  Journal maps and classifications for 11,359 journals listed in the combined
Journal Citation Reports 2015 of the Science and Social Sciences Citation
Indexes are provided at http://www.leydesdorff.net/jcr15. A routine using
VOSviewer for integrating the journal mapping and their hierarchical clustering
is also made available. In this short communication, we provide background on
the journal mapping/clustering and an explanation and instructions about the
routine. We compare 2015 journal maps with those for 2014 and show the
delineations among fields and subfields to be sensitive to fluctuations. Labels
for fields and sub-fields are not provided by the routine, but can be added by
an analyst for pragmatic or intellectual reasons. The routine provides a means
for testing one's assumptions against a baseline without claiming authority,
clusters of related journals can be visualized to understand communities. The
routine is generic and can be used for any 1-mode network.
