There's a higher level of photographic memory that very few people are capable of. Those that can call on demand images of the past at will. I've met one, and knew of a teacher who knew one. Like the author of this article stated. It can be a curse, nightmares and things they don't want to remember stick with them. Forever.

Although a lot of people also have really great memory, which can arguably said to be "somewhat photographic" as the author said. In which case, I do as well. I cannot agree that being able to walk through a previous scene with a bird's eye view is part of being photographic memory though. I think that as just powerful spatial visualization combined with good memory.