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Visualization of Disciplinary Profiles: Enhanced Science Overlay Maps

Stephen Carley

Stephen Carley

  • Search Technology Inc.Norcross, United States of America
  • Program in Science, Technology & Innovation Policy (STIP), School of Public Policy, Georgia Institute of TechnologyAtlanta, United States of America
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Carley, Stephen
, 
Alan L. Porter

Alan L. Porter

  • Search Technology Inc.Norcross, United States of America
  • Program in Science, Technology & Innovation Policy (STIP), School of Public Policy, Georgia Institute of TechnologyAtlanta, United States of America
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Porter, Alan L.
, 
Ismael Rafols

Ismael Rafols

  • Ingenio (CSIC-UPV), Universitat Politècnica de ValènciaValència, Spain
  • Science Policy Research Unit (SPRU), University of SussexBrighton, United Kingdom of Great Britain and Northern Ireland
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Rafols, Ismael
 und 
Loet Leydesdorff

Loet Leydesdorff

Amsterdam School of Communication Research (ASCoR), University of AmsterdamAmsterdam, The Netherlands
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Leydesdorff, Loet
  
22. Aug. 2017
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Artikel-Kategorie: Research Paper
Online veröffentlicht: 22. Aug. 2017
Seitenbereich: 68 - 111
Eingereicht: 20. Mai 2017
Akzeptiert: 21. Juli 2017
DOI: https://doi.org/10.1515/jdis-2017-0015
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© 2017 Stephen Carley, Alan L. Porter, Ismael Rafols & Loet Leydesdorff
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Purpose

The purpose of this study is to modernize previous work on science overlay maps by updating the underlying citation matrix, generating new clusters of scientific disciplines, enhancing visualizations, and providing more accessible means for analysts to generate their own maps.

Design/methodology/approach

We use the combined set of 2015 Journal Citation Reports for the Science Citation Index (n of journals = 8,778) and the Social Sciences Citation Index (n = 3,212) for a total of 11,365 journals. The set of Web of Science Categories in the Science Citation Index and the Social Sciences Citation Index increased from 224 in 2010 to 227 in 2015. Using dedicated software, a matrix of 227 × 227 cells is generated on the basis of whole-number citation counting. We normalize this matrix using the cosine function. We first develop the citing-side, cosine-normalized map using 2015 data and VOSviewer visualization with default parameter values. A routine for making overlays on the basis of the map (“wc15.exe”) is available at http://www.leydesdorff.net/wc15/index.htm.

Findings

Findings appear in the form of visuals throughout the manuscript. In Figures 1–9 we provide basemaps of science and science overlay maps for a number of companies, universities, and technologies.

Research limitations

As Web of Science Categories change and/or are updated so is the need to update the routine we provide. Also, to apply the routine we provide users need access to the Web of Science.

Practical implications

Visualization of science overlay maps is now more accurate and true to the 2015 Journal Citation Reports than was the case with the previous version of the routine advanced in our paper.

Originality/value

The routine we advance allows users to visualize science overlay maps in VOSviewer using data from more recent Journal Citation Reports.

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Englisch
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