This document discusses OpenStreetMap (OSM), a collaborative project to create a free editable map of the world. It provides information on how OSM is created through field mapping, GPS traces, and imports. The document also describes how OSM data is stored and can be accessed through APIs. Examples are given showing how GPS trace data has been analyzed in different cities to understand patterns of where mappers have traveled and mapped. Limitations and issues with OSM data and coverage are also summarized.

1. OpenStreetMap and positioningJaakLainesteOpenStreetMap EstoniaNutiteq.com

2. OpenStreetMapWikipedia of mapsGlobal databaseFocused to current street mapsNo elevation, history etcCommunity300.000+ registered usersVery strong in GermanyFree and open to useCC-BY-SA license

3. How OSM is createdField mappingGPS tracesWalking Papers – paper notesOn-screen mappingYahoo! ImageryRegional sources: e.g. Estonian National Land BoardImportsUSA: TIGER dataEurope: Corine Land Cover etc

5. Mapping parties

7. Data in OSM DatabasesMap dataNodes, ways, relationsTagged openlyHistory: who, when, changesetsGPS tracesBase for map

8. GPS Trace dataHTTP REST-based APIBased on BBOXTracks and trackpoints (lat/long)No timestamp, user IDGPX format (simple XML) Someone has been in point XTrack details from databaseTimestamp, user ID

9. Map dataWays and nodes:User IDEditing timeInformation about locations:Probably editor has been in the point around editing time (+ maybe few weeks)Density of different editorsQuite ambiguous

10. London – different editorsITOWorld extract

11. Using OSM dataGPS trackHigh precision – time and locationLess usersMap locationsLow precisionMore usersMovement distributionPlaces what and when users have visited

12. OSM advantagesCoverage is:GlobalQuick, get the data nowFreeReal usability?Real coverage is variable

13. Coverage statisticshttp://wiki.openstreetmap.org/wiki/StatisticsRegistered users: ~300,000, <5% activeAbout 6,000 editors/weekTracksPoints: ~200,000,000,000 Traces: 800,000 tracesMap nodes: ~ 750,000,000

14. Key issuesUser is in „mapping mode“. May be special tripMost mappers do not upload/share GPS tracesUser can trace aerials, without being thereRegional differencesVery good in e.g. Germany, UKLimited in e.g. US (TIGER imports)

15. Other uses of OSMUse OpenStreetMap as a base mapPositioning accuracy improvement GPS trace shows where people are more probablyShare your GPS traces in OSMContribute to OSMfix map of your neighbourhoods!

16. Study: distribution of GPS tracesTwo random cities pickedTartu, Estonia – well-known townWeimar, Germany – unknown townGPS traces downloaded for town areaTartu – 9x9 km, 160.000 points, 42 tracksWeimar – 7x7 km, 100.000 points, 33 tracksSpatial distribution of tracesVisualized in 50 or 100-m grid

17. Tartu map in OSM

18. Tartu GPS traces

19. Tartu, 100m grid of GPS points

20. Weimar map

21. Weimar, GPS trackpoints

22. Weimar, 50m grid

23. Map of central London

24. GPS traces

25. GPS points on map

26. London gridPoints: 440 000, tracks: 220