Buildings as Sound Barriers (WFS Service)

Block model (LOD1) for noise mapping 2022
LOD1 building heights are automatically determined by calculating an average value from the heights of the laser scanner data within the floor plans. For photogrammetric measurement, the mean value between ridge and eave height is used.
Floor plans may be divided if this average differs too much from the building parts due to different heights (> 2 m, > 20 m2) and then new averages of the building parts are calculated. Thus, in the LOD1 block model, an accurate representation of the roof landscape is achieved, depending on the roof shape, the absolute height accuracy is < 3 m.

用于2022年噪声制图的细节层次1（Level of Detail 1，LOD1）块模型。
LOD1的建筑高度通过提取建筑平面图内激光扫描仪数据的高度值并计算平均值自动确定；对于摄影测量作业，则采用屋脊高度与檐口高度的平均值作为建筑高度。
若因建筑各部分高度差超过2米且单部分面积大于20平方米，导致该平均值与建筑实际部分偏差过大，则可拆分建筑平面图，并重新计算各建筑部分的高度平均值。因此，在LOD1块模型中，可基于屋顶形态实现对屋顶轮廓的精准呈现，其绝对高度精度小于3米。