Here is a small multiple showing the 12 busiest airports by passenger traffic.   Many thanks to Dylan Moriarty who helped me navigate the tantalizing, but somewhat intimidating, world of OpenStreetMap extracts. And thanks to Ken Field and Wes Jones for their graphical advice. I am surprised at the remarkable variation in scale (Hong Kong??) … Continue reading Airdrome

Tree Ring Symbology

Tree Ring Symbology uses a series of ring symbols, chronologically increasing in size like the growth rings of a tree. Color and/or thickness then encode some data variable. This map uses a variant, where instead of scaling the rings chronologically, like a tree, they are scaled by local aggregated tornado intensity, while the colors indicate … Continue reading Tree Ring Symbology

Tornado Migration

Here is a map of the seasonal migration that tornadoes take. Tornado migrations can be mapped like birds or wildebeests or commuters. Like just about everything else on this amazing planet of ours, they have a seasonal circuit and an ebb and flow. I live in Michigan, where I’m coming out of another winter. Believe … Continue reading Tornado Migration