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Fig. 8.23
An interactive science overlay map of Glaxo-SmithKline's publications between 2000
and 2009. The
red circles
are GSK's publications in clinical medicine (as moving mouse-over the
Clinical Medicine label) (Reprinted from Rafols et al.
2010
with permission, available at
http://idr.
an overlay. The strength of this overlay approach is that one can easily identify the
activity of an institution with references spreading over multiple disciplinary regions
as well as an institution with a much focused discipline.
The flexibility of the science overlay maps has been demonstrated in studies
of interdisciplinarity of fields over time (Porter and Rafols
2009
), comparing
departments, universities and R&D bases of large corporations (Rafols et al.
2010
),
and tracing the diffusion of research topics over science (Leydesdorff and Rafols
2011
). Figure
8.24
shows a more recent base map generated by Loet Leydesdorff in
VOSViewer.
8.4.3
Dual-Map Overlays
Many citation maps are designed to show either the sources or the targets of citations
in a single display but not both. The primary reason is that a representation with
a mixed of citing and cited articles may considerably increase the complexity of
its structure and dynamics. There doesn't seem to be a clear gain if we combine
them together in a single view. Although it is conceivable that a combined structure
may be desirable in situations such as a heated debate, researchers are in general
more concerned with differentiating various arguments before considering how to
combine them.
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