[gradsusr] maksout wind barbs regarding wind direction

[Andrew Friedman]

Hi Rabah,

Could you use the arc-cosine function applied to the ratio of zonal to meridional wind to determine the angle?
http://www.iges.org/grads/gadoc/gradfuncacos.html

Andrew

On Jul 16, 2014, at 3:50 PM, Rabah Hachelaf <r.hachelaf at gmail.com> wrote:

> Thanks Andrew,
> 
> Yes i see this function but i don't know how i can use it because we don't know the units of wind direction (degree or radian) and if it is meteorological or mathematical direction.
> 
> 
> 
> 
> 2014-07-16 18:35 GMT-04:00 Andrew Friedman <andfried at berkeley.edu>:
> Hi Rabah,
> 
> You should be able to mask the wind vectors between certain values using the maskout function: http://www.iges.org/grads/gadoc/gradfuncmaskout.html
> 
> Andrew
> 
> On Jul 16, 2014, at 3:22 PM, Rabah Hachelaf <r.hachelaf at gmail.com> wrote:
> 
> > Hi all,
> >
> > I want to display only wind barbs which have direction between 40 deg and 50 deg (NE direction).
> >
> > Any suggestions.
> >
> > Thank you
> >
> > --
> > ------------------------------
> > Cordialement,
> > Best regards,
> > Rabah Hachelaf
> >
> >
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> 
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> 
> -- 
> ------------------------------
> Cordialement,
> Best regards,
> Rabah Hachelaf 
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