PB2NC config file,
there is
> this variable:
>
> quality_mark_thresh = 2
>
> What does this mean and what should it be set to, so I keep all obs
with a
> quality mark of 3 or less?
>
> Thanks!
>
> Perry
>
>
------------------------------------------------
Subject: setting quality marks of obs in MET
From: perry.shafran at noaa.gov
Time: Thu Aug 17 10:24:53 2017
Hi, Julie,
Thanks! Yes that does help. I should probably set both flags, one in
each
routine.
Perry
On Thu, Aug 17, 2017 at 12:21 PM, Julie Prestopnik via RT
<met_help at ucar.edu
> wrote:
> Hi Perry.
>
> Yes. What you sent for obs_quality is correct.
>
> The following information is from our User's Guide
> (http://www.dtcenter.org/met/users/docs/users_guide/MET_
> Users_Guide_v6.0.pdf
> ):
>
> // The "obs_quality" entry specifies the quality flag values that
are to be
> // retained and used for verification. An empty list signifies that
all
> // point observations should be used, regardless of their quality
flag
> value.
> // The quality flag values will vary depending on the original
source of
> the
> // observations. The quality flag values to retain should be
specified as
> // an array of strings, even if the values themselves are numeric.
> //
> obs_quality = [ "1", "2", "3", "9" ];
>
> And yes, you can set a different obs_quality setting for each
variable in
> the obs.field entry. So, for example:
>
> obs = {
> field = [
> {
> name = "SPFH";
> level = [ "P500" ];
> cat_thresh = [ >80.0 ];
> obs_quality = [ "1", "2", "9" ];
> },
>
> {
> name = "TMP";
> level = [ "P500" ];
> cat_thresh = [ >273.0 ];
> obs_quality = [ "1", "2", "3", "4", "9" ];
> }
> ];
>
> Regarding the "quality_mark_thresh" setting, also from our User's
Guide:
>
> "Each observation has a quality mark value associated with it. The
> *quality_mark_thresh* is used to stratify out which quality marks
will be
> retained."
>
> Setting quality_mark_thresh =2, indicates that only observations
with
> quality marks less than or equal to 2 will be retained. So, if you
would
> like to keep all obs with a a quality mark of 3 or less, you would
set it
> to 3:
>
> quality_mark_thresh = 3
>
> I hope that helps! Please let us know if you have any other
questions.
>
> Julie
>
>
>
> On Thu, Aug 17, 2017 at 8:43 AM, perry.shafran at noaa.gov via RT <
> met_help at ucar.edu> wrote:
>
> >
> > Thu Aug 17 08:43:13 2017: Request 81646 was acted upon.
> > Transaction: Ticket created by perry.shafran at noaa.gov
> > Queue: met_help
> > Subject: setting quality marks of obs in MET
> > Owner: Nobody
> > Requestors: perry.shafran at noaa.gov
> > Status: new
> > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81646 >
> >
> >
> > Hi, there,
> >
> > Tara had told me that when I need to compare my VSDB verification
with
> MET
> > verification, that I need to use the same quality marks that are
used in
> > VSDB in MET. So she told me that I needed to set, in the
point_stat
> config
> > file, the variable:
> >
> > obs_quality = [];
> >
> > to something that reflects that I want to keep all quality marks
of 3 or
> > less, so that should be set to:
> >
> > obs_quality = ["0", "1", "2", "3"];
> >
> > Is this correct? And can I set a different obs_quality setting
> differently
> > for different variables in the same configuration file?
> >
> > What we did not talk about but I noticed in the PB2NC config file,
there
> is
> > this variable:
> >
> > quality_mark_thresh = 2
> >
> > What does this mean and what should it be set to, so I keep all
obs with
> a
> > quality mark of 3 or less?
> >
> > Thanks!
> >
> > Perry
> >
> >
>
>
------------------------------------------------
Subject: setting quality marks of obs in MET
From: Julie Prestopnik
Time: Thu Aug 17 11:44:36 2017
Great, Perry. I'll go ahead and closet this ticket.
Julie
On Thu, Aug 17, 2017 at 10:24 AM, perry.shafran at noaa.gov via RT <
met_help at ucar.edu> wrote:
>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81646 >
>
> Hi, Julie,
>
> Thanks! Yes that does help. I should probably set both flags, one
in each
> routine.
>
> Perry
>
> On Thu, Aug 17, 2017 at 12:21 PM, Julie Prestopnik via RT <
> met_help at ucar.edu
> > wrote:
>
> > Hi Perry.
> >
> > Yes. What you sent for obs_quality is correct.
> >
> > The following information is from our User's Guide
> > (http://www.dtcenter.org/met/users/docs/users_guide/MET_
> > Users_Guide_v6.0.pdf
> > ):
> >
> > // The "obs_quality" entry specifies the quality flag values that
are to
> be
> > // retained and used for verification. An empty list signifies
that all
> > // point observations should be used, regardless of their quality
flag
> > value.
> > // The quality flag values will vary depending on the original
source of
> > the
> > // observations. The quality flag values to retain should be
specified
> as
> > // an array of strings, even if the values themselves are numeric.
> > //
> > obs_quality = [ "1", "2", "3", "9" ];
> >
> > And yes, you can set a different obs_quality setting for each
variable in
> > the obs.field entry. So, for example:
> >
> > obs = {
> > field = [
> > {
> > name = "SPFH";
> > level = [ "P500" ];
> > cat_thresh = [ >80.0 ];
> > obs_quality = [ "1", "2", "9" ];
> > },
> >
> > {
> > name = "TMP";
> > level = [ "P500" ];
> > cat_thresh = [ >273.0 ];
> > obs_quality = [ "1", "2", "3", "4", "9" ];
> > }
> > ];
> >
> > Regarding the "quality_mark_thresh" setting, also from our User's
Guide:
> >
> > "Each observation has a quality mark value associated with it.
The
> > *quality_mark_thresh* is used to stratify out which quality marks
will be
> > retained."
> >
> > Setting quality_mark_thresh =2, indicates that only observations
with
> > quality marks less than or equal to 2 will be retained. So, if
you would
> > like to keep all obs with a a quality mark of 3 or less, you would
set it
> > to 3:
> >
> > quality_mark_thresh = 3
> >
> > I hope that helps! Please let us know if you have any other
questions.
> >
> > Julie
> >
> >
> >
> > On Thu, Aug 17, 2017 at 8:43 AM, perry.shafran at noaa.gov via RT <
> > met_help at ucar.edu> wrote:
> >
> > >
> > > Thu Aug 17 08:43:13 2017: Request 81646 was acted upon.
> > > Transaction: Ticket created by perry.shafran at noaa.gov
> > > Queue: met_help
> > > Subject: setting quality marks of obs in MET
> > > Owner: Nobody
> > > Requestors: perry.shafran at noaa.gov
> > > Status: new
> > > Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=81646
> >
> > >
> > >
> > > Hi, there,
> > >
> > > Tara had told me that when I need to compare my VSDB
verification with
> > MET
> > > verification, that I need to use the same quality marks that are
used
> in
> > > VSDB in MET. So she told me that I needed to set, in the
point_stat
> > config
> > > file, the variable:
> > >
> > > obs_quality = [];
> > >
> > > to something that reflects that I want to keep all quality marks
of 3
> or
> > > less, so that should be set to:
> > >
> > > obs_quality = ["0", "1", "2", "3"];
> > >
> > > Is this correct? And can I set a different obs_quality setting
> > differently
> > > for different variables in the same configuration file?
> > >
> > > What we did not talk about but I noticed in the PB2NC config
file,
> there
> > is
> > > this variable:
> > >
> > > quality_mark_thresh = 2
> > >
> > > What does this mean and what should it be set to, so I keep all
obs
> with
> > a
> > > quality mark of 3 or less?
> > >
> > > Thanks!
> > >
> > > Perry
> > >
> > >
> >
> >
>
>
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