Navigating Hierarchies with Structure-Based
Ying-Huey Fua, Matthew O. Ward and Elke A. Rundensteiner
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.
Brushing, hierarchical representation, interactive selection,exploratory
on Information Visualization, Oct. 1999.