[ncl-talk] Fwd: Pennants wind barbs thickness

Rabah Hachelaf hachelaf at sca.uqam.ca
Thu Jul 24 12:50:46 MDT 2014

Hi David,

Yes i re-post my question maybe some one from NCL users has an other idea.


2014-07-24 14:11 GMT-04:00 David Brown <dbrown at ucar.edu>:

> Hi Rabah,
> As you know I previously answered this question for you personally prior
> to your joining ncl-talk. For the record I am now answering on ncl-talk:
> You have diagnosed the problem correctly, and unfortunately there is no
> resource to directly control the size of the pennant part of the wind barb
> glyphs. The size and area of the pennants is fully determined by
> the vcWindBarbTickLengthF and the vcWindBarbTickAngleF. Unfortunately there
> is currently no adjustment made to account for the width of the lines,
> which also has the effect of making the barbs longer than their nominal
> length. No one has ever asked for this kind of flexibility in the past, but
> I can see that it could be useful.
> You could try playing with the tick length and tick angle resources. They
> may help give you a combination that looks better. But until we can add
> another option, my suggestion would be to just try to keep the width as
> small as feasible for your purposes.
>  -dave
> On Tue, Jul 22, 2014 at 4:54 PM, Rabah Hachelaf <hachelaf at sca.uqam.ca>
> wrote:
>> Hi NCL users,
>> I have problem with plotting wind barb with a relatively big thickness
>> I am using vcWindBarbLineThicknessF command to increase wind barb
>> thickness
>> it's correct for all wind barbs only for higher than 50KT ones where the
>> pennants or small triangle aren't affected by the thickness set.
>> When reading some documentation i noted that
>>   " The pennants are drawn using a filled polygon, while the ticks, the
>> shaft, and the calm circle are all rendered with polylines."
>> So i think this is why pennants aren't affected by the thickness change.
>> Have you some tricks to solve this problem and get the same pennants
>> thickness like the ticks.
>> Attached you can find an example of my case, where wind speed is supposed
>> to be about between 55KT and 60KT
>> Thank you.
>> ------------------------------
>> Cordialement,
>> Best regards,
>> Rabah Hachelaf
>> Msc Studient UQAM
>> Montréal/CANADA
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Best regards,
Rabah Hachelaf
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