Interactive overlays: A new method for generating global journal maps from Web-of-Science data |
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| Authors: | Loet Leydesdorff Ismael Rafols |
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| Institution: | 1. Amsterdam School of Communications Research (ASCoR), University of Amsterdam, Kloveniersburgwal 48, 1012 CX Amsterdam, The Netherlands;2. SPRU (Science and Technology Policy Research), University of Sussex, Freeman Centre, Falmer Brighton, East Sussex BN1 9QE, United Kingdom;1. SAP Deutschland SE & Co. KG, Hasso-Plattner-Ring 7, 69190 Walldorf, Germany;2. Fraunhofer Institute for Systems and Innovation Research ISI, Breslauer Strasse 48, 76139 Karlsruhe, Germany;3. Berlin University of Technology, Chair of Innovation Economics, VWS 2, Müller Breslau-Strasse, 10623 Berlin, Germany;1. School of Information Management, Wuhan University, Wuhan 430072, China;2. School of Economics and Management, Beijing University of Technology, Beijing 100024, China;1. ISEG (Lisbon School of Economics & Management), Universidade de Lisboa, Rua do Quelhas, 6, 1200-781 Lisboa, Portugal;2. Research Unit on Complexity and Economics (UECE), Rua Miguel Lupi, 20, 1249-078 Lisboa, Portugal;1. Universidad Carlos III de Madrid, Departamento de Economía, Spain;2. Universitat Rovira i Virgili, Department d’Enginyeria Quimica, Spain;3. Istituto dei Sistemi Complessi (ISC-CNR), and Dipartimento di Fisica, “Sapienza” Universita’ di Roma, Italy;1. École de bibliothéconomie et des sciences de l’information, Université de Montréal, PO Box 6128, Downtown Station, Montreal, Quebec, H3C 3J7, Canada;2. Observatoire des Sciences et des Technologies (OST), Centre Interuniversitaire de Recherche sur la Science et la Technologie (CIRST), Université du Québec à Montréal, PO Box 8888, Downtown Station, H3C 3P8 Montréal, Qc., Canada |
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| Abstract: | Recent advances in methods and techniques enable us to develop interactive overlays to a global map of science based on aggregated citation relations among the 9162 journals contained in the Science Citation Index and Social Science Citation Index 2009. We first discuss the pros and cons of the various options: cited versus citing, multidimensional scaling versus spring-embedded algorithms, VOSViewer versus Gephi, and the various clustering algorithms and similarity criteria. Our approach focuses on the positions of journals in the multidimensional space spanned by the aggregated journal–journal citations. Using VOSViewer for the resulting mapping, a number of choices can be left to the user; we provide default options reflecting our preferences. Some examples are also provided; for example, the potential of using this technique to assess the interdisciplinarity of organizations and/or document sets. |
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