science overlay maps; update 2009

[Loet Leydesdorff]

Dear colleagues, 

 

In collaboration with Alice O'Hare and Ismael Rafols at SPRU (University of
Sussex), a new version of the science overlay maps 2009 is now available at
http://www.leydesdorff.net/overlaytoolkit/index.htm . The overlay map is
updated since the previous one of 2007. The latter was based on the
citations among 7,940 journals organized in 221 Subject Categories. The new
map is based on citation relations among 9,162 journals organized in 222
Subject Categories (in the JCR 2009). 

 

The overlay map enables the user to visualize the (inter-)disciplinary
configuration of a document set retreived from the Science Science Indices.
See for more details: Ismael Rafols, Alan Porter & Loet Leydesdorff, Science
overlay maps: a new tool for research policy and library management
<http://www.leydesdorff.net/overlaytoolkit/overlaytoolkit.htm> , Journal of
the American Society for Information Science & Technology 61(9) (2010)
1871-1887; <pdf-version
<http://www.leydesdorff.net/overlaytoolkit/overlaytoolkit.pdf> > <software
and manual <http://www.leydesdorff.net/overlaytoolkit> >. An interactive
version is also available at http://www.idr.gatech.edu/upload.php  (Georgia
Tech) and will be updated shortly. The files for 2007 and 2008 remain
available from my website. 

 

Two further extensions are now also available: 

 

1. Extension for GEPHI

Clement Levallois < CLevallois at rsm.nl > was so kind to make an excel file
with a macro <http://www.leydesdorff.net/overlaytoolkit/gephi.xlsm>
<gephi.xlsm> which allows for generating the corresponding input file for
GEPHI <http://gephi.org/>  (as an alternative to Pajek for the
visualization). Save this file under the name gephi.xlsm by right clicking
on the hyperlink.

 

2. Rao-Stirling Diversity

Both procedures (ISI.Exe or SC2009.Exe) also provide a file sc09.dbf. This
file can be used as input to the computation of the Stirling-Rao diversity
measure using the instruction provided here
<http://www.leydesdorff.net/overlaytoolkit/stirling.htm> . (See for
definitions: Loet Leydesdorff & Ismael Rafols, Indicators of the
Interdisciplinarity of Journals: Diversity, Centrality, and Citations
<http://www.leydesdorff.net/interdisc/index.htm> , Journal of Informetrics
(forthcoming); <pdf version
<http://www.leydesdorff.net/interdisc/interdisc.pdf> >.)

 

Finally, the updated baseline maps (for the projection) are available for
PowerPoint in the file Global maps.ppt
<http://www.leydesdorff.net/overlaytoolkit/global%20maps.ppt> .

 

With best wishes, 

Loet

 

** apologies for cross-postings

  _____  

Loet Leydesdorff 

Professor, University of Amsterdam
Amsterdam School of Communications Research (ASCoR)
Kloveniersburgwal 48, 1012 CX Amsterdam.
Tel. +31-20-525 6598; fax: +31-842239111

 <mailto:loet at leydesdorff.net> loet at leydesdorff.net ;
<http://www.leydesdorff.net/> http://www.leydesdorff.net/ 
Visiting Professor 2007-2010,  <http://www.istic.ac.cn/Eng/brief_en.html>
ISTIC, Beijing; Honorary Fellow 2007-2010,  <http://www.sussex.ac.uk/spru/>
SPRU, University of Sussex 



 

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