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Seeing Graphs - How to successfully visualize connected data

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How to visualize graphs. Learn how to

How to visualize graphs. Learn how to

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  • 1. Joe Parry Seeing Graphs How to successfully visualize connected data
  • 2. Agenda • The graph design process • Interaction models • Why animate? • Strategies for visualizing larger networks • A reference architecture
  • 3. GRAPH MODELLING + Data Visualisation = Graph Visualisation
  • 4. Why use the graph data model? Data models are generally interchangeable, but each have their own strengths in certain. The graph data model is good for…
  • 5. • Social interactions • Dependency management • Organizational structures • Connectivity of systems • Biological processes • Financial transactions • Communications • http://keylines.com/why
  • 6. Good in what sense? Graph models answer questions: • what depends on what • how do things flow • where are the risks • impact analysis
  • 7. A quick clarification… In any data, there is not ‘one graph’. Any single data set can be modelled in many different ways: Perhaps more suitable for understanding social networks? Probably a more accurate picture of how email sending works
  • 8. Graph Modelling + DATA VISUALISATION = Graph Visualisation
  • 9. Data is invisible To be seen, data must be VISUALLY ENCODED
  • 10. There are many different options for encoding data We need to understand which works best for our audience Fortunately, people have already researched the most accurate encoding methods…
  • 11. Quantitative Ordinal Nominal More Accurate Less Accurate Quantitative Ordinal Nominal Position Position Position Length Density Hue Angle Saturation Density Slope Hue Saturation Area Length Shape Density Angle Length Saturation Slope Angle Hue Area Slope Shape Shape Area Visual encoding by data type
  • 12. Data visualisation is a DESIGN PROCESS
  • 13. Graph Modelling + Data Visualisation = GRAPH VISUALISATION
  • 14. There are several design options for graph visualisation
  • 15. Matrix • All nodes have a column & a row • A dot is put in the middle if a link exists • Good for finding clusters • But requires a lot of cross referencing to understand the details
  • 16. Edge bundling • Nodes are around the edge • Links between the nodes are bundled to show patterns • Detail can become spread out • Computationally difficult to create
  • 17. Hive plots Hive Plots • Nodes are grouped into categories • Links between nodes are added • This can help display huge networks with a lessened ‘hairball’ effect • But generally Hive Plots are less intuitive
  • 18. Classic node-link diagram • Intuitive • Easy to understand • The most ‘successful’ option for conveying data
  • 19. INTERACTIONS
  • 20. Why is interaction needed? • The user needs to drive their own focus • Allows the user to see details on demand • Allows the user to add or remove bits of the graph
  • 21. Interactions users expect • Zooming • Multiple node selection • Hover and tooltip events • Context menus • Gestures & tablet support • Expand on demand • Searching • Commands
  • 22. ANIMATION
  • 23. Why animate? • Users expect it • It provides smoother transitions: – eases context switching for users – Allows them to keep a mental model • Animations – can show data – can show dynamics
  • 24. STRATEGIES FOR LARGER NETWORKS
  • 25. Beyond a certain size, no automatic layout will help you decipher a graph Your options include:
  • 26. 1. Use color
  • 27. 2. Use filters
  • 28. 3. Allow users to expand
  • 29. 4. Link & Node aggregation
  • 30. REFERENCE ARCHITECTURE
  • 31. Graph Database Neo4j Web Server Reference Architecture Document Store Search Index User Authentication (eg Active Directory) Chart Store http://keylines.com/architecture
  • 32. Cambridge Intelligence Start-up, founded May 2011 We make network visualisation tools (big data projects, fraud, security services)
  • 33. All demos made with info@keylines.com Questions? Contact Information

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