P2P 环境下影像数据流传输的资源定位及选择研究.pdf

文档介绍：第 39 卷
第 4 期测
绘
学
报 Vol. 39, No. 4
20
10 年 8 月 Acta Geoda etica et Ca rtographica Sinica Aug. , 2010
文章编号: 1001
1595( 2010) 04
0383
07
P2P 环境下影像数据流传输的资源定位及选择研究
刘
异1 , 龚健雅2 , 呙
维2
1. 武汉大学测绘学院, 湖北武汉 430074; 2. 武汉大学测绘遥感信息工程国家重点实验室, 湖北武汉 430074
Resource Loca ting and Selection for Spatial Image Streaming on work
LIU Yi1 , GONG Jianya 2 , GUO Wei2
1. School of Geodesy a nd Geomati cs, Wuha n University, Wuha n 430074, China ; 2. State Key La bora tory of Informa tion Engi nee
ri ng in Surveying, Ma ppi ng a nd Remote Sensing, Wuha n 430074, China
Abstract : The a uthors explore non
linea r content ess mode of spatia l data on virtual earth, and then a dopt grid
based peer group for resource loca ting on top of tra ditional P2P locating method. Further, peer selection
mecha nisms to optimize the results of resource locating are discussed. Historical download speed records are
combined to estimate the preference of peer so tha t high ca pa city a nd reliable peer ca n be chosen firstly. Two
modes of our peer selection mecha nism that a re loca l optima l a nd non
equal probability ha ve been tested through
ma ny simulative experiments. Results show the better effects with our peer selection paring to
random peer selection, a nd a lso tell that effectiveness of peer selection mecha nism is rela ted to applica tion
scenario such as peer number, file size a nd user