Overlay Maps of Science
(2010 update)
Ismael Rafols1,2, Alan Porter2 and Loet Leydesdorff3
1 SPRU,
University of Sussex, Brighton
2 School of Public Policy, Georgia Institute Technology, Atlanta
3 Amsterdam School of Comm. Res. (ASCoR), Univ. Amsterdam
Rafols, I., Porter, A. L. and Leydesdorff, L. (2010) Overlay science maps: a new tool for research policy and library
management. Journal of the American Society for Information Science and Technology. 61(9), 871–
1887. PDF. Interactive Maps. Overlay toolkit.
Global Map of Science, 2010 update
224 Web of Science Categories
Environmental S&T
4 Factors with Pajek
Bio logy and
Medicine
Physical Science
and Engineering
Psychology and
Social Sciences
Method from Rafols, Porter and Leydesdorff (2009)
Global Map of Science, 2010 update
224 Web of Science Categories
6 Factors with Pajek
Environmental S&T
Bio logy and
Medicine
Physical S&T
Psychology and
Social Issues
Social Sciences
Computer Sci.
and Engineering
Method from Rafols, Porter and Leydesdorff (2009)
Global Map of Science, 2010 update
224 Web of Science Categories
19 Factors with Pajek
Agri Sci
Ecol Sci
Geosciences
Infectious
Diseases
Environ Sci & Tech
Clinical Med
Mech Eng
Chemistry
Materials Sci
Biomed Sci
Psychological Sci.
Physics
Health & Social Issues
Clinical
Psychology
Computer Sci
Math Methods
Social Studies
Business & MGT
Econ Polit & Geography
Method from Rafols, Porter and Leydesdorff (2009)
Global Map of Science, 2010 update
224 Web of Science Categories
Agri Sci
Insert Pajek Image on top
Ecol Sci
Geosciences
Infectious
Diseases
Environ Sci & Tech
Clinical Med
Mech Eng
Chemistry
Materials Sci
Biomed Sci
Psychological Sci.
Physics
Health & Social Issues
Clinical
Psychology
Computer Sci
Math Methods
Social Studies
Business & MGT
Econ Polit & Geography
Method from Rafols, Porter and Leydesdorff (2009)
Global Map of Science, 2010 update
224 Web of Science Categories
4 Factors with VOSviewer
Bio logy and
Medicine
Environmental S&T
Psychology and
Social Sciences
Physical
Sciences
Global Map of Science, 2010 update
224 Web of Science Categories
4 Factors with VOSviewer
Bio logy and
Medicine
Environmental S&T
Psychology and
Social Sciences
Physical
Sciences
Global Map of Science, 2010 update
224 Web of Science Categories
6 Factors with VOSviewer
Bio logy and
Medicine
Environmental S&T
Psychology and
Social Issues
Social Sciences
Computer Sci &
Engineering
Physical
Sciences
Global Map of Science, 2010 update
224 Web of Science Categories
6 Factors with VOSviewer
Bio logy and
Medicine
Psychology and
Social Issues
Environmental S&T
Social Sciences
Physical
Sciences
Computer Sci &
Engineering
19 Factors'
Agri Sci
Biomed Sci
Business & MGT
Chemistry
Clinical Med
Psychological Sci
Computer Sci
Ecol Sci
Econ Polit & Geography
Environ Sci & Tech
Geosciences
Health & Social Issues
Infectious Diseases
Materials Sci
Math Methods
Mech Eng
Physics
Clinical Psychology
Social Studies
19 factors 6 Factors
17 Biology and Medicine
1 Computer Sci. and Engineering
14 Environmental S&T
16 Physical S&T
5 Psychology and Social Issues
9 Social Sciences
3
6
4
13
7
10
15
2
19
12
18
8
11
6 factors 4 clusters
1 Biology and Medicine
6 Environmental S&T
3 Physical Science and Engineering
2 Psychology and Social Sciences
4
5
4 clusters
1
4
2
3
Examples
Based on 2007 Global Science Map
Global Map of Science
221 Web of Science Categories
18 Factors
Agri Sci
Ecol Sci
Geosciences
Infectious
Diseases
Env Sci & Tech
Clinical Med
Chemistry
Matls Sci
Biomed Sci
Engineering
Psychological Sci.
Health & Social Issues
Clinical
Psychology
Physics
Business & MGT
Computer Sci
Social Studies
Econ Polit. & Geography
Rafols, Porter and Leydesdorff (2009)
U. Amsterdam
EMBL
Georgia Tech
LSE
Pfizer
Unilever
Nestlé
Shell
NIH
BBSRC
NSF
EPSRC
References
Subject Category-based Science Maps
• Leydesdorff, L. and Rafols, I. (2009) A Global Map of Science Based on the ISI
Subject Categories. Journal of the American Society for Information Science and
Technology, 60(2), 348-362.
•
Rafols, I. and Leydesdorff, L. (2009). Content-based and Algorithmic Classifications
of Journals: Perspectives on the Dynamics of Scientific Communication and Indexer
Effects. Journal of the American Society for Information Science and Technology,
60(9), 1823-1835.
Overlay
• Rafols, I. and Meyer, M. (2010) Diversity and Network Coherence as indicators of
interdisciplinarity: case studies in bionanoscience. Scientometrics, 82(2), 263-287.
•
Rafols, I., Porter, A.L. and Leydesdorff, L. (2010) Science overlay maps: A new tool
for research policy and library management. Journal of the American Society for
Information Science and Technology 61(9), 871–1887.