水平面以上天线高度
height calculation above sea level
层拉平水平切片
horizontal slice of level flattening
城市节水水平
the level of city water-saving
城市节水水平综合评价
Comprehensive Assessment of Urban Water Saving Level
多水平线性模型
multilevel linear model
hierarchical linear models
法线水平隔距
normal norizontal separation
浮动水平线
floating horizon algorithm