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The buildings are modeled on the basis of a photogrammetric exploitation of the aerial images of 2017. The definition of the LOD 2.3 used includes a detailed modeling of the shape of the roofs (without details like skylights, chimneys, antennas, solar panels, ...) with a vertical projection to the ground. These data can be consulted in the 3D web viewer of geoportail.lu. This type of building modeling is not yet available for the entire country. As part of the LiDAR pilot project in 2017, this building modeling was carried out over an area of 3 km2 (2 km2 in Diekirch and 1 km2 in Bastendorf). The origin of these data restricts the separation of units at the building block level. The exploitation of aerial images for the modeling of 3D surfaces does not allow a distinction of units by cadastral parcels. (Eg terraced houses) The data is available as CityGML files https://www.opengeospatial.org/standards/citygml, a standard format for exchanging 3D data. Data not transformed into INSPIRE data model
Buildings from the official carto-/topographic database (BD-L-TC). The BD-L-TC is a vector dataset at the scale 1:5000 which represents the earth surface's objects on the national territory, with attributes in german, french and english. This dataset has been harmonized according to the INSPIRE theme "Buildings" data specification.
The buildings are derived from data from the topographic database (BD-TOPO-L) of the Cadastre and Topography Administration, based on 2013 aerial imagery. Data of type LOD 1 (Level of detail 1) represents simple blocks without details on roofs. The height of the blocks is defined by the average height of the outer perimeter of the roofs from photogrammetric measurements (i.e. the extraction of horizontal (X, Y) and vertical (Z) information based on aerial images) . The survey of these roof perimeters is part of the 2013 topographic survey for the updating of the topography database (BD-TOPO-L). The origin of these data restricts the resolution of units at building block level, smaller units such as annexes or remarkable building parts (e.g. church towers) are indistinguishable. The data is available as CityGML files, a standard format for exchanging 3D data. Buildings can be downloaded as ZIP files by municipality (+/- 10 MB / MB per file), by canton (+/- 40 MB / MB per file) or for the whole country (+/- 600 MB / MB). The data are projected in LUREF (EPSG: 2169), ie a coordinate reference system using values in meters [m]. Data not transformed into INSPIRE data model
Buildings of the cadastral map PCN. This dataset has been harmonized according to the INSPIRE theme "Buildings" data specification.