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Sankey Arcs - Visualizing edge weights in path graphs

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Presentation at EuroVis 2012, Vienna, Austria

Presentation at EuroVis 2012, Vienna, Austria

Published in: Design, Technology, Education

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  • 1. Sankey Arcs – Visualizingedge weights in path graphsTill Nagel, Erik Duval, Andrew Vande Moere, Kristian Kloeckl and Carlo Ratti
  • 2. Arc diagrams
  • 3. Arc diagrams
  • 4. Arc diagrams
  • 5. Wattenberg, 2002 Steinweber and Koller, 2007Heer et al, 2010 Kerr, 2003Dörk et al, 2011 Wattenberg, 2006
  • 6. Design goals•  Display node strength independent of edge distribution•  Enable comparison of in-weight and out- weight•  Emphasize total weight of a node
  • 7. Spreading out impostsClassic Arcs Sankey Arcs
  • 8. AlgorithmClassic arc diagram Spread out arc bases Reordered head and tail positions
  • 9. Color coding for direction
  • 10. Color coding for direction
  • 11. Limitations•  Consumes more space•  Arc height does not always encode distance
  • 12. Arc height does not always encode distance
  • 13. Consumes more space
  • 14. Consumes more spaceSolution a)Adapt node positioningEqui-distant nodes Equi-sized gaps
  • 15. Consumes more spaceSolution b)Modify visual encoding
  • 16. Scalability Heer et al, 2010 Showing character relationships of the novel Les Misérables.
  • 17. Scalability Reproduction Removed color (encoded character groups). Fixed edge width. Improved label display.
  • 18. Sankey Arcs: Repositioned nodes
  • 19. Sankey Arcs: Adjusted visual mapping
  • 20. Case study: Public transit rides
  • 21. Ridership Visualization
  • 22. Sankey Arcs•  Display edge weights in path graph•  Have less visual obstruction by spreading out arcs•  Allow comparing strength, and in- and out- weights of nodes
  • 23. Thank you. Questions?Sankey Arcs, EuroVis 2012 Till Nagel, FH Potsdam, 06/2012 nagel@fh-potsdam.de – twitter: @tillnm