[gradsusr] wave model plotting

[Eric Altshuler]

The choice of which trigonometric function to use for which component, and whether a minus sign is required for one or both components, depends on the convention used for the wave direction. Is north equivalent to 0 degrees? Whatever convention is used, if you believe the vectors are pointing in the opposite direction, just put a minus sign in front of both components:

'd -sin(dirpwsfc*3.14159/180);-cos(dirpwsfc*3.14159/180)' 

Best regards,

Eric L. Altshuler
Assistant Research Scientist
Center for Ocean-Land-Atmosphere Studies
4041 Powder Mill Road, Suite 302
Calverton, MD 20705-3106
USA

E-mail: ela at cola.iges.org
Phone: (301) 902-1257
Fax: (301) 595-9793

----- Original Message -----
From: "bala vasanthakumar" <bala_vasanthakumar at rediffmail.com>
To: "GrADS Users" <gradsusr at gradsusr.org>
Sent: Tuesday, June 7, 2011 3:18:58 AM
Subject: [gradsusr] wave model plotting


Hi all 
can any one help me out regarding plotting of wave model through grads. 
as i am plotting wave direction and speed, through grads, and the problem is the arrow which is plotting was 180 deg opposite. can any one kindly help me out regarding how to plot the arrows towards the direction. 


'd sin(dirpwsfc*3.14159/180);cos(dirpwsfc*3.14159/180)' 
the above said display i am using to plot the direction of the wave 


thanking u 


P Balavasanthakumar 
Sr. Manager 
SDS 
Bangalore 



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