[ncl-talk] no value at the equator and additional line using gsn_add_polygon

[Alan Brammer]

ahh, There's actually a thickness to that line.

At the moment, your xp coord goes from  -90 : 90 then repeats -90 :90.
You want to flip the direction of the 2nd half of the array so rather than
start at 90S twice (and creating a discontinuity in the data halfway
through) it traces the +std line in 1 direction then smoothly traces the
-std line back to the origin.


Not tested!!

xp(:nlat-1)=lat
xp(nlat:(2*nlat-1))=lat(::-1)

yp(:nlat-1)=pr_lat(0,:)+allf_std
yp(nlat:(2*nlat-1))=pr_lat(0,::-1)-allf_std(::-1)



Good luck.




On Fri, Oct 13, 2017 at 2:25 PM, 刘振 <286909655 at qq.com> wrote:

> Hi -,
>
>   Thanks for your reply. But for the second question, if you look at the
> Figure 2 in detail, I want to shading the one standard deviation of the red
> line. But I want to delete the addition red line from the start point to
> end point. So the function gsn_add_polyline may not satisfy my requirement.
> Is there any other solutions? 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 <+86%20150%201324%206049>
> Liu  Zhen
> Department of Atmospheric Science
> School of Environmental Science and Engineering
> Sun Yat-sen University
> Email address: liuzhen9 at mail2.sysu.edu.cn
>
>
>
> ------------------ 原始邮件 ------------------
> *发件人:* "Alan Brammer";<abrammer at albany.edu>;
> *发送时间:* 2017年10月14日(星期六) 凌晨2:03
> *收件人:* "刘振"<286909655 at qq.com>;
> *抄送:* "ncl-talk"<ncl-talk at ucar.edu>;
> *主题:* Re: [ncl-talk] no value at the equator and additional line using
> gsn_add_polygon
>
> > why there is a white line over the equator? How to remove it?
> You mean Greenwich Meridian?
> https://www.ncl.ucar.edu/Document/Graphics/Resources/
> gsn.shtml#gsnAddCyclic
> You set this resource to false, therefore NCL did not bridge the gap.
>  Near the top of your res file:
> >   res at gsnAddCyclic          = False  ; data already has cyclic point
>
>
> >  For All_F in red shading line, why there is a addition red line connect
> from the beginning to the end. I found it seems to be a problem with
> gsn_add_polygon function I used.
>
> It's trying to draw a polygon (i.e. a closed shaped), the docs clearly
> state that if first and last points are not equal then the function will
> close the shape for you.  If you just want a line, then draw a polyline.
> https://www.ncl.ucar.edu/Document/Graphics/Interfaces/
> gsn_add_polyline.shtml
>
>
> > The third question is how can I add more space between legend labels
> vertically (i.e. All_F and Aero) in Figure 2?
> https://www.ncl.ucar.edu/Applications/legend.shtml
> Starting point is probably the resource pmLegendHeightF lots of examples
> of legend layout though.
>
>
> Documentation, the user guide and google for old ncl-talk emails will go a
> long way.
> https://www.ncl.ucar.edu/Document/
>
> Good luck,
>
>
>
>
> On Fri, Oct 13, 2017 at 1:13 PM, 刘振 <286909655 at qq.com> wrote:
>
>> Dear Sir/Madam:
>>
>>   Attached please find my script and figures. I got three questions about
>> the figures.
>>   Figure 1: why there is a white line over the equator? How to remove it?
>>   Figure 2: For All_F in red shading line, why there is a addition red
>> line connect from the beginning to the end. I found it seems to be a
>> problem with gsn_add_polygon function I used. How to remove this line?
>>   The third question is how can I add more space between legend labels
>> vertically (i.e. All_F and Aero) in Figure 2?
>>   Look forward to your replies. 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
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>> List instructions, subscriber options, unsubscribe:
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>>
>>
>
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