[Met_help] [rt.rap.ucar.edu #85328] History for distances in met-tc

[John Halley Gotway via RT]

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  Initial Request
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We have a verification program for TC tracks (and other parameters) that 
is similar to met-tc with some additions.  We recently noticed that it 
can't accurately calculate distances across Greenwich; if we correct 
this problem, it can't accurately calculate distances across the 
dateline.  After testing with met-tc, it appears that the code can 
calculate the distances properly.

Can you provide the equations used to calculate distances in the code, 
or, alternatively, the subroutine in which distances are calculated?

Thanks,
Sim


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  Complete Ticket History
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Subject: distances in met-tc
From: Minna Win
Time: Tue May 29 13:20:42 2018

Hello Sim,

I will try to find any documentation or whitepapers where this
information
is published.  This might take some time, as a significant number of
the
MET staff who know where this information resides are out of the
office
this week.

Regards,
Minna

---------------
Minna Win
NCAR
Research Applications Lab
Phone: 303-497-8423
Fax:   302-497-8401


On Tue, May 29, 2018 at 6:33 PM, sim.aberson via RT
<met_help at ucar.edu>
wrote:

>
> Tue May 29 12:33:03 2018: Request 85328 was acted upon.
> Transaction: Ticket created by sim.aberson at noaa.gov
>        Queue: met_help
>      Subject: distances in met-tc
>        Owner: Nobody
>   Requestors: sim.aberson at noaa.gov
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85328 >
>
>
> We have a verification program for TC tracks (and other parameters)
that
> is similar to met-tc with some additions.  We recently noticed that
it
> can't accurately calculate distances across Greenwich; if we correct
> this problem, it can't accurately calculate distances across the
> dateline.  After testing with met-tc, it appears that the code can
> calculate the distances properly.
>
> Can you provide the equations used to calculate distances in the
code,
> or, alternatively, the subroutine in which distances are calculated?
>
> Thanks,
> Sim
>
>

------------------------------------------------
Subject: distances in met-tc
From: Minna Win
Time: Tue May 29 14:19:25 2018

Hello Sim,

One of the MET engineers has created a whitepaper on how distances are
calculated in MET.  Here is the link to the paper:
https://dtcenter.org/met/users/docs/write_ups/gc_simple.pdf
I hope this is helpful.  Please let us know you have any additional
questions.

Regards,
Minna

---------------
Minna Win
NCAR
Research Applications Lab
Phone: 303-497-8423
Fax:   302-497-8401


On Tue, May 29, 2018 at 6:33 PM, sim.aberson via RT
<met_help at ucar.edu>
wrote:

>
> Tue May 29 12:33:03 2018: Request 85328 was acted upon.
> Transaction: Ticket created by sim.aberson at noaa.gov
>        Queue: met_help
>      Subject: distances in met-tc
>        Owner: Nobody
>   Requestors: sim.aberson at noaa.gov
>       Status: new
>  Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85328 >
>
>
> We have a verification program for TC tracks (and other parameters)
that
> is similar to met-tc with some additions.  We recently noticed that
it
> can't accurately calculate distances across Greenwich; if we correct
> this problem, it can't accurately calculate distances across the
> dateline.  After testing with met-tc, it appears that the code can
> calculate the distances properly.
>
> Can you provide the equations used to calculate distances in the
code,
> or, alternatively, the subroutine in which distances are calculated?
>
> Thanks,
> Sim
>
>

------------------------------------------------
Subject: Re: [rt.rap.ucar.edu #85328] distances in met-tc
From: sim.aberson
Time: Wed May 30 07:45:34 2018

Thanks!  This is exactly what is needed.  It's interesting that the
longitudes are the negative of what is usually done here.

Sim

On 5/29/18 4:19 PM, Minna Win via RT wrote:
> Hello Sim,
>
> One of the MET engineers has created a whitepaper on how distances
are
> calculated in MET.  Here is the link to the paper:
> https://dtcenter.org/met/users/docs/write_ups/gc_simple.pdf
> I hope this is helpful.  Please let us know you have any additional
> questions.
>
> Regards,
> Minna
>
> ---------------
> Minna Win
> NCAR
> Research Applications Lab
> Phone: 303-497-8423
> Fax:   302-497-8401
>
>
> On Tue, May 29, 2018 at 6:33 PM, sim.aberson via RT
<met_help at ucar.edu>
> wrote:
>
>>
>> Tue May 29 12:33:03 2018: Request 85328 was acted upon.
>> Transaction: Ticket created by sim.aberson at noaa.gov
>>         Queue: met_help
>>       Subject: distances in met-tc
>>         Owner: Nobody
>>    Requestors: sim.aberson at noaa.gov
>>        Status: new
>>   Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85328 >
>>
>>
>> We have a verification program for TC tracks (and other parameters)
that
>> is similar to met-tc with some additions.  We recently noticed that
it
>> can't accurately calculate distances across Greenwich; if we
correct
>> this problem, it can't accurately calculate distances across the
>> dateline.  After testing with met-tc, it appears that the code can
>> calculate the distances properly.
>>
>> Can you provide the equations used to calculate distances in the
code,
>> or, alternatively, the subroutine in which distances are
calculated?
>>
>> Thanks,
>> Sim
>>
>>
>


------------------------------------------------
Subject: distances in met-tc
From: Minna Win
Time: Wed May 30 09:53:04 2018

Resolved.

------------------------------------------------
Subject: distances in met-tc
From: Minna Win
Time: Wed May 30 09:53:23 2018

Hi Sim,

I'm glad that was helpful.  Please don't hesitate to contact us if you
have
any other MET-related questions.

Regards,
Minna

---------------
Minna Win
NCAR
Research Applications Lab
Phone: 303-497-8423
Fax:   302-497-8401


On Wed, May 30, 2018 at 1:45 PM, sim.aberson via RT
<met_help at ucar.edu>
wrote:

>
> <URL: https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85328 >
>
> Thanks!  This is exactly what is needed.  It's interesting that the
> longitudes are the negative of what is usually done here.
>
> Sim
>
> On 5/29/18 4:19 PM, Minna Win via RT wrote:
> > Hello Sim,
> >
> > One of the MET engineers has created a whitepaper on how distances
are
> > calculated in MET.  Here is the link to the paper:
> > https://dtcenter.org/met/users/docs/write_ups/gc_simple.pdf
> > I hope this is helpful.  Please let us know you have any
additional
> > questions.
> >
> > Regards,
> > Minna
> >
> > ---------------
> > Minna Win
> > NCAR
> > Research Applications Lab
> > Phone: 303-497-8423
> > Fax:   302-497-8401
> >
> >
> > On Tue, May 29, 2018 at 6:33 PM, sim.aberson via RT
<met_help at ucar.edu>
> > wrote:
> >
> >>
> >> Tue May 29 12:33:03 2018: Request 85328 was acted upon.
> >> Transaction: Ticket created by sim.aberson at noaa.gov
> >>         Queue: met_help
> >>       Subject: distances in met-tc
> >>         Owner: Nobody
> >>    Requestors: sim.aberson at noaa.gov
> >>        Status: new
> >>   Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=85328
> >
> >>
> >>
> >> We have a verification program for TC tracks (and other
parameters) that
> >> is similar to met-tc with some additions.  We recently noticed
that it
> >> can't accurately calculate distances across Greenwich; if we
correct
> >> this problem, it can't accurately calculate distances across the
> >> dateline.  After testing with met-tc, it appears that the code
can
> >> calculate the distances properly.
> >>
> >> Can you provide the equations used to calculate distances in the
code,
> >> or, alternatively, the subroutine in which distances are
calculated?
> >>
> >> Thanks,
> >> Sim
> >>
> >>
> >
>
>
>

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