MESUR: science maps and rankings from large-scale usage data
The MESUR project studies science from large-scale usage data collected from some of the world's most signficant publishers, aggregators and university consortia.
There are two interactive mapping services to choose from:
The PLoS ONE map of science
Explore an interactive version of the map of science published in PLoS ONE:
Bollen J, Van de Sompel H, Hagberg A, Bettencourt L, Chute R, et al. 2009 Clickstream Data Yields High-Resolution Maps of Science. PLoS ONE 4(3): e4803. doi:10.1371/journal.pone.0004803
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An interactive map of science with impact ranking metrics
This map of science is based on a large sample of journals than the PLoS ONE version and contains an interactive journal ranking service.