Date: Tue, 25 Aug 2009 11:58:07 -0600
Hi Ed,
It is unlikely that you will always find an applications example that
exactly fits your needs. If example 10 is close to what you want, you
should start by modifying the graphical resources from that example.
I took coneff_10.ncl, added a gray colormap:
gsn_define_colormap(wks,"gsdtol")
told NCL to use different Fill Colors (or in this case, a different
color for each pattern)
res_at_cnMonoFillColor = False
altered the cnFillScales resource to keep the scaling the same for all
positve / all negative values:
res_at_cnFillScales = (/0.4,0.4,0.4 \ ; line density
, 1., 1., 1. \ ; default [no op]
,0.5,0.5,0.5,0.5,0.5/) ; stiple density
and set the cnFillColors resource:
res_at_cnFillColors = (/3,21,30,-1,-1,-1,30,26,21,15,3/)
The resulting image is attached.
Hopefully that is what you were looking for.
Adam
Yang Yang wrote:
> Hi Dennis:
>
> Thank you very much for letting me know the possible examples in NCL website.
>
> http://www.ncl.ucar.edu/Applications/coneff.shtml example 10 is close to what I want.
>
> However, it would be much better if the texture is the same for positive values or negative values, respectively, and the value levels are denoted by shading with darker shade for larger values.
>
> Ed
>
>
> --- On Tue, 8/25/09, Dennis Shea <shea_at_ucar.edu> wrote:
>
>> From: Dennis Shea <shea_at_ucar.edu>
>> Subject: Re: Black and white shadding plot for positive and negative values
>> To: "Yang Yang" <yang123yang_at_yahoo.com>
>> Date: Tuesday, August 25, 2009, 7:54 AM
>> The following WWW examples may satify
>> your needs.
>> If not, post again.
>>
>>
>> http://www.ncl.ucar.edu/Applications/coneff.shtml
>> Examples 3, 4, 5, 7, 10, 13
>>
>>
>> http://www.ncl.ucar.edu/Applications/height_lat.shtml
>> Example 3, 4, 5
>>
>>
>> http://www.ncl.ucar.edu/Applications/color.shtml
>> Example 14
>>
>>
>>
>> Yang Yang wrote:
>>> Hello:
>>>
>>> I want to plot field differences with both positive
>> and negative values with NCL. The color table such as
>> posneg_1 can easily show the values and looks excellent.
>> However, to save money for publication, I have to use black
>> and white shading.
>>> I want to use darker black shading to show larger
>> positive and negative values but with different texture so
>> that one can easily tell the negative or positive values
>>> I checked the color table of NCL but couldn't find the
>> one I want. I am wondering in the community if someone have
>> created a NCL script to plot the kind of black white shading
>> figure I described above? Can I share your script? Thanks!
>>> Ed
>>>
>>>
>>>
>>>
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>
>
>
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-- -------------------------------------------------------------- Adam Phillips asphilli_at_ucar.edu National Center for Atmospheric Research tel: (303) 497-1726 ESSL/CGD/CAS fax: (303) 497-1333 P.O. Box 3000 Boulder, CO 80307-3000 http://www.cgd.ucar.edu/cas/asphilli
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