[ncl-talk] gc_clkwise problem

[Mary Haley]

Dave,

I see you reported the other problem awhile back, and it hasn't been fixed,
so I modified the ticket to include your new email and we'll see if we can
get it fixed for 6.4.0.

We just fixed an issue with gc_latlon, so we might be able to piggy-back on
that knowledge to fix this one.

Thanks for the info,

--Mary


On Wed, Oct 26, 2016 at 8:11 PM, Dave Allured - NOAA Affiliate <
dave.allured at noaa.gov> wrote:

> NCL support,
>
> I am using NCL 6.3.0 on recent versions of both Mac OS and Linux.
>  gc_clkwise returns the wrong value for this simple clockwise polygon:
>
> ncl 1> lats=(/8,15,5,0/)
> ncl 2> lons=(/38,130,130,38/)
> ncl 3> print (gc_clkwise(lats,lons))
> (0) False
>
> However, the correct value is returned for the same polygon, with the
> order of coordinates simply rotated by one position:
>
> ncl 4> lats=(/0,8,15,5/)
> ncl 5> lons=(/38,38,130,130/)
> ncl 6> print (gc_clkwise(lats,lons))
> (0) True
>
> This may be related to a similar gc_clkwise problem that was assigned to JIRA
> NCL-1699.  Please add this case to that ticket.  Thank you.
>
> --Dave
>
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