DBGT10K — Cover element

It describes one of the various roofing parts of a building, i.e. groundwater, terraces, domes, etc. but also elements to complement the roofing and that are mutually exclusive to the groundwater in the view from above, i.e. “the roofing pitches”. While the elements at the top but superimposed on the roofs (i.e. that do not pierce the groundwater as the case of the comignoli) are described among the architectural details. See: Acquisition of two of the four roofing layers of the Cassone Edilizio Among the objects that participate in the three-dimensional modeling are the coverings of the building. These shall be cut at most on each building such that each roof is made up of one or more pitches, and each aquifer as a separate surface with a contour of a broken 3D closed; the summits of the broken have the q value of the share they compete. With reference to the proposed three-dimensional model, the reference area shall be that of each layer of the roof to which is associated as the extrusion part that of the point of the groundwater with a minimum altitude; in this case this quota is still the eaves share of the building. The planimetric and altimetric geometrical consistency between the groundwater and the built-up bodies that they cover shall be verified. Can be extrusion surfaces of the roofing elements also the coverings of the penthouse floors, the terraces, well terraces inserted into the rooftops, those located on towers, etc... For all these types of extrusion surfaces the relative share of extrusion will be the share of eaves of the building on which they insist. In addition, the flat or inclined pitches of semi-spherical domes or assimilable to them are included, which will be divided into wedges of contour (closed polyline 3D). Each clove will constitute extrusion surface and its extrusion quota will be the quota of the base of the dome.本数据集描述了建筑各类屋面构件中的一类，即屋面基准面（groundwater）、露台、穹顶等，同时涵盖用于补充屋面系统的各类构件；从俯视视角来看，此类补充构件与屋面基准面（groundwater）互斥，即“屋顶坡面（roofing pitches）”。而那些位于屋顶上方且叠置于屋面之上（例如不会穿透屋面基准面（groundwater）的烟囱突出构件（comignoli））的构件，则归类于建筑细部范畴。详见：《建筑构件库（Cassone Edilizio）四层屋面结构中两层的采集规范》。参与三维建模的建筑对象包含建筑屋面围护层，此类构件需按单栋建筑进行拆分，使得每座屋顶由一个或多个坡面组成，且每个蓄水层（aquifer）均作为独立曲面存在，其轮廓为三维闭合折线；该折线的顶点对应其所匹配的标高数值（q值）。针对所提出的三维模型，参考区域应为各屋面层的对应区域，其拉伸（extrusion）部分对应屋面基准面（groundwater）的最低标高点位；此情况下，该标高即为建筑的檐口标高。需验证屋面基准面（groundwater）与其覆盖的建筑实体之间的平面与标高几何一致性。屋面构件的拉伸曲面还可包括顶层阁楼地面、露台、嵌入屋面的露台以及塔楼顶部露台等的围护面层，针对所有此类拉伸曲面，其相对拉伸标高均为其所坐落的建筑的檐口标高。此外，本数据集还涵盖半球形穹顶或类半球形穹顶的平面或倾斜坡面，此类坡面将被划分为若干轮廓为三维闭合多段线（closed polyline 3D）的楔形区域，每个楔形块（clove）均构成一个拉伸曲面，其拉伸标高为穹顶基座的标高。