Sample of 3D polygons of roofs and DSM of buildings

Data are composed by two datasets: 1) a sample of pixels extracted from a DSM of buildings published by the Instituto Geográfico Nacional of Spain based on a normalized DSMs of buildings of 2.5 metres of resolution obtained from LiDAR data. 2) a sample of 3D polygons of roofs digitized from a 3D model of the city of Madrid (LoD 2) published by the City Council of Madrid.