• History Flow. F.B. Viégas, M. Wattenberg and K. Dave [29]
present history flow as a visualization technique designed
to show the evolution of a document efficiently with
respect to the contributions of its different authors. The
horizontal axis of a history flow carries time and the
vertical axis the names of the authors. A color code is
assigned to each author and the vertical length of a bar
indicates the amount of text written by each author.
• Spatial information flow. It is another visualization
technique that represents spatial information flows. It
is mostly represented as a lighting graph where edges
connect sites located on a map.
Visualization can also be used to solve Big Data problems.
For a brief review on this topic, see [30].