Title: Navigating Hierarchies with Structure-Based

Authors: Ying-Huey Fua, Matthew O. Ward and Elke A. Rundensteiner

Abstract: Interactive selection is a critical component in exploratory visualization, allowing users to isolate subsets of the displayed information for highlighting, deleting, analysis, or focussed investigation. Brushing, a popular method for implementing the selection process, has traditionally been performed in either screen space or data space. In this paper, we introduce the concept of a structure-based brush, which can be used to perform selection in hierarchically structured data sets. Our structure-based brush allows users to navigate hierarchies by specifying focal extents and level-of-detail on a visual representation of the structure. Proximity-based coloring, which maps similar colors to data that are closely related within the structure, helps convey both structural relationships and anomalies.We describe the design and implementation of our structure-based brushing tool. We also validate its usefulness using two distinct hierarchical visualization techniques, namely hierarchical parallel coordinates and tree-maps.

Keywords: Brushing, hierarchical representation, interactive selection,exploratory data analysis.

Source: IEEE Symposium on Information Visualization, Oct. 1999.