Meaningful change detection in structured data
SIGMOD '97 Proceedings of the 1997 ACM SIGMOD international conference on Management of data
Hierarchical visualization with treemaps: making sense of pro basketball data
CHI '94 Conference Companion on Human Factors in Computing Systems
PhotoMesa: a zoomable image browser using quantum treemaps and bubblemaps
Proceedings of the 14th annual ACM symposium on User interface software and technology
Ordered and quantum treemaps: Making effective use of 2D space to display hierarchies
ACM Transactions on Graphics (TOG)
Cushion Treemaps: Visualization of Hierarchical Information
INFOVIS '99 Proceedings of the 1999 IEEE Symposium on Information Visualization
TreeJuxtaposer: scalable tree comparison using Focus+Context with guaranteed visibility
ACM SIGGRAPH 2003 Papers
Tree-Maps: a space-filling approach to the visualization of hierarchical information structures
VIS '91 Proceedings of the 2nd conference on Visualization '91
A survey on tree edit distance and related problems
Theoretical Computer Science
A Note on Space-Filling Visualizations and Space-Filling Curves
INFOVIS '05 Proceedings of the Proceedings of the 2005 IEEE Symposium on Information Visualization
Visualizing Business Data with Generalized Treemaps
IEEE Transactions on Visualization and Computer Graphics
Improving Window Switching Interfaces
INTERACT '09 Proceedings of the 12th IFIP TC 13 International Conference on Human-Computer Interaction: Part II
Improved window switching interfaces
CHI '10 Extended Abstracts on Human Factors in Computing Systems
Proceedings of the 2010 ACM Symposium on Applied Computing
Visual analysis of dynamic data streams
Information Visualization
A survey of multiple tree visualisation
Information Visualization
Supporting window switching with spatially consistent thumbnail zones: design and evaluation
INTERACT'11 Proceedings of the 13th IFIP TC 13 international conference on Human-computer interaction - Volume Part I
Visual comparison for information visualization
Information Visualization - Special issue on State of the Field and New Research Directions
Diagrams'12 Proceedings of the 7th international conference on Diagrammatic Representation and Inference
Visual comparison of hierarchically organized data
EuroVis'08 Proceedings of the 10th Joint Eurographics / IEEE - VGTC conference on Visualization
Visualization techniques for schedule comparison
EuroVis'09 Proceedings of the 11th Eurographics / IEEE - VGTC conference on Visualization
Comparison of multiple weighted hierarchies: visual analytics for microbe community profiling
EuroVis'11 Proceedings of the 13th Eurographics / IEEE - VGTC conference on Visualization
Change-link 2.0: a digital forensic tool for visualizing changes to shadow volume data
Proceedings of the Tenth Workshop on Visualization for Cyber Security
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While the treemap is a popular method for visualizing hierarchical data, it is often difficult for users to track layout and attribute changes when the data evolve over time. When viewing the treemaps side by side or back and forth, there exist several problems that can prevent viewers from performing effective comparisons. Those problems include abrupt layout changes, a lack of prominent visual patterns to represent layouts, and a lack of direct contrast to highlight differences. In this paper, we present strategies to visualize changes of hierarchical data using treemaps. A new treemap layout algorithm is presented to reduce abrupt layout changes and produce consistent visual patterns. Techniques are proposed to effectively visualize the difference and contrast between two treemap snapshots in terms of the map items脗隆脗炉 colors, sizes, and positions. Experimental data show that our algorithm can achieve a good balance in maintaining a treemap脗隆脗炉s stability, continuity, readability, and average aspect ratio. A software tool is created to compare treemaps and generate the visualizations. User studies show that the users can better understand the changes in the hierarchy and layout, and more quickly notice the color and size differences using our method.