Re: Draw contour lines with a specific value (not only negative or positive) as dashed, thanks!

Hi Xiaoming,
If you want to specify that a single contour line be colored a specific
color, then you could use the following code:
gsn_define_colormap(wks,"Cat12")
res@cnLevelSelectionMode = "ExplicitLevels"
res@cnLevels = ispan(960,1030,10)
res@cnMonoLineColor = False
res@cnLineColors = (/1,1,1,9,1,1,1,1/) ; set to color indices of
                                          ; Cat12 colormap

alternatively, if you have many contour levels, and you want to specify
named colors:
arr = new(dimsizes(cnLevels),"string")
arr = "black"
arr(3) = "red"
res@cnLineColors = arr

Hope that helps,
Adam

On 01/10/2011 12:11 PM, Xiaoming Sun wrote:
>
> Dear All,
>
> Does anybody know how to draw contour lines with a specific value (not only
> negative or positive), for example the contour line with a value of 990, in
> different color with the rest of the other contour lines?
>
> Thanks a lot?
>
> Best Regards,
>
> Xiaoming
>
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Adam Phillips 
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National Center for Atmospheric Research   tel: (303) 497-1726
Climate and Global Dynamics Division         fax: (303) 497-1333
P.O. Box 3000				
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