A method of distinguishing watershed borderline, of ascertaining water flow direction on a slope, and of calculating watershed parameters with digital elevation model is introduced and discussed.
探讨了利用数学高程模型识别流域分水线、确定坡面水流方向以及计算流域参数的方法。
By means of GIS method, the digital elevation model(DEM)is established, the flow direction, flow accumulation, subcatchment boundaries and stream network spatial distribution are studied.
采用GIS的方法，建立了环县数字高程模型（DEM），研究了本区地表水流方向、集流能力、子集水区的划分及水系网络空间分布等水文特征。
The seasonal snow cover in Urumqi River Basin varies temperally, influenced by air temperature, precipitation, moisture source, slope direction, elevation and ground surface condition.
乌鲁木齐河流域的季节积雪受气温、降水量、水汽来向、山坡朝向、海拔和下垫面性质所控制和影响，具有明显的空间变化规律。
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