Map of Knowledge
Previous maps of the relationship between branches of modern science were done by mapping the citations among journal articles. These citations are footnotes referencing previous articles on the same or related subjects. Citations are the equivalent links in a posting. They take you to the source. Citation indexes tally these links by subject. Mapping software can display the patterns of links. One example is below:
A map of linkage.
A new way of mapping these intra-science relationships has just been published. Instead of mapping links, this new method maps clicks. The program reads the logs of the servers offering online journals (the most popular way to get articles today) and records the clickstream of a researcher as they hop from one article to the next.
