Inside the Secret Program to Build the World's Best Maps

Alexis Madrigal's article "Inside the Secret Program to Build the World's Best Maps" offers a look into how how Google puts its maps together using "Ground Truth."  The Library has many people using Google Map and Google Earth to look things up, but most have little idea how the various data elements are put together.  For anyone who wants to know more about the way things work, this is cool stuff.