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This post is intended to be a brief illustration of how one can utilize the edge element in SPSS's GGRAPH statements to produce vector flow fields. I post this because the last time I consulted the GGRAPH manual (which admittedly is probably a few versions olds) they only have examples of SPSS's...
As I talked about previously , great circle lines are an effective way to visualize flow lines , as the bending of the arcs creates displacement among over-plotted lines. A frequent question that comes up though (see an example on GIS.stackexchange and on the flowing data forums ) is that...