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Columbus’s fateful voyage was inspired by his study of a map by Paolo Toscanelli. But there was also the 1854 cholera outbreak in London, which killed hundreds of people until a physician, John Snow, drew a map demonstrating that a single contaminated water pump was the source of the illness, thereby founding the science of epidemiology. There was the 1944 invasion at Normandy, which succeeded only because of the unheralded contribution of mapmakers who had stolen across the English Channel by night for months before D-Day and mapped the French beaches.* Even the moon landing was a product of mapping. In 1961, the United States Geological Survey founded a Branch of Astrogeology, which spent a decade painstakingly assembling moon maps to plan the Apollo missions. The Apollo 11 crew pored over pouches of those maps as their capsule approached the lunar surface, much as Columbus did during his voyage. It seems that the greatest achievements in human history have all been made possible by the science of cartography.
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