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.本数据集由两个子数据集构成：1. 像素样本数据集：提取自西班牙国家地理研究所（Instituto Geográfico Nacional of Spain）发布的建筑数字表面模型（Digital Surface Model，DSM），该DSM的原始数据为基于激光雷达（Light Detection and Ranging，LiDAR）数据生成的分辨率为2.5米的建筑归一化数字表面模型。2. 屋顶三维多边形样本数据集：从马德里市议会（City Council of Madrid）发布的马德里市细节层次2（Level of Detail 2，LoD2）三维模型中数字化提取得到的屋顶三维多边形样本。