They say you should never learn how the sausage gets made, but we're willing to make an exception for Google Maps. Talking to The Atlantic, Google has revealed just how much the human element figures into all that collected satellite imagery and road data. Many pieces of terrain information are tested and modified against what Google calls Ground Truth: actual driving, alternate sources and sign photos automatically extracted from Street View runs. Google isn't just making the occasional correction, either. Mapping a countr
