Re: multiple overlays

Hi Joe,

I don't know what the upper limit is on the number of overlays, but
you can certainly do at least three.

The key is that you need to set up a base plot, which is usually a map
(that can already have contours or vectors overlaid on it). Then, as
long as the data that you want to contour and vectororize for the rest
of the plots have latitutde/longitude coordinate information included,
you can overlay these on the base plot.

A crude example:

; All data must have lat/lon coordinate arrays
   contour_plot1 = gsn_csm_contour(wks,data1,cnres1)
   contour_plot2 = gsn_csm_contour(wks,data2,cnres2)
   vector_plot = gsn_csm_vector(wks,u1,v1,vcres)
   map_plot = gsn_csm_map(wks,mpres)

   overlay(map_plot,contour_plot1)
   overlay(map_plot,contour_plot2)
   overlay(map_plot,vector_plot2)

   draw(map_plot)
   frame(wks)

For a complete example, please see example 3 on the new TIGGE
applications page that Adam created:

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

This particular example is overlaying several contour plots,
but the same principle can be applied for vector plots.

--Mary

On Wed, 11 Jul 2007, Joe Metzger wrote:

> I've searched the website and archives for this capability and may have
> missed it, but I'm wondering if NCL can plot *three* overlays? I want a
> color-filled plot on the bottom, then line contours on top of that, and
> finally curly vectors on the very top. Is this possible? Thanks for any
> advice or sample scripts.
>
> Joe
>
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>
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Received on Wed Jul 11 2007 - 09:52:14 MDT