Wikipedia writes about Stephen Wiltshire:
Wiltshire can look at a subject once and then draw an accurate and detailed picture of it. He frequently draws entire cities from memory, based on single, brief helicopter rides. For example, he produced a detailed drawing of four square miles of London after a single helicopter ride above that city. His nineteen-foot-long drawing of 305 square miles of New York City is based on a single twenty-minute helicopter ride.
Is it true that he made those painting only based on information from those helicopter rides and that those paintings are accurate?