Discovering hidden arches, visualising the sloped outline characteristic of the medieval period, finding a Renaissance engraving on a roman arch or detecting restorations: these are some of the results that have been obtained by researchers at the University of Vigo (Spain) in their study of more than 80 roman and medieval bridges. The assessment was carried out with the help of a ground-penetrating radar, a laser scanner and mathematical models, ...

http://phys.org/news/2014-03-laser-radar-unveil-secrets-roman.htm

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