Hierarchical Edge Bundles: Visualization of Adjacency Relations in Hierarchical Data
Holten, D.
Technische Univ. Eindhoven;
This paper appears in: Visualization and Computer Graphics, IEEE Transactions on
Publication Date: Sept.-Oct. 2006
Volume: 12,
Issue: 5
On page(s): 741-748
Location: Research Triangle Park, NC, USA,
ISSN: 1077-2626
INSPEC Accession Number: 9233812
Digital Object Identifier: 10.1109/TVCG.2006.147
Current Version Published: 2006-11-20
Abstract
A compound graph is a frequently encountered type of data set. Relations are given between items, and a hierarchy is defined on the items as well. We present a new method for visualizing such compound graphs. Our approach is based on visually bundling the adjacency edges, i.e., non-hierarchical edges, together. We realize this as follows. We assume that the hierarchy is shown via a standard tree visualization method. Next, we bend each adjacency edge, modeled as a B-spline curve, toward the polyline defined by the path via the inclusion edges from one node to another. This hierarchical bundling reduces visual clutter and also visualizes implicit adjacency edges between parent nodes that are the result of explicit adjacency edges between their respective child nodes. Furthermore, hierarchical edge bundling is a generic method which can be used in conjunction with existing tree visualization techniques. We illustrate our technique by providing example visualizations and discuss the results based on an informal evaluation provided by potential users of such visualizations
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