住宅楼的总层数。
商业部分建筑面积为12万平方米，总层数为4层。
The business construction area covers 120,000 m2, 4 floors in total.
虚拟传感器的层数增加时，融合后总的估计误差将减少。
The total number of estimation errors from data fusion will be decreased when layers of virtual sensors are increased.
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