This document provides an overview and summary of an information visualization lesson. It discusses topics covered in the previous lesson such as D3.js and creating blog posts. Guidelines for data visualization best practices are presented, including an overview of perceptual abilities and limitations of humans. Common mantras and techniques like overview first, zoom and filter, and details-on-demand are covered. The document concludes with an exercise to visualize a small dataset and assigning a practical project to create an interactive visualization.

1. Informatie visualisatie:
Les 2
Joris Klerkx - Erik Duval
http://hci.cs.kuleuven.be
joris.klerkx@cs.kuleuven.be
Human-Computer Interaction
Dept. Computerwetenschappen
KU Leuven
1

2. Opdracht vorige week
• Individueel:
• d3.js aanleren
• d3.js van spreadsheet als simpele case study
• kort presenteren in volgende sessie
• Spreadsheet aanvullen
• Per team:
• blog opzetten en op slack aankondigen
• Wiki pagina aanvullen
• Infovis van de week posten op blog
• (digitaal/analoog, individueel)
2

3. Spreadsheet
15/02/2015 - 12u
3

4. Infovis vd week
VISUALEYESGROUP Joren Sigert Wander
The Tufters Yannick B Yannick L Yves
InfoFish Sus Vincent Maxim
Ex Machina Tom Wietse Eline
The Info Mob Glenn Carmen Birgit
Game of Simplicity Gert-Jan Sebastiaan Michael
Postgraduwhat Max Wouter Evert
INNOV8 Matteus Victor Jean-Baptise
15/02/2015 - 14u13
4

5. Leuke posts!
5

6. https://postgraduwhatblog.wordpress.com/2016/02/13/infovis-van-de-week-1-wouter/
Sterfgevallen in boeken - Game of Thrones
6

7. D3.js?
7

8. Guidelines & Facts
8

9. How many circles?
9

10. Humans have advanced perceptual abilities
Our brains makes us extremely good at recognizing visual patterns
10

11. 11
Humans have little short term memory
Our brain remembers relatively little of what we perceive.
https://www.youtube.com/watch?v=IGQmdoK_ZfY&gl=BE

12. http://dl.acm.org/citation.cfm?id=300679
12

13. Visual Information Seeking Mantra
https://www.youtube.com/watch?v=og7bzN0DhpI (9:51 - 11:22 )
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14. http://www.bbc.com/future/bespoke/20140724-flight-risk/
Overview first, zoom & filter, details-on-demand
14

15. http://infovis-lvm.github.io
Overview first, zoom & filter, details-on-demand
15

16. Real data is ugly and needs to be cleaned
http://hcil2.cs.umd.edu/trs/2011-34/2011-34.pdf
http://www.netmagazine.com/features/seven-dirty-secrets-data-visualisation
https://code.google.com/p/google-refine/
http://vis.stanford.edu/wrangler/Pre-process your data
16

17. http://nieuws.vtm.be/verkiezingen/gemeente?province=P1&city=G73
Always check & pre-process your data
17
Verkiezingen
14/10/12

18. Forget about 3D graphs(on a 2D screen..)
Occlusion
Complex to interact with
Doesn’t add anything to the data
18

19. Source: Stephen Few
What if we need to add a 3rd variable?
19

20. Use small coordinated graphs to add variables
20
Forget about 3D graphs (on a 2D screen)
Source: Stephen Few

21. Which student has more blogposts?
• Size & angle are difficult to compare
• Without labels & legends, impossible to show exact quantitative
differences
• Limited Short term (visual) memory
21

22. Source: Stephen Few
Save the pies for dessert (S. Few)
Try using either of the pies to put the slices in order by size
22

23. deredactie.be
demorgen.be
vtm.be
Verkiezingen
14/10/12
23

24. Obviously there are exceptions to the rule (1/2)
24
http://themetapicture.com/the-sunny-side-of-the-pyramid/

25. Obviously there are exceptions to the rule (2/2)
25

26. 0"
5"
10"
15"
20"
25"
30"
blogposts" tweets" comments"on"
blogs"
reports"
submi6ed"
Student'1'
Student"1"
0" 5" 10" 15" 20" 25" 30"
blogposts"
comments"on"blogs"
tweets"
reports"submi6ed"
Student'1'
Student"1"
Use Common Sense
0"
5"
10"
15"
20"
25"
30"
blogposts" comments"on"
blogs"
tweets" reports"
submi6ed"
Student'1'
Student"1"
26

27. 0" 10" 20" 30" 40" 50" 60"
Student"1"
Student"2"
Student"3"
Student"4"
blogposts"
tweets"
comments"on"blogs"
reports"submi:ed"
0%# 20%# 40%# 60%# 80%# 100%#
Student#1#
Student#2#
Student#3#
Student#4#
blogposts#
tweets#
comments#on#blogs#
reports#submi;ed#
Use Common Sense
What are you comparing?
What story do you get from it?
27

28. Which graph makes it easier to focus on the pattern of change
through time, instead of the individual values?
Choose graph that answers your questions about your data
28Source: Stephen Few

29. vtm.be
deredactie.be
nieuwsblad.be
Verkiezingen
14/10/12
Communicate the correct story
29

30. Don’t use visualisations to mislead
30

31. Don’t use visualisations to mislead
31

32. Source: Stephen Few
32

33. Source: Stephen Few 33

34. 34

35. ?
35

36. EXERCISE
Find all possible ways to visualize a
small data set of two numbers { 75, 37 }
36

37. http://blog.visual.ly/45-ways-to-communicate-two-quantities/
37

38. https://medium.com/accurat-studio/sketching-with-data-opens-the-mind-s-
eye-92d78554565
38

39. ?
39

40. Practicum opdracht
40

41. Maak een
interactieve visualisatie
van gegevens of informatie
met toegevoegde waarde
41

42. publiek?
doel?
data?
42

43. data?
- http://www.onderwijskiezer.be/v2/hoger/hoger_studierendement.php
- http://nl.soccerway.com/national/belgium/pro-league/20142015/regular-
season/r25415/
- http://www.programmableweb.com/apis/directory
- http://lak.linkededucation.org
- http://academic.research.microsoft.com/About/Help.htm
- http://labs.europeana.eu
- http://quantifiedself.com/2014/10/qs-access-app-see-healthkit-data-table/
- https://dev.twitter.com/rest/public
- http://opendata.antwerpen.be
- https://developer.spotify.com/web-api/
- http://developer.echonest.com/docs/v4
and so on, and so on, and so on…
43

44. Audience vs purpose
Explore Explain
Lay person
Domain experts
? ?
? ?
44

45. Explore
Data insights: a visualization (Gregor Aisch)

46. Explain
http://deredactie.be/cm/vrtnieuws/grafiek/interactief/1.2248561

47. http://ariadne.cs.kuleuven.be/wiki/index.php/MM-Course131447

48. https://www.youtube.com/watch?v=ynRrGRr5k90#t=29
48

49. https://mumepeg.wordpress.com/2013/12/12/update-visualisation/rangefiltersizechange/#main
49

50. Tegen volgende week
• Individueel:
• Spreadsheet aanvullen
• Infovis van de week
• Per team:
• Blogpost - oefening 75 - 37 ( scan met visualisaties/ wat geleerd)
• Publiek - Data - Verhaal
• Data - ruwe feasibility (eg omvang/formaat/etc. )
• Visuele alternatieven (sketches)
• 10 minuten slot om te presenteren / 5 minuten feedback
50

51. ?
51