In the following survey, Google Earth's aerial photography of Baltimore city was scanned in its entirety. Noted were distinct instances in which vacant space has been utilized as a more efficient pedestrian route, as indicated by a diagonal path worn in the lot's grass. Using Google Earth's measuring tool, the length of the city sanctioned route (as determined by streets and sidewalks) between the points defined by the crow-line route, was established.

The length of the crow-line route was subtracted from the length city sanctioned route.