If you've used a modern, interactive map such as Google or Bing Maps, you've consumed "map tiles". Map tiles are small images rendering a piece of the mosaic that is the whole map. Using conventional means, rendering tiles for the whole globe at multiple resolutions is a huge data processing effort. Even highly optimized, it spans a couple TBs and a few days of computation. Enter Hadoop. In this talk, I'll show you how to generate your own custom tiles using Hadoop. There will be pretty pictures.