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Dear colleagues,
Using “Analyze Results” at the Web-of-Science (WoS), it is possible to save a file “analyze.txt” that contains the information needed to make a journal overlay map on top of the 10,000+ journals included in the JCR 2011 (without downloading the records!). The routine analyze.exe (at http://www.leydesdorff.net/journals11/analyze.exe ) also provides the Rao-Stirling diversity value of the resulting map as an indicator of the interdisciplinarity in the retrieval. The system works also with large sets using VOSViewer for the representation (label map, heat map, and cluster density map).
For further instructions and elaboration see the most recent version of our forthcoming paper:
Leydesdorff, L., Rafols, I., & Chen, C. (in press). Interactive Overlays of Journals and the Measurement of Interdisciplinarity on the basis of Aggregated Journal-Journal Citations. Journal of the American Society for Information Science and Technology; available as preprint at http://arxiv.org/abs/1301.1013 and/or http://www.leydesdorff.net/journals11 .
Feel free to provide feedback to further improve the system. The objective is to make this work smoothly between WoS and VOSViewer in terms of providing maps of science and interdisciplinarity-indicators. The maps can be animated by bringing them into PowerPoint (because the basemap in the background is stable).
Best wishes,
Loet
** apologies for cross-postings
Professor, University of Amsterdam
Kloveniersburgwal 48, 1012 CX
Tel. +31-20-525 6598; fax: +31-842239111
[log in to unmask] ; http://www.leydesdorff.net/
Visiting Professor, ISTIC, Beijing; Honorary Fellow, SPRU, University of Sussex; http://scholar.google.com/citations?user=ych9gNYAAAAJ&hl=en