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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