Well according to WIRED, that is….
At Google’s Cloud Next conference in March 2017, Narula unveiled an even bigger project: a working mock-up of the city of Cambridge, with 130,000 virtual inhabitants. It included simulations of the traffic and public-transport networks, utilities, power lines and mobile-phone and internet systems. Narula claims the Cambridge simulation is “the largest of its kind ever created”.
“They solved a really difficult technical problem,” says Nan Boden, head of global partnerships at Google Cloud. “The first time I saw it, I said, ‘Wow, that’s some really nice computer science work there.’”
From an earlier article it looks like the guts are SpatialIOS a framework to, amoung other things, compose large scale simulations from multiple other simulations.
Spatial OS will allow developers to combine existing simulation models. An SDK is available now; the platform will also integrate with real-time data, as well as popular game engines such as Unity. “There are people with models of traffic, models of pedestrians, models of pollution, models of viral spread, who have limited views on one area, but have no means to create true worlds that explore the answers to these questions,” says Narula. “We’ll give you a world in a bottle that you can use to ask questions of the real world.”
Some of the descriptions sound familiar.