The output of this graph is used as Figure 1 of the paper: Wangyan Li, Zidong Wang, Guoliang Wei, Lifeng Ma, Jun Hu, and Derui Ding, “A Survey on Multisensor Fusion and Consensus Filtering for Sensor Networks,” Discrete Dynamics in Nature and Society, vol. 2015, Article ID 683701, 12 pages, 2015. doi:10.1155/2015/683701.
It's based on http://www.texample.net/tikz/examples/hierarchical-diagram/.
Relevant link: http://tex.stackexchange.com/questions/226461/how-to-draw-hierarchical-graph-like-this-one.
LaTeX isn't just for reports and papers - the powerful TikZ package can be used to create professional graphics and diagrams with only a few lines of text
Here's the perfect example from TeXample.net that's pre-loaded in writeLaTeX for you to try out - just click to open & edit online instantly.
For comments and discussions on this example, see the TeXample page.
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