Two years after fire swept through the roof of France’s medieval Notre Dame de Paris cathedral, rescue and recovery work is winding down as restoration is set to start this summer. Stone masonry and other traditional crafts will take center stage over the next three years, but digital models of the edifice before and after the fire will guide progress.
Enough data to create a digital twin of the cathedral building was already on the servers of the locally based survey company Art Graphique & Patrimoine (AGP) before the April 15, 2019, fire. To capture the damaged building's geometry, an AGP team completed another survey four days later.