Re: [idvusers] Threshold for closed circle in station model?

• To: <chastang@xxxxxxxx>, <idvusers@xxxxxxxxxxxxxxxx>
• Subject: Re: [idvusers] Threshold for closed circle in station model?
• From: "Herbster, Christopher G." <herbstec@xxxxxxxx>
• Date: Tue, 16 Apr 2013 18:54:00 -0400

Julien, 

So would "10" be >=7.5 and < 12.5 and then >=12.5 and < 17.5 for "15"?
I guess the question is, "which edge gets the "=" sign for inclusion in the 
binning?"  I assume the break points are included on one edge. (There I go 
again, making more assumptions! )

Thanks for your help, 

Chris Herbster


Sent via the Samsung Galaxy S™III, an AT&T 4G LTE smartphone with tiny keys and 
a strong desire to substitute, sometimes humorous, words into messages.

-------- Original message --------
From: Julien Chastang <chastang@xxxxxxxx> 
Date:  
To: idvusers@xxxxxxxxxxxxxxxx 
Subject: Re: [idvusers] Threshold for closed circle in station model? 
 
Professor Herbster,

We've been burned ourselves :-)

My notes say:

- a circle for calm winds (0 speed)
- a shaft with no barbs<= 2.5 knots
- a shaft with a half barb for > 2.5 and< 7.5 knots

Please let us know if you have further questions.

Best Wishes,

Unidata IDV Support


On 4/16/13 3:02 PM, Chris Herbster wrote:
> Hi folks,
>
> Before I attempt to look through code that I don't know (in a language 
> I can barely read), can anyone help with a definitive answer to the 
> thresholds used to draw a "calm" circle around a station, a shaft with 
> no barbs, and then the 5 knot increment for the barbs?  (I assume that 
> a "short barb" for "5 kts" is drawn is speed is >2.5 kts and <= 7.5, 
> but I have gotten burned by an assumption more than once in the past!)
>
> As always, any help is welcome!
>
> Thanks,
> Chris Herbster
>

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