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Journal Maps, Interactive Overlays, and the Measurement of 
Interdisciplinarity on the Basis of Scopus Data (1996-2012)

Loet Leydesdorff, Félix de Moya-Anegón, and Vicente P. Guerrero-Bote

Using Scopus data, we construct a global map of science based on aggregated
journal-journal citations from 1996-2012 (N of journals = 20,554). This base
map enables users to overlay downloads from Scopus interactively. Using a
single year (e.g., 2012), results can be compared with mappings based on the
Journal Citation Reports at the Web-of-Science (N = 10,936). The Scopus maps
are richer at both the local and global levels because of their greater
coverage, including, for example, the arts and humanities. The base maps can
be interactively overlaid with journal distributions in sets downloaded from
Scopus, for example, for the purpose of portfolio analysis. Rao-Stirling
diversity can be used as a measure of interdisciplinarity in the sets under
study. Maps at the global and the local level, however, can be very
different because of the different levels of aggregation involved. Two
journals, for example, can both belong to the humanities in the global map,
but participate in different specialty structures locally. The base map and
interactive tools are available online (with instructions) at   
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