On the base of the DEM, the spatial distribution of flow directions, watershed boundaries and stream networks of Tangwanghe Catchment were studied.
根据DEM数据，确定了汤旺河流域的地表水流方向、集水区的划分及水系网络空间分布特征。
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 technology of video stream transcoding can be divided into two types: spatial domain(pixel-domain) and compressed domain(DCT-domain).
目前的视频流转码大致可以分为空域（像素域）转码和压缩域（DCT域）转码两种方法。
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