<abstract xmlns="http://www.w3.org/1999/xhtml"><sec id="j_jdis-2017-0015_s_005_w2aab3b8c26b1b7b1aab1c15b1Aa"><h3>Purpose</h3><p>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.</p></sec><sec id="j_jdis-2017-0015_s_006_w2aab3b8c26b1b7b1aab1c15b2Aa"><h3>Design/methodology/approach</h3><p>We use the combined set of 2015 <italic>Journal Citation Reports</italic> for the Science Citation Index (<italic>n</italic> of journals = 8,778) and the Social Sciences Citation Index (<italic>n</italic> = 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 <ext-link ext-link-type="uri" xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="http://www.leydesdorff.net/wc15/index.htm">http://www.leydesdorff.net/wc15/index.htm</ext-link>.</p></sec><sec id="j_jdis-2017-0015_s_007_w2aab3b8c26b1b7b1aab1c15b3Aa"><h3>Findings</h3><p>Findings appear in the form of visuals throughout the manuscript. In <xref ref-type="fig" rid="j_jdis-2017-0015_fig_001_w2aab3b8c26b1b7b1ab1b1b2b9aAa">Figures 1</xref>–<xref ref-type="fig" rid="j_jdis-2017-0015_fig_009_w2aab3b8c26b1b7b1ab1b2c16aAa">9</xref> we provide basemaps of science and science overlay maps for a number of companies, universities, and technologies.</p></sec><sec id="j_jdis-2017-0015_s_008_w2aab3b8c26b1b7b1aab1c15b4Aa"><h3>Research limitations</h3><p>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.</p></sec><sec id="j_jdis-2017-0015_s_009_w2aab3b8c26b1b7b1aab1c15b5Aa"><h3>Practical implications</h3><p>Visualization of science overlay maps is now more accurate and true to the 2015 <italic>Journal Citation Reports</italic> than was the case with the previous version of the routine advanced in our paper.</p></sec><sec id="j_jdis-2017-0015_s_010_w2aab3b8c26b1b7b1aab1c15b6Aa"><h3>Originality/value</h3><p>The routine we advance allows users to visualize science overlay maps in VOSviewer using data from more recent <italic>Journal Citation Reports</italic>.</p></sec></abstract>

PurposeThe 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/approachWe 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.FindingsFindings 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 limitationsAs 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 implicationsVisualization 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/valueThe routine we advance allows users to visualize science overlay maps in VOSviewer using data from more recent Journal Citation Reports.

Visualization of Disciplinary Profiles: Enhanced Science Overlay Maps

United Kingdom of Great Britain and Northern Ireland

Amsterdam School of Communication Research (ASCoR)

Journal of Data and Information Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Visualization of Disciplinary Profiles: Enhanced Science Overlay Maps"}

PurposeThe purpose of this study is to modernize previous work on science overlay maps by updating the underlying citation matrix, generating new clusters of...

Visualization of Disciplinary Profiles: Enhanced Science Overlay Maps

Article Category: Research Paper

Published Online: Aug 22, 2017

Page range: 68 - 111

Received: May 20, 2017

Accepted: Jul 21, 2017

DOI: https://doi.org/10.1515/jdis-2017-0015

Keywords
Science overlay maps, Science visualization, Scientometrics, Bibliometrics, Interdisciplinary research, Multidisciplinarity, Research policy, Research management

© 2017 Stephen Carley, Alan L. Porter, Ismael Rafols & Loet Leydesdorff

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Visualization of Disciplinary Profiles: Enhanced Science Overlay Maps

Article Category: Research Paper

Published Online: Aug 22, 2017

Page range: 68 - 111

Received: May 20, 2017

Accepted: Jul 21, 2017

DOI: https://doi.org/10.1515/jdis-2017-0015

KeywordsScience overlay maps, Science visualization, Scientometrics, Bibliometrics, Interdisciplinary research, Multidisciplinarity, Research policy, Research management

© 2017 Stephen Carley, Alan L. Porter, Ismael Rafols & Loet Leydesdorff

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
Science overlay maps, Science visualization, Scientometrics, Bibliometrics, Interdisciplinary research, Multidisciplinarity, Research policy, Research management