[Met_help] [rt.rap.ucar.edu #65367] History for MET-TC TK_ERR, MSLP_ERR?

[John Halley Gotway via RT]

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  Initial Request
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Hi ,
I have a cursory knowledge of tc_pairs and tc_stats now, and am moving 
on from the example in the tutorial.  In that example, track error is 
analyzed.  This is done by simply specifying the TK_ERR column.  Next I 
would like to the same thing with MSLP error.  Is there an equivalent 
way to do this?  I figured there would be a MSLP_ERR column, but 
couldn't find it. . .

Dave




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  Complete Ticket History
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Subject: Re: [rt.rap.ucar.edu #65367] MET-TC TK_ERR, MSLP_ERR?
From: John Halley Gotway
Time: Mon Feb 10 11:08:34 2014

Dave,

The .tcst files created by tc_pairs contain some "error" columns that
are computed by comparing the ADECK and BDECK track locations: TK_ERR,
ALTK_ERR, CRTK_ERR, X_ERR, and Y_ERR for track,
along-track, cross-track, east-west error, and north-south error.
Those types of errors are not trivial to compute, so tc_pairs does it
for you.

Other types of errors, like the difference of the mean sea level
pressures or differences in wind radii are trivial to compute.  If we
had included all possible differences in the .tcst output line
that would have made an already long output line even longer.
Instead, tc_stat supports the use of the minus sign and/or "ABS".

For example, try the following...
   -column AMSLP-BMSLP         # For the MSLP error
   -column ABS\(AMSLP-BMSLP\)  # For the absolute MSLP error
   -column ABS\(Y_ERR\)        # For the absolute value of the north-
south track error

If you're running this on the command line, you'll need to escape the
'(' and ')' characters.  If you use a config file, you shouldn't need
to.

So you can define arbitrary differences of the .tcst output columns
with/without absolute values.  Hope that helps clarify.

Thanks,
John

On 02/07/2014 03:18 PM, David Ahijevych via RT wrote:
>
> Fri Feb 07 15:18:55 2014: Request 65367 was acted upon.
> Transaction: Ticket created by ahijevyc
>         Queue: met_help
>       Subject: MET-TC TK_ERR, MSLP_ERR?
>         Owner: Nobody
>    Requestors: ahijevyc at ucar.edu
>        Status: new
>   Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=65367 >
>
>
> Hi ,
> I have a cursory knowledge of tc_pairs and tc_stats now, and am
moving
> on from the example in the tutorial.  In that example, track error
is
> analyzed.  This is done by simply specifying the TK_ERR column.
Next I
> would like to the same thing with MSLP error.  Is there an
equivalent
> way to do this?  I figured there would be a MSLP_ERR column, but
> couldn't find it. . .
>
> Dave
>
>

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Subject: Re: [rt.rap.ucar.edu #65367] MET-TC TK_ERR, MSLP_ERR?
From: David Ahijevych
Time: Mon Feb 10 13:23:26 2014

I think this is exactly what I was looking for - thanks for taking the
time to answer this!


On 2/10/14 11:08 AM, John Halley Gotway via RT wrote:
> Dave,
>
> The .tcst files created by tc_pairs contain some "error" columns
that are computed by comparing the ADECK and BDECK track locations:
TK_ERR, ALTK_ERR, CRTK_ERR, X_ERR, and Y_ERR for track,
> along-track, cross-track, east-west error, and north-south error.
Those types of errors are not trivial to compute, so tc_pairs does it
for you.
>
> Other types of errors, like the difference of the mean sea level
pressures or differences in wind radii are trivial to compute.  If we
had included all possible differences in the .tcst output line
> that would have made an already long output line even longer.
Instead, tc_stat supports the use of the minus sign and/or "ABS".
>
> For example, try the following...
>     -column AMSLP-BMSLP         # For the MSLP error
>     -column ABS\(AMSLP-BMSLP\)  # For the absolute MSLP error
>     -column ABS\(Y_ERR\)        # For the absolute value of the
north-south track error
>
> If you're running this on the command line, you'll need to escape
the '(' and ')' characters.  If you use a config file, you shouldn't
need to.
>
> So you can define arbitrary differences of the .tcst output columns
with/without absolute values.  Hope that helps clarify.
>
> Thanks,
> John
>
> On 02/07/2014 03:18 PM, David Ahijevych via RT wrote:
>> Fri Feb 07 15:18:55 2014: Request 65367 was acted upon.
>> Transaction: Ticket created by ahijevyc
>>          Queue: met_help
>>        Subject: MET-TC TK_ERR, MSLP_ERR?
>>          Owner: Nobody
>>     Requestors: ahijevyc at ucar.edu
>>         Status: new
>>    Ticket <URL:
https://rt.rap.ucar.edu/rt/Ticket/Display.html?id=65367 >
>>
>>
>> Hi ,
>> I have a cursory knowledge of tc_pairs and tc_stats now, and am
moving
>> on from the example in the tutorial.  In that example, track error
is
>> analyzed.  This is done by simply specifying the TK_ERR column.
Next I
>> would like to the same thing with MSLP error.  Is there an
equivalent
>> way to do this?  I figured there would be a MSLP_ERR column, but
>> couldn't find it. . .
>>
>> Dave
>>
>>


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