Click here to see the SAS code.
Click here to see the SAS code used to read in the data.
Click here to see the example.

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See my blog for more information!


Here's the original map from NOAA (note that their lines do not have anti-aliasing) .

http://www.spc.noaa.gov/gis/svrgis/images/tornado_tracks.png


Here's my SAS 9.3 version, with anti-aliased lines .

tornado_history.png (be sure to view full-size)

A few other improvements in my version:  In addition to the tornado paths 
(that have a beginning & ending coordinate), I also plot a single 'point' 
for the ones that just have a beginning coordinate (this fills-in a lot 
of points in Florida, for example).  Also, I make the state borders gray, 
rather than black, to de-emphasize them (because the red tornado data is 
the most important thing, and should stand out the most).  

I also used ods html to create the html overlay, with html mouse-over text, 
so you can hover and see the state names:

tornado_history.htm

And, you can scroll down to see each year plotted separately.  
(And the png file name has the year in it.)


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