Automation in the Overlaying of Journal Maps

Ismael Rafols (personal communication) suggested to me in 2008 to use journal maps as a background for portfolio analysis and visualization. Such a tool could be used for informing science & technology policy debates (Leydesdorff & Rafols, 2009; Rafols & Leydesdorff, 2010). I had developed journal maps since the mid-1990s on the basis of aggregated journal-journal citations as these are yearly collected and published in the Journal Citation Reports (JCR) of the Science Citation Index and the Social Sciences Citation Index by ISI/Clarivate™. However, my focus had been on developing structural (Leydesdorff, 1986, 1987) and dynamic (Leydesdorff & Schank, 2008) analysis of the sciences. Portfolio analysis provides another option: the journal structure is then assumed as a baseline. In this report, I propose a tool that automates the visualization of portfolios (see at http://www.leydesdorff.net/wc19 ).