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Openstreetmap, GPS traces and positioning
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Openstreetmap, GPS traces and positioning

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Presentation in Mobile Tartu 2010 seminar

Presentation in Mobile Tartu 2010 seminar

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  • ... And you can create it too?
  • You can see some roads which stand out

Transcript

  • 1. OpenStreetMap and positioning
    JaakLainesteOpenStreetMap Estonia
    Nutiteq.com
  • 2. OpenStreetMap
    Wikipedia of maps
    Global database
    Focused to current street maps
    No elevation, history etc
    Community
    300.000+ registered users
    Very strong in Germany
    Free and open to use
    CC-BY-SA license
  • 3. How OSM is created
    Field mapping
    GPS traces
    Walking Papers – paper notes
    On-screen mapping
    Yahoo! Imagery
    Regional sources: e.g. Estonian National Land Board
    Imports
    USA: TIGER data
    Europe: Corine Land Cover etc
  • 4.
  • 5. Mapping parties
  • 6.
  • 7. Data in OSM Databases
    Map data
    Nodes, ways, relations
    Tagged openly
    History: who, when, changesets
    GPS traces
    Base for map
  • 8. GPS Trace data
    HTTP REST-based API
    Based on BBOX
    Tracks and trackpoints (lat/long)
    No timestamp, user ID
    GPX format (simple XML)
    Someone has been in point X
    Track details from database
    Timestamp, user ID
  • 9. Map data
    Ways and nodes:
    User ID
    Editing time
    Information about locations:
    Probably editor has been in the point around editing time (+ maybe few weeks)
    Density of different editors
    Quite ambiguous
  • 10. London – different editors
    ITOWorld extract
  • 11. Using OSM data
    GPS track
    High precision – time and location
    Less users
    Map locations
    Low precision
    More users
    Movement distribution
    Places what and when users have visited
  • 12. OSM advantages
    Coverage is:
    Global
    Quick, get the data now
    Free
    Real usability?
    Real coverage is variable
  • 13. Coverage statistics
    http://wiki.openstreetmap.org/wiki/Statistics
    Registered users: ~300,000, <5% active
    About 6,000 editors/week
    Tracks
    Points: ~200,000,000,000
    Traces: 800,000 traces
    Map nodes: ~ 750,000,000
  • 14. Key issues
    User is in „mapping mode“. May be special trip
    Most mappers do not upload/share GPS traces
    User can trace aerials, without being there
    Regional differences
    Very good in e.g. Germany, UK
    Limited in e.g. US (TIGER imports)
  • 15. Other uses of OSM
    Use OpenStreetMap as a base map
    Positioning accuracy improvement
    GPS trace shows where people are more probably
    Share your GPS traces in OSM
    Contribute to OSM
    fix map of your neighbourhoods!
  • 16. Study: distribution of GPS traces
    Two random cities picked
    Tartu, Estonia – well-known town
    Weimar, Germany – unknown town
    GPS traces downloaded for town area
    Tartu – 9x9 km, 160.000 points, 42 tracks
    Weimar – 7x7 km, 100.000 points, 33 tracks
    Spatial distribution of traces
    Visualized 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 grid
    Points: 440 000, tracks: 220
  • 27. Thank you!
    Jaak Laineste
    jaak@openstreetmap.ee
    www.openstreetmap.org
    wiki.openstreetmap.org
    Credits: Microsoft support for fixing my PowerPoint