When we examined all the leftover spaces in San Francisco, New York, New Orleans, Minneapolis — we found the same thing to be true in every city,” de Monchaux says. “You had a whole archipelago of city-owned lots lying fallow. In New York they add up to the size of Central Park and Prospect Park together. It’s a massive untapped resource that’s impossible to visualize without these contemporary tools.

Space: It’s Still a Frontier - Opinionator Blog - NYTimes.com