I was not aware that Batman’s Gotham City has had a consistent map for the last fifteen years or so. Its geography was defined in 1998 by illustrator Eliot R. Brown for the “No Man’s Land” storyline but has been used ever since, including by the Christopher Nolan trilogy of movies. Brown describes how the map came to be on his website; the story has also been picked up by Smithsonian.com. Thanks to Caitlin and Dwight for the tip.