Barry Kronenfeld Cartograms

Transcript

1. Where the
   People Are
   Barry  J  Kronenfeld
   Eastern  Illinois  University
   

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2. Population Cartograms Barry J Kronenfeld
   Motivation 1: Aesthetics
   “...general readers often find all forms
   of cartograms equally obscure,
   strange and difficult to follow.” -
   Manting Tao (2010)
   

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3. Population Cartograms Barry J Kronenfeld
   A catalog of monsters?
   

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4. Population Cartograms Barry J Kronenfeld
   Cartograms of a different era
   

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5. Population Cartograms Barry J Kronenfeld
   

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6. Population Cartograms Barry J Kronenfeld
   Motivation 2: Error Distribution
   USA
   1.07x  too  large  
   West  Bank/Gaza  Strip
   3.22x  too  small  
   Singapore
   1.93x  too  small  
   India
   1.02x  too  small  
   

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7. Population Cartograms Barry J Kronenfeld
   Motivation 2: Error Distribution
   Benjamin  Hennig  on  the  World  Population  Atlas
   hGp://www.viewsoftheworld.net/?p=832
   possible  
   error  
   source??
   

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8. Population Cartograms Barry J Kronenfeld
   Objectives
   1.  Create  software  for  manual  cartogram  
   construction
   2.  Manually  construct  USA  states  cartogram
   3.  Assess:
   r  accuracy
   r  aesthetics
   r  feasibility
   
   

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9. 1. Software Environment
   for Manual Cartogram
   Construction
   

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10. Population Cartograms Barry J Kronenfeld
    Cartogram Studio
    

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11. Population Cartograms Barry J Kronenfeld
    Grid Transformation Framework
    source  grid   target  grid
    

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12. Population Cartograms Barry J Kronenfeld
    Adjust Target Grid
    World  Population  
    Atlas
    

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13. Population Cartograms Barry J Kronenfeld
    Adjust Target Grid
    

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14. Population Cartograms Barry J Kronenfeld
    Adjust Source Grid
    

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15. Population Cartograms Barry J Kronenfeld
    Adjust Source Grid
    

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16. Population Cartograms Barry J Kronenfeld
    Dot-Density Metaphor
    1  dot  =  5  million  
    people  
    

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17. Population Cartograms Barry J Kronenfeld
    Adjustment Tools
    q  Rectangle  Transform  Tool
    q  Line  Transform  Tool
    q  Smudge  Tool
    

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18. Population Cartograms Barry J Kronenfeld
    Rectangle Transform Tool
    

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19. Population Cartograms Barry J Kronenfeld
    Rectangle Transform Tool
    

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20. Population Cartograms Barry J Kronenfeld
    Line Transform Tool
    

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21. Population Cartograms Barry J Kronenfeld
    Line Transform Tool
    

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22. Population Cartograms Barry J Kronenfeld
    Smudge Tool
    

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23. Population Cartograms Barry J Kronenfeld
    Smudge Tool
    

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24. 2. USA States
    Population
    Cartogram
    

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25. Population Cartograms Barry J Kronenfeld
    Construction Process
    

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26. Population Cartograms Barry J Kronenfeld
    Construction Process
    

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27. Population Cartograms Barry J Kronenfeld
    USA States Population Cartogram
    (final)
    

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28. Population Cartograms Barry J Kronenfeld
    Source Grid as Dot-Density Map
    

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29. 3. Assessment
    

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30. Population Cartograms Barry J Kronenfeld
    3a. Accuracy Assessment
    20% 30% 50%
    15% 45% 40%
    POPULATION:
    SIZE:
    APPORTIONMENT  
    ERROR:
    5% 10%
    + = 15%
    

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31. Population Cartograms Barry J Kronenfeld
    Error Comparison
    SCAPETOAD  
    0.52%  APPORTIONMENT  ERROR
    CARTOGRAM  STUDIO
    0.22%  APPORTIONMENT  ERROR
    

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32. Population Cartograms Barry J Kronenfeld
    Error Comparison
    

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33. Population Cartograms Barry J Kronenfeld
    3b) Aesthetic Assessment
    SCAPETOAD  
    (DIFFUSION  ALGORITHM)
    CARTOGRAM  STUDIO
    (MANUAL  CONSTRUCTION)
    

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34. Population Cartograms Barry J Kronenfeld
    Alabama
    

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35. Population Cartograms Barry J Kronenfeld
    West Virginia
    

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36. Population Cartograms Barry J Kronenfeld
    Wyoming
    

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37. Population Cartograms Barry J Kronenfeld
    Oklahoma
    

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38. Population Cartograms Barry J Kronenfeld
    OK, but what about regions without straight
    borders?
    

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39. Population Cartograms Barry J Kronenfeld
    Decide for yourself...
    SCAPETOAD CARTOGRAM  STUDIO
    

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40. Population Cartograms Barry J Kronenfeld
    3c. Feasibility
    q  Work  in  Progress
    r  personal  results
    r  classroom  experience
    

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41. Population Cartograms Barry J Kronenfeld
    Conclusions
    q  accuracy  !
    r  easy  to  handle  small,  high  density  regions
    q  aesthetics  !
    r  possible  to  preserve  straight  lines
    q  feasibility  !*
    r  proof-­‐‑of-­‐‑concept  demonstrated
    q  Future  Work:
    r  User  Testing  &  Distribution
    

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42. Population Cartograms Barry J Kronenfeld
    USA Cartogram & Cartogram Transform tool
    available on my website
    hQp://ux1.eiu.edu/~bjkronenfeld/
    

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43. Population Cartograms Barry J Kronenfeld
    Cartogram Transform (ArcGIS Tool)
    Cartogram as Projection
    

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44. Population Cartograms Barry J Kronenfeld
    Mississippi & Columbia Rivers
    

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45. Population Cartograms Barry J Kronenfeld
    Acknowledgements
    q  EIU  Council  on  Faculty  Research  (CFR)  
    Grant
    q  Software  built  on  Dot  Spatial
    

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46. Population Cartograms Barry J Kronenfeld
    Questions?
    

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