Design and update of a classification system: The UCSD map of science

Global maps of science can be used as a reference system to chart career trajectories, the location of emerging research frontiers, or the expertise profiles of institutes or nations. This paper details data preparation, analysis, and layout performed when designing and subsequently updating the UCSD map of science and classification system. The original classification and map use 7.2 million papers and their references from Elsevier's Scopus (about 15,000 source titles, 2001-2005) and Thomson Reuters' Web of Science (WoS) Science, Social Science, Arts & Humanities Citation Indexes (about 9,000 source titles, 2001-2004)-about 16,000 unique source titles. The updated map and classification adds six years (2005-2010) of WoS data and three years (2006-2008) from Scopus to the existing category structure-increasing the number of source titles to about 25,000. To our knowledge, this is the first time that a widely used map of science was updated. A comparison of the original 5-year and the new 10-year maps and classification system show (i) an increase in the total number of journals that can be mapped by 9,409 journals (social sciences had a 80% increase, humanities a 119% increase, medical (32%) and natural science (74%)), (ii) a simplification of the map by assigning all but five highly interdisciplinary journals to exactly one discipline, (iii) a more even distribution of journals over the 554 subdisciplines and 13 disciplines when calculating the coefficient of variation, and (iv) a better reflection of journal clusters when compared with paper-level citation data. When evaluating the map with a listing of desirable features for maps of science, the updated map is shown to have higher mapping accuracy, easier understandability as fewer journals are multiply classified, and higher usability for the generation of data overlays, among others.

Keywords

article, citation analysis, classification, cluster analysis, computer interface, computer program, computer system, Internet, online system, process design, scientific literature, Bibliometrics, Databases, Bibliographic, Humanities, Humans, Internet, Natural Science Disciplines, Research Design, Social Sciences, Scopus

Citation

Borner, K., Klavans, R., Patek, M., Zoss, A.M., Biberstine, J.R., Light, R.P., Lariviere, V., & Boyack, K.W. (2012). Design and update of a classification system: The UCSD map of science. PLoS ONE, 7(7): e39464. http://dx.doi.org/10.1371/journal.pone.00394647

Link(s) to data and video for this item

https://doi.org/10.1371/journal.pone.0039464

Rights

© 2012, Borner et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
http://creativecommons.org/licenses/by/3.0/

Type

Article

Collections

Faculty Peer Reviewed Papers

Full item page