3D data creation is part of a growing trend in the use of computational imaging techniques within cultural heritage digitization shops. In particular, operational adoption of photogrammetry has been witnessed at such institutions as the Minneapolis Institute of Art (MIA), the Smithsonian, and the University of Virginia Library.
One of the challenges (and rewards) of managing a digital production lab for a university research library is working with the wide assortment of analog formats that are collected within its archives, special collections, and map library holdings. For instance, we’ve recently begun conversion work on a 2002 aerial survey of Connecticut that was originally shot on 9″x9″ positive black and white film.
Aerial photo transparencies are commonly turned into contact prints soon after the film is developed. And indeed, we have a large collection of these prints that we’ve digitized over the years at UConn. This type of reflective media can be converted in a couple of ways: you can either scan, or digitally photograph the prints at a sufficient spatial resolution. The Federal Agencies Digitization Guidelines Initiative (FADGI) suggest 6,000 pixels across the long dimension of the image area.