Hierarchical Data Visualization. Ai Nakatani IAT 814 February 21, 2007

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1 Hierarchical Data Visualization Ai Nakatani IAT 814 February 21, 2007

2

3 Introduction Hierarchical Data Directory structure Genealogy trees Biological taxonomy Business structure Project structure Challenges Visualization of large data Dynamic hierarchy Searching and filtering

4 Visualization Techniques Extending the Usability of Treemaps with Flexible Hierarchy, G. Chintalapani, C. Plaisant and B. Shneiderman, Proc. IV 04. SpaceTree: Supporting Exploration in Large Node Link Tree, Design Evolution and Empirical Evaluation, C. Plaisant, J. Grosjean and B. Bederson, Proc. InfoVis 02.

5 Treemap Space-filling method of visualizing large hierarchical data sets Usually visualize two dimensional dataset One mapped to the area of the rectangles The other mapped to the color of the rectangles

6 Treemap Basic Layouts Slice-and-dice Cluster Squarified Strip Extended strip layout

7 Treemap Features Three layout options User specification of the hierarchy Aggregation Dealing with imposed variable depth hierarchy Dynamic queries and filter

8 Treemap Example Project Structure Visualization

9 SpaceTree Builds on the conventional node link tree diagrams Combined with a zooming environment that dynamically lays out branches of the tree to best fit the available screen space

10 SpaceTree Example Animal Taxonomy Visualization

11 SpaceTree Features Several layout options Branches that do not fit on the screen are summarized by triangles Shading: Total number of nodes in the subtree Height: Depth of the subtree Base: Average width (i.e. number of items/depth)

12 SpaceTree Features Progressive opening of branches by clicking on a node Maximizing the number of levels opened at any time Decomposed tree animation: trim, translate, and grow Dynamic queries and filtering

13 Comparison Treemap 1. Flexible hierarchy 2. Single screen visualization of large data 3. Size and color coding of attributes 4. Unclear hierarchical structure 5. Unconventional tree representation 6. Require user training SpaceTree 1. Fixed hierarchy 2. Progressive visualization 3. Attributes can only be labeled 4. Obviously visible hierarchy 5. Regular node-edges tree representation 6. More intuitive to user

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