[gradsusr] Locating saddle points from stream line charts

[Frank Colby]

Hi Lyndz,

In case you haven't received a reply, this is what I have used.  You 
click the mouse on the location, and the lat and lon come back.

Good luck!
Frank

     say 'click to locate center'
     'q bpos'
     x = subwrd(result,3)
     y = subwrd(result,4)
     'query xy2w 'x' 'y
     xlat = subwrd(result,6)
     ylon = subwrd(result,3)
     say xlat ' 'ylon
*   now we have the lat and lon of the cursor


On 5/22/2019 2:30 PM, Lyndz wrote:
> Dear Grads experts,
>
> I would like to ask if there is a way to locate (lat-lon coordinates) 
> saddle points/col/equilibrium points in GrADS from streamline charts.
>
> Attached is the sample image regarding this. The black dot is the 
> location of the saddle point that I want to locate. It is where two 
> highs and two lows that are juxtaposed in a northwest-southeast and 
> northeast-southwest orientations, respectively, meet.
> *_
> _*
> I'll appreciate any help.
>
> Sincerely,
> *_
> _*
> *_Lyndz_*
>
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