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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

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