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。
With the universalization of the digital devices and network, digital family technique is becoming the main-stream of modern digital technique.
随着数字设备和网络的普及，数字家庭技术正日益成为现代数字的主流技术。
And the streaming server also has IPTV STB (set-top box) function to receive video-audio digital stream from network and play the video-audio digital stream after decoding.
该流服务器还具有IPTV机顶盒的功能，从网络上接收视音数字流解码后在电视机上播放。
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