[Met_help] [rt.rap.ucar.edu #90496] History for MODE
John Halley Gotway via RT
met_help at ucar.edu
Wed Jul 10 17:01:12 MDT 2019
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Initial Request
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Hi!
I have some questions about MODE.
In aranda_data, I put the configure file and a postscript file.
1) Interest Function:
I use the same Interest Function configure that in the configure default.
I know that to calculate the total interest equation I need the
information to the Interest maps and the confidence maps for attributes. is
the interest function that appears in the MODE configuration file, the same
that the Interest maps defined in the METv7.0 User's Guide (page 267)?
where I could find information about the confidence maps? METv7.0 User's
Guide says: all of the confidence maps except the map for axis angle are
set to a constant value of 1 and this is because the axis angle attribute
depends on the the aspect ratio. How can I see the confidence maps in the
MODE configuration file?
Also, I read *The Method for Object-Based Diagnostic Evaluation (MODE)
Applied to Numerical Forecasts from the 2005 NSSL/SPC Spring Program* paper
and in this paper, in the Appendix A, there is an Interest maps graphic. Is
this the interest maps that MET v7.0 use to describe the objects or is for
an specific case?
2) angle difference:
the angle difference is the difference between two axis objects. In my case
I want to verify the precipitation WRF model and for that I compare these
with the precipitation estimates from the IMERG FR.
In the postscript, for the cluster number , the angle difference is 3,25°.
So is this the angle that the long axis of the WRF object makes with
respect to the IMERG object? Could I say that the forecast object is
northern than the observation object? and if the forecast object is in the
south respect to the observation object?
Thanks,
Natalí
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Complete Ticket History
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Subject: MODE
From: Minna Win
Time: Thu Jun 06 09:05:58 2019
Hello Natali,
It looks like you have some questions about MODE. This ticket is
being
assigned to Randy Bullock, our resident MODE and MODE TD expert.
Please
allow a few days for a full response. Thank you for your patience.
Regards,
Minna
---------------
Minna Win
NCAR
Research Applications Lab
Phone: 303-497-8423
Fax: 303-497-8401
On Wed, Jun 5, 2019 at 7:02 PM natali aranda via RT
<met_help at ucar.edu>
wrote:
>
> Wed Jun 05 19:01:51 2019: Request 90496 was acted upon.
> Transaction: Ticket created by natali.g.aranda at gmail.com
> Queue: met_help
> Subject: MODE
> Owner: Nobody
> Requestors: natali.g.aranda at gmail.com
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=90496 >
>
>
> Hi!
>
> I have some questions about MODE.
> In aranda_data, I put the configure file and a postscript file.
>
> 1) Interest Function:
> I use the same Interest Function configure that in the configure
default.
> I know that to calculate the total interest equation I need the
> information to the Interest maps and the confidence maps for
attributes. is
> the interest function that appears in the MODE configuration file,
the same
> that the Interest maps defined in the METv7.0 User's Guide (page
267)?
>
> where I could find information about the confidence maps? METv7.0
User's
> Guide says: all of the confidence maps except the map for axis angle
are
> set to a constant value of 1 and this is because the axis angle
attribute
> depends on the the aspect ratio. How can I see the confidence maps
in the
> MODE configuration file?
>
> Also, I read *The Method for Object-Based Diagnostic Evaluation
(MODE)
> Applied to Numerical Forecasts from the 2005 NSSL/SPC Spring
Program* paper
> and in this paper, in the Appendix A, there is an Interest maps
graphic. Is
> this the interest maps that MET v7.0 use to describe the objects or
is for
> an specific case?
>
> 2) angle difference:
> the angle difference is the difference between two axis objects. In
my case
> I want to verify the precipitation WRF model and for that I compare
these
> with the precipitation estimates from the IMERG FR.
>
> In the postscript, for the cluster number , the angle difference is
3,25°.
> So is this the angle that the long axis of the WRF object makes
with
> respect to the IMERG object? Could I say that the forecast object is
> northern than the observation object? and if the forecast object is
in the
> south respect to the observation object?
>
>
> Thanks,
>
> Natalí
>
>
------------------------------------------------
Subject: MODE
From: Randy Bullock
Time: Fri Jun 07 12:52:45 2019
Hi Natali -
You asked a lot of questions in your email. Let me see if I can
answer
them for you.
First of all, there isn't much information about the confidence maps
that
MODE uses, simply because (to my knowledge) nobody ever changes them.
That
said, however, you can certainly change them if you want to. The
confidence maps are piecewise linear functions (see wikipedia link
here
<https://en.wikipedia.org/wiki/Piecewise_linear_function> for more
information on these), and so in the MODE config file, we just list
the
corner points (x, y) on the graph of the function, and the code (C++
class,
actually) that encapsulates them knows that it needs to do linear
interpolation between the given corner points.
The interest map graphics in the journal article you mentioned were
tuned
for that specific case, and are probably not the MODE default maps.
The axis angle is the (arctangent of the) slope of a line fitted to
the
object. If you have two objects, then you have two axis lines, and
the
axis angle difference is the smaller of the two angles that the lines
make
when they intersect.
As for saying that one object is more northerly (or southerly) than
another
object, I think that the object centroid might be a better way to
measure
this, rather than the axis.
Hope this helps.
Randy Bullock
On Wed, Jun 5, 2019 at 7:02 PM natali aranda via RT
<met_help at ucar.edu>
wrote:
>
> Wed Jun 05 19:01:51 2019: Request 90496 was acted upon.
> Transaction: Ticket created by natali.g.aranda at gmail.com
> Queue: met_help
> Subject: MODE
> Owner: Nobody
> Requestors: natali.g.aranda at gmail.com
> Status: new
> Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=90496 >
>
>
> Hi!
>
> I have some questions about MODE.
> In aranda_data, I put the configure file and a postscript file.
>
> 1) Interest Function:
> I use the same Interest Function configure that in the configure
default.
> I know that to calculate the total interest equation I need the
> information to the Interest maps and the confidence maps for
attributes. is
> the interest function that appears in the MODE configuration file,
the same
> that the Interest maps defined in the METv7.0 User's Guide (page
267)?
>
> where I could find information about the confidence maps? METv7.0
User's
> Guide says: all of the confidence maps except the map for axis angle
are
> set to a constant value of 1 and this is because the axis angle
attribute
> depends on the the aspect ratio. How can I see the confidence maps
in the
> MODE configuration file?
>
> Also, I read *The Method for Object-Based Diagnostic Evaluation
(MODE)
> Applied to Numerical Forecasts from the 2005 NSSL/SPC Spring
Program* paper
> and in this paper, in the Appendix A, there is an Interest maps
graphic. Is
> this the interest maps that MET v7.0 use to describe the objects or
is for
> an specific case?
>
> 2) angle difference:
> the angle difference is the difference between two axis objects. In
my case
> I want to verify the precipitation WRF model and for that I compare
these
> with the precipitation estimates from the IMERG FR.
>
> In the postscript, for the cluster number , the angle difference is
3,25°.
> So is this the angle that the long axis of the WRF object makes
with
> respect to the IMERG object? Could I say that the forecast object is
> northern than the observation object? and if the forecast object is
in the
> south respect to the observation object?
>
>
> Thanks,
>
> Natalí
>
>
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