Floor Covering

Information level of the official survey in which objects such as buildings, fortified areas, humusated areas, water surfaces, covered areas and vegetationless areas are summarised.本官方调查的信息层级，对建筑物、防御工事区域、腐殖质覆盖区、水域、覆被区域及无植被区域等地物要素进行了归纳汇总。