[ncl-talk] Significance with contour: positive in solid line and negative in dash line

[Mary Haley]

Dear Zhen,

One way to find out if there's an example for something specific you are
trying to do, you can use the "tips" link on the examples page:

List of tips <http://www.ncl.ucar.edu/Applications/concepts_list.shtml>,
resources <http://www.ncl.ucar.edu/Applications/res_list.shtml>,
functions/procedures <http://www.ncl.ucar.edu/Applications/func_list.shtml> and
the example scripts they appear in.


Which takes you to this page:

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

You can then use your browser search to search for "negative" or
"positive".  You will find this under the search for "negative":

*Drawing negative contour lines as dashed lines*
    conOncon_1.ncl
<http://www.ncl.ucar.edu/Applications/Scripts/conOncon_1.ncl> (contours on
contours <http://www.ncl.ucar.edu/Applications/conOncon.shtml#ex1>)
    conOncon_2.ncl
<http://www.ncl.ucar.edu/Applications/Scripts/conOncon_2.ncl> (contours on
contours <http://www.ncl.ucar.edu/Applications/conOncon.shtml#ex2>)
    conOncon_4.ncl
<http://www.ncl.ucar.edu/Applications/Scripts/conOncon_4.ncl> (contours on
contours <http://www.ncl.ucar.edu/Applications/conOncon.shtml#ex4>)
    coneff_3.ncl <http://www.ncl.ucar.edu/Applications/Scripts/coneff_3.ncl>
 (contour effects <http://www.ncl.ucar.edu/Applications/coneff.shtml#ex3>)
    coneff_5.ncl <http://www.ncl.ucar.edu/Applications/Scripts/coneff_5.ncl>
 (contour effects <http://www.ncl.ucar.edu/Applications/coneff.shtml#ex5>)
    coneff_6.ncl <http://www.ncl.ucar.edu/Applications/Scripts/coneff_6.ncl>
 (contour effects <http://www.ncl.ucar.edu/Applications/coneff.shtml#ex6>)
    coneff_9.ncl <http://www.ncl.ucar.edu/Applications/Scripts/coneff_9.ncl>
 (contour effects <http://www.ncl.ucar.edu/Applications/coneff.shtml#ex9>)


I recommend clicking on the link inside the "(...)" and not the actual NCL
script, because this way you can see the description of the example, the
image, and the link to the script. A good example to start with is
"coneff_3.ncl":

http://www.ncl.ucar.edu/Applications/coneff.shtml#ex3

which mentions two resources, gsnContourNegLineDashPattern and
gsnContourPosLineDashPattern

http://www.ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnContourNegLineDashPattern
http://www.ncl.ucar.edu/Document/Graphics/Resources/gsn.shtml#gsnContourPosLineDashPattern

which should hopefully answer your first question.

To answer your second question, you can also use the "tips" page, but this
time search for "dot" or "stipple". In this case, "dot" gives you the best
results, and "coneff_11.ncl" may be the best example to look into.  The
resources cnFillScaleF and cnFillDotSizeF may help you with the density and
size of your dots.

http://www.ncl.ucar.edu/Applications/coneff.shtml#ex
<http://www.ncl.ucar.edu/Applications/coneff.shtml#ex11>11

If this doesn't help, please post back to ncl-talk.

Thanks,

--Mary


On Thu, Aug 16, 2018 at 8:02 AM, 刘振 <286909655 at qq.com> wrote:

> Dear Sir/Madam,
>
>   I use the script attached to plot the significance area (student's t
> test) with contour lines. I am wondering if there is a way to make the
> positive area (shading) in solid line while negative area in dash line. The
> output is also attached. Thanks.
>   For another output named T2-CTLF-CTL-sum.pdf, most of the area are at
> 95% significant. By contrast, only region not significant show with
> contours. Could you also tell me how to deal with such kind of situation. I
> try to use dot instead of contour to show significant area. But all the
> plot become black because of the data at a high resolution. Here comes the
> question that how to decrease the density of the dots? Thanks.
>
> Best regards,
> zhen
>
> ------------------
> 刘振
> 中山大学
> 环境科学与工程学院
> 大气科学系
> Phone: +86-15013246049
> Liu  Zhen
> Department of Atmospheric Science
> School of Environmental Science and Engineering
> Sun Yat-sen University
> Email address: liuzhen9 at mail2.sysu.edu.cn
>
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20180816/86b56308/attachment.html>