Soil differential settlements that cause structural damage to heritage buildings are precipitating cultural and economic
value losses. Adequate damage assessment as well as protection and preservation of the built patrimony are priorities at
national and local levels, so they require advanced integration and analysis of environmental, architectural and historical
parameters. The GEPATAR project (GEotechnical and Patrimonial Archives Toolbox for ARchitectural conservation in
Belgium) aims to create an online interactive geo-information tool that allows the user to view and to be informed about
the Belgian heritage buildings at risk due to differential soil settlements.
Multi-temporal interferometry techniques (MTI) have been proven to be a powerful technique for analyzing earth surface
deformation patterns through time series of Synthetic Aperture Radar (SAR) images. These techniques allow to measure
ground movements over wide areas at high precision and relatively low cost. In this project, Persistent Scatterer Synthetic
Aperture Radar Interferometry (PS-InSAR) and Multidimensional Small Baseline Subsets (MSBAS) are used to measure
and monitor the temporal evolution of surface deformations across Belgium.
This information is integrated with the Belgian heritage data by means of an interactive toolbox in a GIS environment in
order to identify the level of risk. At country scale, the toolbox includes ground deformation hazard maps, geological
information, location of patrimony buildings and land use; while at local scale, it includes settlement rates, photographic
and historical surveys as well as architectural and geotechnical information. Some case studies are investigated by means
of on-site monitoring techniques and stability analysis to evaluate the applied approaches.
This paper presents a description of the methodology being implemented in the project together with the case study of the
Saint Vincent’s church which is located on a former colliery zone. For this building, damage is assessed by means of PSInSAR.
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