[ncl-talk] Issue with gsn_add_polyline

[Andy]

Hi,
I am using NCL version 6.3.0. I am trying to use gsn_add_polyline to 
draw on a stereo-polar map (similar to the points added in example 
scatter_6.ncl). I attached a script that is hopefully showing the 
problem I am dealing with. Plot 1 (on the left) shows the data I 
originally wanted to plot. Unfortunately, the 5th and 6th point 
(counting from the NP to lower latitudes) are not connected on the 
shortest path. I then changed the value for the 6th point from 359 to 1 
degrees, which resulted in plot 2. Thinking that gsn_add_polyline 
couldn't handle points on either side of 0/360, I made up data that with 
points alternating from 320-350 and 20-50. The resulting plot 3 does not 
show the same issue as plot 1. Can someone explain to me when 
gsn_add_polyline will connect points through 0 or what I am doing wrong 
here?
Thanks,
Andy

-- 
Andy Miller
MIT PAOC PhD Candidate

77 Massachusetts Ave | 54-1715
Cambridge, MA 02139

Phone: 617-253-3715
Email: awmiller at mit.edu

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