Re: trajectories crossing prime meridian

Hi Cathy,
I don't have any experience drawing trajectories, but I think you are
right about the 360->1 issue. I know you said you don't want to alter
your longitudes, and understandably so, but just to figure out what is
going on can you do a where statement to alter the longitudes within the
script to see if that fixes things?
lon = where(lon.eq.360,0,lon)

Let us know how that turns out. Perhaps someone else might have a
different/better suggestion...
Adam

On 10/03/2012 09:03 AM, Cathy Smith wrote:
> NCL users
> I am trying to plot trajectory paths using gsn_polyline on a polar
> stereographic projection ( gsn_csm_map_polar). The paths plot nicely
> except where they cross the prime meridian where they then plot a whole
> latitude circle before finishing correctly. I looked up the issue in the
> mailing list and saw that one should have pres@mpGreatCircleLinesOn=True
> in the code. I tried that and it didn't appear to do anything. (I have a
> sample image available if that isn't clear).
>
> I know the longitudes switch from 360 to 1 for the errant trajectories
> and I assume that is the issue. I'd like to avoid trying to change the
> longitudes as I would like the code to work for any trajectory and the
> code logic might be complicated. Is there an way to do this w/o changing
> longitudes?
>
> (I am using NCL v 6.0.0 on redhat linux.)
>
> Thanks for any advice.
>
> Cathy Smith
>

-- 
______________________________________________________________
Adam Phillips                                asphilli@ucar.edu
NCAR/Climate and Global Dynamics Division       (303) 497-1726
P.O. Box 3000				
Boulder, CO 80307-3000    http://www.cgd.ucar.edu/cas/asphilli
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