基于P2P的海量水利遥感影像优化传输策略*

海量水利遥感影像的网络传输与处理是用户及时获取遥感水利产品的关键。针对传统的基于客户端/服务器结构网络传输模式难以满足大量用户并发请求及时响应的问题，提出一种基于P2P思想的海量水利遥感影像传输优化策略，充分利用客户端资源进行数据处理与调度，减少服务器负载，并设计了抢占式传输机制，提高影像传输速度。通过原型系统Hydro-PNet(Hydro-Processing Peer-to-Peer Network)测试表明，该策略有效地提高了数据传输速度，减少了用户请求响应时间。

Optimization strategy of massive hydrographic image transmission based on P2P

In hydrographic remote sensing data processing platform, large-scale image transmission and processing are very important for users to get their products in time. Aiming at the shortcoming that the server cannot guarantee the response time when the number of users is quickly increasing in traditional C/S mode, this paper proposes an optimal data transmission mode for large-scale data transmission based on peer - to - peer (P2P) technologies. The mechanism aims to use the client's resource fully and reduce server's load. Meanwhile the preemptive transmission algorithm is given to improve the efficiency of data transmission. Finally, a prototype system Hydro-PNet(Hydro-Processing Peer-to-Peer Network) is established and experimental results show that the paper's strategy can improve the image data transmitting speed and greatly reduce the response time of the hydrographic image request.