Click here to see the SAS code.
Click here to see the example.

I did this custom/annotate chart because "proc gradar" wouldn't quite
do this kind (not even the windrose chart).  

First I annotate 4 pie slices for the 4 quadrants of the pie.
Then I annotate 'empty' pies to do the circles inside the larger pie.

The 'spokes' represent how many flights went in that compass direction.
I created them using annotate 'move/draw' lines, with a very thick
width (ie, size).

One limitation is that annotated lines do not allow charttips or
drilldown.  As a workaround, you could annotate a pie/dot at the
end of each line segment, and use the dot for the charttip and drilldown.

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