2D Building Footprints

The 2D footprint dataset represents building roof footprint extents and should not be confused with the building industry floor footprint. This dataset was created from photogrammetrically captured 3D building models. They have been verified using land parcels, the city ortho mosaic and oblique imagery. They can be used in 2D representations and 3D scenes with a DEM. The year:month of aerial imagery acquisition used in the data capture can be found as an attribute in the feature class table, and the annually occurring additions and updates are indicated there. All spatial layers are served live from internal systems, an item's "Last Updated" or "Publish Date" refers to the Metadata only.本二维足迹数据集指代建筑屋顶足迹范围，请勿与建筑行业中的楼层足迹概念相混淆。本数据集基于摄影测量采集的三维建筑模型生成，已通过地块数据、城市正射镶嵌影像（Ortho Mosaic）及倾斜摄影影像完成核验。本数据集可应用于二维可视化表达，以及结合数字高程模型（Digital Elevation Model，DEM）搭建的三维场景中。数据采集所用航空影像的获取年月，可在要素类表的属性字段中查询；数据集的年度新增与更新记录也会同步标注于此。所有空间图层均由内部系统实时提供服务，数据项的“最后更新时间”或“发布日期”仅针对元数据（Metadata）有效。