Critical verification of the underground cartography of the municipality using a high performance Ground Penetrating Radar

Summary The city of Florence, Italy has a modern and continuously updated underground map archive. After the construction of a new parking area in a terrain of the University of Florence, the area has been mapped using a high performance Step Frequency Continuous Wave Ground Penetrating Radar. The images acquired by the GPR have been compared with the official cartography. We noted important features not reported in the map. This confirm the necessity of GPR survey also in city provided with modern and updated underground cartography.