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

[Alan Brammer]

> 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 <+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
>
>
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