Your SlideShare is downloading. ×
0
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
Openstreetmap, GPS traces and positioning
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

1,926

Published on

Presentation in Mobile Tartu 2010 seminar

Presentation in Mobile Tartu 2010 seminar

Published in: Technology
0 Comments
1 Like
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total Views
1,926
On Slideshare
0
From Embeds
0
Number of Embeds
4
Actions
Shares
0
Downloads
0
Comments
0
Likes
1
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

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

    • 1. OpenStreetMap and positioning<br />JaakLainesteOpenStreetMap Estonia<br />Nutiteq.com<br />
    • 2. OpenStreetMap<br />Wikipedia of maps<br />Global database<br />Focused to current street maps<br />No elevation, history etc<br />Community<br />300.000+ registered users<br />Very strong in Germany<br />Free and open to use<br />CC-BY-SA license<br />
    • 3. How OSM is created<br />Field mapping<br />GPS traces<br />Walking Papers – paper notes<br />On-screen mapping<br />Yahoo! Imagery<br />Regional sources: e.g. Estonian National Land Board<br />Imports<br />USA: TIGER data<br />Europe: Corine Land Cover etc<br />
    • 4.
    • 5. Mapping parties<br />
    • 6.
    • 7. Data in OSM Databases<br />Map data<br />Nodes, ways, relations<br />Tagged openly<br />History: who, when, changesets<br />GPS traces<br />Base for map<br />
    • 8. GPS Trace data<br />HTTP REST-based API<br />Based on BBOX<br />Tracks and trackpoints (lat/long)<br />No timestamp, user ID<br />GPX format (simple XML) <br />Someone has been in point X<br />Track details from database<br />Timestamp, user ID<br />
    • 9. Map data<br />Ways and nodes:<br />User ID<br />Editing time<br />Information about locations:<br />Probably editor has been in the point around editing time (+ maybe few weeks)<br />Density of different editors<br />Quite ambiguous<br />
    • 10. London – different editors<br />ITOWorld extract<br />
    • 11. Using OSM data<br />GPS track<br />High precision – time and location<br />Less users<br />Map locations<br />Low precision<br />More users<br />Movement distribution<br />Places what and when users have visited<br />
    • 12. OSM advantages<br />Coverage is:<br />Global<br />Quick, get the data now<br />Free<br />Real usability?<br />Real coverage is variable<br />
    • 13. Coverage statistics<br />http://wiki.openstreetmap.org/wiki/Statistics<br />Registered users: ~300,000, <5% active<br />About 6,000 editors/week<br />Tracks<br />Points: ~200,000,000,000 <br />Traces: 800,000 traces<br />Map nodes: ~ 750,000,000<br />
    • 14. Key issues<br />User is in „mapping mode“. May be special trip<br />Most mappers do not upload/share GPS traces<br />User can trace aerials, without being there<br />Regional differences<br />Very good in e.g. Germany, UK<br />Limited in e.g. US (TIGER imports)<br />
    • 15. Other uses of OSM<br />Use OpenStreetMap as a base map<br />Positioning accuracy improvement <br />GPS trace shows where people are more probably<br />Share your GPS traces in OSM<br />Contribute to OSM<br />fix map of your neighbourhoods!<br />
    • 16. Study: distribution of GPS traces<br />Two random cities picked<br />Tartu, Estonia – well-known town<br />Weimar, Germany – unknown town<br />GPS traces downloaded for town area<br />Tartu – 9x9 km, 160.000 points, 42 tracks<br />Weimar – 7x7 km, 100.000 points, 33 tracks<br />Spatial distribution of traces<br />Visualized in 50 or 100-m grid<br />
    • 17. Tartu map in OSM<br />
    • 18. Tartu GPS traces<br />
    • 19. Tartu, 100m grid of GPS points<br />
    • 20. Weimar map<br />
    • 21. Weimar, GPS trackpoints<br />
    • 22. Weimar, 50m grid<br />
    • 23. Map of central London<br />
    • 24. GPS traces<br />
    • 25. GPS points on map<br />
    • 26. London grid<br />Points: 440 000, tracks: 220<br />
    • 27. Thank you!<br />Jaak Laineste<br />jaak@openstreetmap.ee<br />www.openstreetmap.org<br />wiki.openstreetmap.org <br />Credits: Microsoft support for fixing my PowerPoint<br />

    ×