Brussels-Capital Region: The geotechnical maps of Brussels were elaborated by J.P. Dam, under the direction of prof. J. Nuyens, V. Roisin and R. Thonnard of the Université Libre de Bruxelles (ULB) and of the Vrije Universiteit Brussel (VUB), members of the Centre Interuniversitaire pour la Cartographie Géotechnique directed by J. Nuyens (ULB). They were then published at a scale of 1/5000 between 1976 and 1990 by the ‘Institut Géotechnique de l’Etat’ (State Geotechnical Institute). The constituent documents (maps and associated reports) provide an overview of the following points: - tests carried out in the region ; - depth of the water table ; - nature and position of the tertiary substratum ; - nature and strength of the various surface layers; - units with a specific overlay of the formations encountered. Their initial objective was to respond to the needs of the builders for synthetic and easily accessible documentation relating to the subsoil of the Brussels region. The plates and documents provided did not claim absolute precision because of the interpolations and extrapolations necessary for their establishment. The present archive is presented in three forms: - Digitized maps and associated FR/NL explanatory notes .pdf ; - Georeferenced 'raster' maps (lambert 72); - Vector' maps (lambert 72). List of available maps: 31.2.4; 31.2.6; 31.2.8; 31.3.1; 31.3.2; 31.3.3; 31.3.4; 31.3.5; 31.3.6; 31.3.7; 31.3.8; 31.4.7; 31.7.1; 31.7.2; 31.7.3.

Brussels-Capital Region : The geological model BRUSTRATI3D v1.1 is a set of raster files covering the Brussels-Capital Region. These files contain the roof elevations and the thicknesses of the Stratigraphic Units (SU/BCR) and the Digital Terrain Model (DTM) of the topographic surface used in this model. These rasters have a 10x10m resolution and their reference coordinate system is EPSG 31370 (Belgian Lambert 31370). The documentation relating to the construction oh these data is available at the following addresses (French only): BRUSTRATI3D v1.1 https://document.environnement.brussels/opac_css/index.php?lvl=notice_display&id=10965 BRUSTRATI3D v1.0 https://document.environnement.brussels/opac_css/index.php?lvl=notice_display&id=10964 As the data in this archive is model-based, it may contain errors, inaccuracies and gaps. They should be used with caution and critical thinking. They can in no way replace a field study carried out by an expert. In general, Brussels Environment and the Geological Survey of Belgium cannot, under any circumstances, be held responsible for any damage, direct or indirect, resulting from the use of these data or the impossibility of using them for any reason whatsoever.