101 vi visu sual aliz izat atio ion
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101 - Vi Visu sual aliz izat atio ion Vis is10 Lecture 6: - PowerPoint PPT Presentation

101 - Vi Visu sual aliz izat atio ion Vis is10 Lecture 6: The Visualization Alphabet: Marks and Channels This Week Homework 1! Lecture 5: Lecture 6: Section 2: Reading: No Device Policy Last Week Terms Dataset Types Data Types


  1. 101 - Vi Visu sual aliz izat atio ion Vis is10 Lecture 6: The Visualization Alphabet: Marks and Channels

  2. This Week Homework 1! Lecture 5: Lecture 6: Section 2: Reading:

  3. No Device Policy

  4. Last Week

  5. Terms Dataset Types Data Types

  6. Tables Attributes Flat Table Keys Values Item Multidimensional Table

  7. Multidimensional Tables Keys: Patients Keys: Genes z

  8. Graphs/Networks

  9. Fields Attribute values associated with cells Cell contains data from continuous domain Measured or simulated Sampling & Interpolation

  10. Other Collections Sets Lists Clusters

  11. Data Types Nominal (labels) Ordinal (ordered) Interval (location of zero arbitrary) Ratio (zero fixed) On the theory of scales and measurements [S. Stevens, 46]

  12. Item/Element/ (Independent) Variable

  13. Attribute/ Dimension/ (Dependent) Variable/ Feature

  14. Semantics

  15. Keys?

  16. Attribute Types?

  17. Categorical Ordinal Quantitative

  18. Design Critique

  19. Recalled Cars NY Times http://goo.gl/tDVISB

  20. The Visualization Alphabet: Marks and Channels

  21. Marks & Channels

  22. Example: Homework 2

  23. Marks for Items

  24. Marks for Links

  25. Containment can be nested

  26. Channels (aka Visual Variables)

  27. Jacques Bertin

  28. Bertin’s Visual Variables

  29. Using Marks and Channels

  30. Redundant encoding

  31. Good bar chart?

  32. Types of Channels

  33. Channels: Expressiveness Types and Effectiveness Ranks

  34. What visual variables are used?

  35. What visual variables are used?

  36. Characteristics of Channels Selective Associative Quantitative (Magnitude vs Identity Channels)

  37. Characteristics of Channels Order (Magnitude vs Identity) Length

  38. Position Strongest visual variable Suitable for all data types Problems:

  39. Example: Scatterplot

  40. Position in 3D?

  41. Length & Size Good for 1D, OK for 2D, Bad for 3D Easy to see whether one is bigger Aligned bars use position redundantly

  42. Example 2D Size: Bubbles

  43. Value/Luminance/Saturation OK for quantitative data when length & size are used. Not very many shades recognizable

  44. Example: Diverging Value-Scale

  45. Color Good for qualitative data (identity channel) Limited number of classes/length (~7-10!) Does not work for quantitative data! Lots of pitfalls! Be careful! Suggested rule:

  46. Color: Bad Example

  47. Color: Good Example

  48. Shape Great to recognize many classes. No grouping, ordering.

  49. Chernoff Faces Idea: use facial parameters to map quantitative data

  50. More Channels

  51. Why are quantitative channels different?

  52. Steven’s Power Law, 1961

  53. How much longer?

  54. How much longer?

  55. How much steeper?

  56. How much larger (area)?

  57. How much larger (area)?

  58. How much larger (diameter)?

  59. How much darker?

  60. Position, Length & Angle

  61. Other Factors Affecting Accuracy

  62. Cleveland / McGill, 1984

  63. Heer & Bostock, 2010

  64. Jock Mackinlay, 1986

  65. Channels: Expressiveness Types and Effectiveness Ranks

  66. Next Week Lecture 7: Lecture 8: Section 3: Homework 1 due to Friday, 30 October.

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