Osm Quality Assessment 2008

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Muki Haklay

OSM Quality Assessment - presented in S4 event, London, 8th Jan 2008

Technologie Bildung

Understanding the quality of user generated mapping – comparing OpenStreetMap to Ordnance Survey geodata Dr Muki Haklay Department of Civil, Environmental and Geomatic Engineering, UCL [email_address]

Outline ,[object Object],[object Object],[object Object],[object Object]

User Generated Geographical information ,[object Object],[object Object],[object Object]

Geograph.org.uk ,[object Object],[object Object],[object Object]

OpenStreetMap ,[object Object],[object Object],[object Object],[object Object],(Image source: OpenStreetMap)

OpenStreetMap ,[object Object],[object Object]

Creating Maps for OSM (Image source: OpenStreetMap)

OSM technological stack (cc) OpenStreetMap Haklay, M. And Weber, P., 2008, OpenStreetMap – User Generated Street Map, IEEE Pervasive Computing.

Simplified glue – OSM API vs. OGC WMS ,[object Object],[object Object],[object Object],Haklay, M. And Weber, P., 2008, OpenStreetMap – User Generated Street Map, IEEE Pervasive Computing.

Mapping parties (cc) Urbanwide - flickr (cc) Nick black (c) Andrea Antonello

Achievements ,[object Object],[object Object],[object Object]

The quality issue ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The problem ,[object Object],[object Object]

Who collects? (c) Dair Grant (cc) Chris Fleming (cc) Shaun McDonald

Number of Users Area covered (Sq Km) 1 40021 2 20720 3 9136 4 4184 5 1986 6 936 7 448 8 269 9 139 10 and above 246

Accuracy and Completeness ,[object Object],[object Object],[object Object]

Positional Accuracy ,[object Object],A B

Goodchild and Hunter (1997), Hunter (1999) method ,[object Object],[object Object],[object Object]

Motorway comparison ,[object Object],[object Object],Motorway Percentage Overlap M1 87.36% M2 59.81% M3 71.40% M4 84.09% M4 Spur 88.77% M10 64.05% M11 84.38% M20 87.18% M23 88.78% M25 88.80% M26 83.37% M40 72.78% A1(M) 85.70% A308(M) 78.27% A329(M) 72.11% A404 76.65%

Positional accuracy ,[object Object],[object Object],Area Average difference (m) Barnet 6.77 Highgate 8.33 New Cross 6.04 South Norwood 3.17 Sutton 4.83 Total 5.83

Completeness – bulk method ,[object Object],[object Object],[object Object]

Length comparison ,[object Object],[object Object],[object Object]

So should I use OSM? ,[object Object],[object Object],[object Object]

Conclusions ,[object Object],[object Object],[object Object]

Further reading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Osm Quality Assessment 2008

1. Understanding the quality of user generated mapping – comparing OpenStreetMap to Ordnance Survey geodata Dr Muki Haklay Department of Civil, Environmental and Geomatic Engineering, UCL [email_address]

4. Flickr

6. Google Map Maker

9. Creating Maps for OSM (Image source: OpenStreetMap)

10. OSM technological stack (cc) OpenStreetMap Haklay, M. And Weber, P., 2008, OpenStreetMap – User Generated Street Map, IEEE Pervasive Computing.

11.

12. (Image source: OpenStreetMap)

13. Mapping parties (cc) Urbanwide - flickr (cc) Nick black (c) Andrea Antonello

14.

15.

16.

17. Who collects?

18. Who collects? (c) Dair Grant (cc) Chris Fleming (cc) Shaun McDonald

19. Working together

20. Number of Users Area covered (Sq Km) 1 40021 2 20720 3 9136 4 4184 5 1986 6 936 7 448 8 269 9 139 10 and above 246

21.

22.

23.

24.

25.

26. Estimating positional accuracy

27.

28.

29.

30. London

31. Birmingham

32. Manchester and Liverpool

33.

34. Completeness - visual comparison

35. Completeness – visual comparison

36. Completeness

37. Spatial justice and OSM

38. Spatial justice and OSM

39.

40.

41.