Automated analyses of degradations
If the digital acquisition of a monument aims in the first place at exhaustively determine its geometry, current sensors and data processing software also facilitate the extraction of information related to the different pathologies of degradation of the digitized surfaces. The cartographies thus generated can be used by restorers and curators.
A methodology has been developed by our company that uses morphological and chromatic analysis of the data to produce a preliminary automated mapping of the pathologies of the facings, according to the rules defined by ICOMOS.
In 2018, Archéotech was commissioned to carry out a complete survey of Lausanne Cathedral. The interior and exterior were measured by laserometry and photogrammetry. The data collected allowed the development of an application for the automated detection of various stone pathologies. Thanks to the analysis of the micromorphology, colorimetry and laser photometry of the surfaces, the degradations of the exterior facings of the cathedral could be mapped and quantified, with particular attention to the damage due to water runoff, by determining the biological colonisations, crusts and gaps.