plotting trajectories

To: ferret_users@xxxxxxxxxxxxxxxxxxx
Subject: plotting trajectories
From: Michael Traub <mtraub@xxxxxxxxxxxxxxxxx>
Date: Wed, 20 Aug 2003 16:22:39 +0200
Sender: owner-ferret_users@xxxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; U; Linux i686; de-DE; rv:1.0.1) Gecko/20020823Netscape/7.0

Hi!

I would like to plot air parcel trajectories overlaying a world map.
The positions of of each parcel is given by its longitude and latitude. It is no problem to plot all positions, but it is a problem to combine the positions with a line:

If
lon_1 = 340° lat_1 = 24°
lon_2 = 12° lat_2 = 24°

ferret plots a line in x-direction from 340° to 12° from EAST to WEST!!! HOW TO MAKE FERRET PLOTTING LINES FROM WEST TO EAST CROSSING 0°????
Does somebody has an idea?

Michael

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