Dr. rer. nat. Dipl.-Inform. Michael Burch
Email: michael.burch@visus.uni-stuttgart.de


VISUS - Institut für Visualisierung und Interaktive Systeme - Stuttgart

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Trees in a Treemap: Visualizing Multiple Hierarchies

Paper pdf-Version
Traceroutes shown in an IP hierarchy

Traceroutes shown in an IP hierarchy

A list of sequences of elements can be represented by a prefix tree exploiting similar or equal prefixes and subprefixes of each single sequence in the list. If each element in a sequence also belongs to some part of a hierarchy, i.e. all elements contained in all sequences can be hierarchically organized, a Trees in a Treemap representation can be used to visualize this kind of data.

A sophisticated layout algorithm produces the Trees in a Treemap by following several parameters: edge lengths, number of edge bends, and distances between neighbored routes. The layout algorithm has a high runtime complexity when allowing more than three edge bends for one sequence and when routes become very long. The layout algorithm tries to find a layout where as little route crossings as possible are produced.

If you are interested in the Trees in a Treemap approach please read our paper that we presented at the Conference on Visualization and Data Analysis in San Jose, California in 2006 or write an email.