The paper describes the principle of multicast and its route protocol, designs a system of collecting video data, and analyses a network of real time video data transmission.

论述了组播传输技术的原理和相关的路由协议，设计了一个视频信息的采集系统，分析了实时视频信息组播传输网络。

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The sightseeing garden glasshouse has video monitoring system and data collecting system which present the use of modern information technology in urban agriculture.

观光园温室安装有视频监测系统和温室数据采集系统，它是现代信息技术在都市农业中的应用。

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But it also uses other metrics, including total time spent, and last year began collecting data on video streams initiated by users at sites such as Google's YouTube, which it said provided a more accurate picture of the online video audience than unique visitors did.

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