vector display on polar stereo grid

[Mac MacLeod]

Hi John

Within a North Polar Sterographic display use this in the script to get wind barbs 

*  Set colour of barbs to blue
'set ccolor 11' 

* Set output for wind barbs

'set gxout barb'

'd skip(u,6,6);v' 

'set gxout contour'


the skip function permits you to thin the barbs.


If you want real vectors then use this section

If you have the true north wind direction as a number and you want to create a vector use this:

'set gxout vector'

'set arrscl 0.5 2 ' 

'set arrowhead 0.1 '

'display skip(-1*1*sin(psd*3.1414/180),4,4) ; -1*1*cos(psd*3.1414/180) '

'set gxout contour'

Where psd is the direction to 360 degrees of the compass.  Again skip with the ,4,4 thins the display (show every 4th row and 4th column of vectors.



I hope this helps.



Sincerely



Mac



M.A.(Mac) MacLeod 
President and General Manager,
Scotia Weather Services Inc.
192 Wyse Road, Suite 8,
Dartmouth, Nova Scotia, B3A 1M9
Tele: 902-468-3866 
Cell: 902-225-5747
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E-mail: mmacleod at scotiaweather.com
visit us at: www.scotiaweather.com


 



----- Original Message ----- 
From: "John Papineau" <John.Papineau at NOAA.GOV>
To: <GRADSUSR at LIST.CINECA.IT>
Sent: Tuesday, December 05, 2006 17:37 PM
Subject: vector display on polar stereo grid


> Grads Folks-
>    What do I need to do in order to display winds (vectors) within
> a north polar stereo projection.  Do I need to covert or doing something
> with the pdef  line within the .ctl file??
> 
> Many Thanks-John
>
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