Using Bezier curves to draw flow lines

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 great circle lines don’t provide enough bend over...

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Reference lines for star plots aid interpretation

The other day I was reading Nathan Yau’s Visualize This, and in his chapter on visualizing multi-variate relationships, he brought up star plots (also referred to as radar charts by Wikipedia). Below is an example picture taken from a Michael Friendly conference paper in 1991. One of the things that came to mind when I...

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