Osm Quality Assessment 2008

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Muki Haklay

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

Technology Education

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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