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DEM中包含了丰富的地质地貌、水文等信息,是流域分析的主要数据来源之一。详细介绍了利用DEM数据提取流域水系信息特征的方法,并以岷江上游为例,对DEM进行预处理,然后采用ArcGIS 9.3软件平台下Hydrology模块提供的D8算法来确定水流离开DEM栅格单元的方向,并计算流向各栅格单元的水流累积量,再根据给定的集水面积阈值,提取岷江上游水系。实验结果表明,根据DEM生成的水系与实际基本相符。 更多还原

【Abstract】 DEM contains a wealth of geological features,hydrology and other information,is the watershed of one of the main sources of data.This paper described the method of extraction feature river basin using of DEM data,and upper reaches of Minjiang,for example,pretreatment of DEM.And then used the platform of Hydrology module which provided algorithm by ArcGIS to determine direction of flow in the DEM grid cell for each.Calculated for each grid cell of the upstream catchment area,according to the give... 更多还原