This document discusses OpenStreetMap and crowd-sourced mapping. It presents data on four mappers - their time mapping, number of edits, and use of GPS traces. It also examines crowd quality indicators for OpenStreetMap like number of map versions, users, age of the data, and changes to features over time. Finally, it raises challenges with processing large OSM data, accessing private GPS traces, and interpreting the crowd quality metrics.

1. OpenStreetMap
and the art of motorcycle maintenance
Martijn van Exel
Amsterdam, the Netherlands
Sunday, July 11, 2010

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10. flickr:harrywood
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12. TRU
ST
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13. Crowd Quality
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14. Crowd Quality
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17. paulbe
AND
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18. paulbe
AND
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19. paulbe
AND
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20. paulbe
LHCarsten
AND
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21. paulbe
LHCarsten
grossing
AND
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22. paulbe
LHCarsten
grossing
AND
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23. paulbe
LHCarsten
grossing
mvexel
AND
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24. paulbe
LHCarsten
grossing
mvexel
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25. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

26. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

27. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

28. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

29. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

30. mapper since June 2008
paulbe 1756 changesets
0 public traces
mapper since Feb 2007
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
grossing 552 changesets
5 public traces
mapper since Jun 2007
mvexel 365 changesets
31 public traces
Sunday, July 11, 2010

31. mapper since June 2008
9 paulbe 1756 changesets
0 public traces
mapper since Feb 2007
6
LHCarsten 297 changesets
49 public traces
mapper since Sep 2009
4 grossing 552 changesets
5 public traces
mapper since Jun 2007
7 mvexel 365 changesets
31 public traces
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33. Crowd Quality indicators
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34. Crowd Quality indicators
versions
users
age
spatial flux
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35. Crowd Quality indicators
versions
users
age
spatial flux
5.5
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37. 4.9 4.3
4.7
7.1
3.2 2.0
4.7 5.5 3.0
7.3 7.2
0.0
8.1
0.0 5.1
4.4
6.0
4.9
6.6 4.5
4.2 7.1
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40. van marwijk happy
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41. Challenges
A lot of data processing
Access to private data (traces)
How to interpret?
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42. Thank you!
martijn@geodan.nl
http://research.geodan.nl/
http://oegeo.wordpress.com/
twitter: @mvexel
Sunday, July 11, 2010