Martin Ceperley’s Old Map App for the iPhone isn’t available yet but it looks really interesting.
Old Map App allows an iPhone user to explore the effects of time on geography and urban development.
The application displays layers of geo-referenced historical maps projected onto a modern coordinate system, so that the same location can be compared over time. Layers can be faded, adjusted, and explored freely. If the user is located with the region of the historical map, the user’s position will be mapped on the old maps to the position of the compass indicator.
Several maps of New York City & Region are included from the 18th, 19th, and 20th centuries. All are high-resolution scans from the Library of Congress.
Usually when we think of augmented reality, it’s the current point in time being augmented. This situation is similar except the augmentation takes you back a few centuries. Great idea.