Re: position of the value 0 in cnLevels to be represented by white colour.

Maybe "gsn_contour_shade" is what you're looking for:

http://www.ncl.ucar.edu/Document/Graphics/Interfaces/gsn_contour_shade.shtml

--Mary

On Mar 8, 2011, at 5:47 AM, gibies george wrote:

> How can I get the position of the value 0 in cnLevels while setting the resources for contour plot ?
>
> My requirement is as follows.
>
> I would like to get white to represent the value near to zero in contour interval irrespective of the data range.
> ---------
> ----------
> -----------
>
> gsn_define_colormap(wkspnl,"ViBlGrWhYeOrRe")
> white = 52
> data_min = min(data)
> data_max = max(data)
>
> if (data_min .gt. 0)
> resc@gsnSpreadColorStart = white
> resc@cnLevelSelectionMode = "ManualLevels"
> resc@cnMinLevelValF = 0
> end if
>
> if (data_max .lt. 0)
> resc@gsnSpreadColorEnd = white
> resc@cnLevelSelectionMode = "ManualLevels"
> resc@cnMaxLevelValF = 0
> end if
>
> if ((data_min .lt. 0) .and. (data_max .gt. 0))
> ----------
> ???????
> ----------
> end if
> ----------------------
> -----------------------
> ----------------------
>
> How can I implement this?
>
>
> --
> Gibies George, CSIR-RF,
> Seasonal Scale Prediction Group,
> Climate and Global Modelling Division,
> Indian Institute of Tropical Meteorology,
> Dr. Homi Bhabha Road,
> NCL (P. O.), Pashan,
> Pune 411008, India.
>
> http://sites.google.com/site/gibiesge/
>
> Please Think about the environment. Save paper; Save Trees; and don't print this e-mail unless it is necessary.
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Received on Tue Mar 8 15:27:44 2011