Re: overlay contour (netto)

Hallo NCL,

Thanks for the idea, However I just wonder
1. how can I possibly change the color, for instance from black to be
*SlateBlue"?
and
2. is it possible to overlay this netto contour with another contour line?

Thank you

On Fri, Jul 26, 2013 at 1:15 AM, Mary Haley <haley@ucar.edu> wrote:

> Xi,
>
> See the attached example and image. Is this what you need? I draw the
> contour lines in different colors so you could see them in the final
> overlay plot.
>
> What I did was to set cnFillColors for both plots, using RGBA quadruplets.
> This allows me to set the transparency levels for each color.
>
> For the first plot, I made both contour fill colors (black and white)
> fully opaque (non-transparent).
>
> For the second plot, I made black fully opaque, and white fully
> transparent.This way, when you overlay, you will only see white if both
> contour areas are white in the same locations.
>
> --Mary
>
>
> On Jul 24, 2013, at 3:24 AM, Xi Chang wrote:
>
> >
> > Hallo NCL,
> >
> > I have a question, how can i possibly create such an overlay contour
> from two different fields, let's say:
> >
> > X (contour: negative value= black, positive value= white)
> > Y (contour: negative value= black, positive value= white)
> >
> > then do an "OVERLAY X slice Y". The result of overlay product from two
> contour map will be:
> >
> > if negative values + negative values == Black
> > if positive + negative == Black
> > if negative + positive == Black
> > if positive + positive === "WHITE"
> >
> > X slice Y.
> >
> > I really appreciate for your hints.
> >
> > Xi
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>
>

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Received on Fri Aug 9 13:02:23 2013