Re: How to plot wind exceeding 95% in bold arrows...?

Yes, something like that. You will first plot (aveX_u, aveX_v), then mask
out the
³un-significant² points:

aveX_u = mask(aveX_u, alpha_u.le.95.and.alpha_v.le.95,True)
aveX_v = mask(aveX_v, alpha_u.le.95.and.alpha_v.le.95,True)

(I never remember if this should be True or False, just try it...)

Then plot the new (aveX_u, aveX_v) with thick lines and overlay the two.

Examples of overlay (maybe example 6?) are available from:
http://ncl.ucar.edu/Applications/overlay.shtml

Andrea

-- 
Andrea N. Hahmann
Senior Scientist
Wind Energy Division
Risø DTU
Technical University of Denmark
Risø National Laboratory for Sustainable Energy
Frederikborgvej 399, P.O. Box 49
4000 Roskilde, Denmark
Direct +45 4677 5471
Mobil: +45 2133 0550
ahah@risoe.dtu.dk 
www.risoe.dtu.dk
From: "Sabeerali(sebi)" <sabeerl@gmail.com>
Date: Wed, 21 Apr 2010 18:17:38 +0530
To: "Andrea N. Hahmann" <ahah@risoe.dtu.dk>, <ncl-talk@ucar.edu>
Subject: Re: How to plot wind exceeding 95% in bold arrows...?
Thanks Hahmann. I want to bold the arrows if any of the component (u or v)
is significant.. So I used the following lines
sX=31
sY=1891
alpha_u = 100.*(1. - ttest(aveX_u, varX_u, sX,aveY_u,varY_u,sY,True,False))
alpha_v = 100.*(1. - ttest(aveX_v, varX_v, sX,aveY_v,varY_v,sY,True,False))
aveX_u=where(alpha_u.le.95.and.alpha_v.le.95,aveX_u@_FillValue,aveX_u)
aveX_v=where(alpha_u.le.95.and.alpha_v.le.95,aveX_v@_FillValue,aveX_v)
am I correct...?
And if I am correct how to overlay vector over vector as you told....Thanks
again...
On 21 April 2010 17:55, Andrea Hahmann <ahah@risoe.dtu.dk> wrote:
> Dear Sabeerali
> 
> One trick will be to overlay two plots.  A default with thin arrows for all
> winds, then delete the wind vector values that are not significant a re-plot
> the vectors with thick arrow lines. Finally, overlay the two plots.
> 
> Good luck,
> Andrea
> -- 
> 
> Andrea N. Hahmann
> Senior Scientist
> Wind Energy Division
> Risø DTU
> 
> Technical University of Denmark            
> Risø National Laboratory for Sustainable Energy
> Frederikborgvej 399, P.O. Box 49
> 4000 Roskilde, Denmark
> 
> Direct +45 4677 5471
> Mobil: +45 2133 0550
> ahah_at_risoe.dtu.dk <http://ahah@risoe.dtu.dk>
> www.risoe.dtu.dk <http://www.risoe.dtu.dk>
> 
> 
> 
> 
> From: "Sabeerali(sebi)" <sabeerl_at_gmail.com <http://sabeerl@gmail.com> >
> Date: Wed, 21 Apr 2010 17:17:58 +0530
> To: <ncl-talk_at_ucar.edu <http://ncl-talk@ucar.edu> >
> Subject: How to plot wind exceeding 95% in bold arrows...?
> 
> 
> I made the composite of wind vectors (for u and v components)..Also I have
> done the significance test by using ttest.(s1=31 and s2=1891) separately for u
> and v.Now I want to plot the composite in which the wind exceeding 95% are to
> be represent in bold arrows and winds which is not significant are to be
> represent in thin arrows..How I can do this in ncl ?
> 
> sX=31
> sY=1891
> 
> alpha_u = 100.*(1. - ttest(aveX_u, varX_u, sX,aveY_u,varY_u,sY,True,False))
> alpha_v = 100.*(1. - ttest(aveX_v, varX_v, sX,aveY_v,varY_v,sY,True,False))
> 
> Any help would be appreciated...
> Thanks in advance..
> 
> 
> -- 
> **********************************
> Sabeerali
> Climate and Global Modeling Division
> Indian Institute of Tropical Meteorology
> Pashan, Pune, 411 008
> ****************************************
> 
> 
> _______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
-- 
**********************************
Sabeerali
Climate and Global Modeling Division
Indian Institute of Tropical Meteorology
Pashan, Pune, 411 008
****************************************

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Wed Apr 21 07:04:49 2010