Barry Kronenfeld Cartograms

Transcript

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

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)

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

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

5. Population Cartograms Barry J Kronenfeld

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  

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??

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

9. 1. Software Environment for Manual Cartogram Construction

10. Population Cartograms Barry J Kronenfeld Cartogram Studio

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

      target  grid

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

      Atlas

13. Population Cartograms Barry J Kronenfeld Adjust Target Grid

14. Population Cartograms Barry J Kronenfeld Adjust Source Grid

15. Population Cartograms Barry J Kronenfeld Adjust Source Grid

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

     5  million   people  

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

     Tool q  Line  Transform  Tool q  Smudge  Tool

18. Population Cartograms Barry J Kronenfeld Rectangle Transform Tool

19. Population Cartograms Barry J Kronenfeld Rectangle Transform Tool

20. Population Cartograms Barry J Kronenfeld Line Transform Tool

21. Population Cartograms Barry J Kronenfeld Line Transform Tool

22. Population Cartograms Barry J Kronenfeld Smudge Tool

23. Population Cartograms Barry J Kronenfeld Smudge Tool

24. 2. USA States Population Cartogram

25. Population Cartograms Barry J Kronenfeld Construction Process

26. Population Cartograms Barry J Kronenfeld Construction Process

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

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

29. 3. Assessment

30. Population Cartograms Barry J Kronenfeld 3a. Accuracy Assessment 20% 30%

    50% 15% 45% 40% POPULATION: SIZE: APPORTIONMENT   ERROR: 5% 10% + = 15%

31. Population Cartograms Barry J Kronenfeld Error Comparison SCAPETOAD   0.52%

     APPORTIONMENT  ERROR CARTOGRAM  STUDIO 0.22%  APPORTIONMENT  ERROR

32. Population Cartograms Barry J Kronenfeld Error Comparison

33. Population Cartograms Barry J Kronenfeld 3b) Aesthetic Assessment SCAPETOAD  

    (DIFFUSION  ALGORITHM) CARTOGRAM  STUDIO (MANUAL  CONSTRUCTION)

34. Population Cartograms Barry J Kronenfeld Alabama

35. Population Cartograms Barry J Kronenfeld West Virginia

36. Population Cartograms Barry J Kronenfeld Wyoming

37. Population Cartograms Barry J Kronenfeld Oklahoma

38. Population Cartograms Barry J Kronenfeld OK, but what about regions

    without straight borders?

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

     STUDIO

40. Population Cartograms Barry J Kronenfeld 3c. Feasibility q  Work  in

     Progress r  personal  results r  classroom  experience

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

42. Population Cartograms Barry J Kronenfeld USA Cartogram & Cartogram Transform

    tool available on my website hQp://ux1.eiu.edu/~bjkronenfeld/

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

    as Projection

44. Population Cartograms Barry J Kronenfeld Mississippi & Columbia Rivers

45. Population Cartograms Barry J Kronenfeld Acknowledgements q  EIU  Council  on

     Faculty  Research  (CFR)   Grant q  Software  built  on  Dot  Spatial

46. Population Cartograms Barry J Kronenfeld Questions?