Your SlideShare is downloading. ×
Openstreetmap, GPS traces and positioning
Upcoming SlideShare
Loading in...5

Thanks for flagging this SlideShare!

Oops! An error has occurred.

Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Openstreetmap, GPS traces and positioning


Published on

Presentation in Mobile Tartu 2010 seminar

Presentation in Mobile Tartu 2010 seminar

Published in: Technology

1 Like
  • Be the first to comment

No Downloads
Total Views
On Slideshare
From Embeds
Number of Embeds
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

No notes for slide
  • ... And you can create it too?
  • You can see some roads which stand out
  • Transcript

    • 1. OpenStreetMap and positioning
      JaakLainesteOpenStreetMap Estonia
    • 2. OpenStreetMap
      Wikipedia of maps
      Global database
      Focused to current street maps
      No elevation, history etc
      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
      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:
      Quick, get the data now
      Real usability?
      Real coverage is variable
    • 13. Coverage statistics
      Registered users: ~300,000, <5% active
      About 6,000 editors/week
      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
      Credits: Microsoft support for fixing my PowerPoint