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Vis2: Interactive Visual Comparison of Multiple Trees

Florian Spechtenhauser 0826226, Christian Möllinger 0725979 / show help
Comparison Overview
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Score Distribution View
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Consensus Tree View
One does not simply use HTML5 Canvas with this browser
not simply use HTML5 Canvas with this browser

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1. The Views

1.1 Comparison Overview

An overview of pairwise similarities of all trees in the test data set is presented by the similarity matrix. Every row/column represents one tree. The cells encode the global similarity evaluation of tree pairs. This view allows for an overview of global similarities among trees and thereby offers the possibility to select a reference tree for more detailed 1:n tree comparison in other views. The reference tree is selected by clicking on a column. If a new reference tree is selected, all measures are recalculated and the views are updated.
The selected reference tree is highlighted with a black border, while currently compared trees are highlighted with a red border.

Score Distribution Overview

The Score Distribution Overview provides a compact overview of the score distribution of all nodes in each tree when compared to the selected reference tree. Clicking on a histogram opens/closes the detailed Tree Comparison View for the selected tree (compared against the selected reference tree). Trees which are currently viewed in the Tree Comparison View are highlighted with a red border.

1.2 Consensus Tree View

The Consensus Tree View shows the selected reference tree and provides a compact form of a comparison between the reference tree and all other trees. Each displayed score is the average of the scores comparing the reference tree node against its best matching unit in all other trees.
In The Consensus Tree View, tree nodes can be selected by clicking on it. If a node is selected, the matching nodes and leaves in all open Tree Comparison Views are highlighted with a purple color.

1.3 Tree Comparison Views

The tree comparison view is the most detailed view presented in the paper, and it contains the comparison tree scored against the selected reference tree. Nodes which have a score below the user-defined threshold are automatically collapsed, but the user can manually collapse/open nodes by clicking on it. Collapsed nodes are represented by a green square.

2. How to use the program

  1. Select the measure which you want to use to calculate the similarity scores and set the threshold for automatic node collapsing
  2. Use the Comparison Overview to get an overview of the loaded trees and their similarity
  3. Select a reference tree by clicking on a column in the Comparison Overview
  4. Use the Score Distribution Overview to get an overview of the scores of the other trees compared to the reference tree
  5. Open detailed Tree Comparison Views by clicking on the histograms in the Score Distribution Overview
  6. Feel free to select nodes in the Consensus Tree View, which then will get highlighted in the open Tree Comparison Views

3. Notes

The application is optimized for a resolution with at least 1280x800 pixels and should be used in fullscreen.

4. References

S. Bremm, T. Landesberger, M. Heß, T. Schreck, Ph. Weil, K. Hamacher. Interactive visual comparison of multiple trees. IEEE Computer Society, Technical Committee on Visualization and Graphics: IEEE Conference on Visual Analytics Science and Technology, VAST 2011. Proceedings : 23-28 October 2011