Isogon
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In meteorology, an isogon is a line of equal or constant wind direction on a graph, plot, or map; an isopleth of wind direction.
External link
- Drawing Contour Plots (http://avc.comm.nsdlib.org/cgi-bin/wiki_print.pl?Drawing_Contour_Plots). A lesson plan that deals with drawing various isopleths including isogons.