If you poke around a little on the internet you'll find that the photos people post on sites like Flickr are often cluster around some very busy, very popular spots. Sure there are lots of photos of the Statue of Liberty, but there are also plenty of pictures of storefronts on Fifth Avenue and only a few of W 158th. Rather than map out the points, like Flickr, Eric Fischer decided to map the streets. Naturally, he posted his maps on Flickr.
h/t Cindy C