rainfall isopleth雨量等值线
isopleth graph等值线统计图
isopleth map等值线图
isopleth method等值线法
drawing isopleth等值线
normal isopleth平均等值线
isopleth radiation[核] 辐射等值线
isopleth surface等值面
isopleth mapping等值线制图
N(名词) a line on a map connecting places registering the same amount or ratio of some geographical or meteorological phenomenon or phenomena 等值线 (Also called isogram, isoline)