Re: Help: gsn_panel and wind barbs

Hi Hassan,

You're right, you can't use the wmxxx functions with gsn_panel,
because as you saw, the wind barbs are not actually associated with
the plot. When the plot is resized and redrawn in gsn_panel, then, the
wind barbs disappear.

I think your best bet is to not use gsn_panel, but rather use the
vpXF, vpYF, vpWidthF, and vpHeightF resources to position each
individual plot yourself, and as you draw each plot, to call wmbarb
and/or wmbarbmap to draw the wind barbs on each one.

I've attached a modification of example 3 from the page:

   http://www.ncl.ucar.edu/Applications/weather_sym.shtml

and duplicated it four times to show how to panel these plots. I will
ask Fred Clare, our weather map expert, if he can make this series of
plots slightly more interesting for paneling, and then I'll add it as
example 5 on the same page.

Good luck,

--Mary

On Wed, 4 Jul 2007, Hassan Gilani wrote:

> Hi all,
>
> I am trying to plot wind barbs at different locations on the map and want to
> plot multiple maps (with windbarbs) on same window (gsn_panel).
>
> Now the problem is that the two windbarb functions, wmbarb and wmbarbmap,
> only require WKS reference and if understand it correctly the function
> assumes that the workspace window has only one map (meaning I cant use this
> function since i am plotting multiple maps on the same window).
> And even if by some way I am able to plot multiple maps with windbarbs,
> using gsn_panel() command makes all barbs dissappear. I tried this by
> plotting windbarbs on only one map and plotted it using
> gsn_panel()function. It plots the map but doesnt plot the windbarb.
>
> Now the other way i found was using gsn_vector_map(), and setting its vcGl..
> resource to "Windbarb". But this method doesnt solves the problem for me.
> First I am not clear about how the vector fields are set and which part of U
> & V has the latitude, longitude, direction and speed values. Second, I am
> not sure if I can plot windbarbs at different locations using this method. I
> think this method is more suitable for plotting wave of wind with different
> magnitudes (but still i dont know how to set the different fields of U and
> V)
>
> I have attached sample images, that show what I am required to plot (images
> a a bit blurr). Can any one suggest me a way that can help me achieve this.
>
> Thankx in advance for ur time and reply.
>
> Hassan.
>

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