Combination of GPR and LiDAR for the Characterisation of Building Pathology in Cultural Heritage: the Hermitage of San Segundo (Spain)

Abstract

This work presents a combined study of complementary non-destructive techniques, GPR (Ground- Penetrating Radar) and Light Detection and Ranging (LiDAR). to analyze pathologies in a heritage building. The GPR survey was conducted with 2.3 GHz antennas. The Terrestrial Laser Scanner (TLS) used has a ±2 mm accuracy. LiDAR revealed a lateral thrust of the main nave of the hermitage, and moisture at the side wall of the altar. GPR allowed to determine the presence of moisture inside the wall. The joint interpretation of all the data allowed to highlight moisture as the cause of stone degradation, thus affecting the structural integrity of the nave. The interpretations thus obtained enables to define most appropriate maintenance interventions.