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OpenStreetMap

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Presentation by Jochen Topf about OpenStreetMap at the DC-2008 Wikimedia Workshop on User Generated Metadata

Presentation by Jochen Topf about OpenStreetMap at the DC-2008 Wikimedia Workshop on User Generated Metadata

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  • 1. OpenStreetMap www.openstreetmap.org Jochen Topf    
  • 2. A community project to map the world.    
  • 3. Worldwide project Everybody can contribute We are collecting geodata Open tagging, no fixed schema Free license (CC­BY­SA)    
  • 4.    
  • 5.    
  • 6. Berlin beginning of 2007    
  • 7.    
  • 8.    
  • 9.    
  • 10.    
  • 11.    
  • 12. Routing / Navigation    
  • 13.   Collecting GPS data...  
  • 14. Collecting attributes ● On foot, by bike, car, train, ... ● Tracks and waypoints ● Notes on paper ● Audio notes ● Photos ● Out of copyright maps    
  • 15. Aerial Images ● Aerial/Satellite Images ● From Landsat ● From Yahoo ● ...    
  • 16.    
  • 17. Data model ● “The simplest thing that could possibly work.”  (Ward Cunningham) ● All data stored in central database ● Geometric objects ● With history    
  • 18. Data model Nodes Ways Relations    
  • 19. Tags waterway=river highway=stairs highway=cycleway highway= residential bridge=yes,  layer=1 leisure= park highway= footway railway= light_rail highway=secondary railway=halt    
  • 20. Data model ● Objects with – A position/extent – A number of Tags (key=value) ● No – class/attributes – complete list of attributes – no ontology – no hierarchy    
  • 21. Where do tags come from? ● Invented as needed by people needing them ● Discussion on mailing lists and wiki ● Documentation in wiki ● Voting process (mostly ignored) ● Reorganization needed? ● Coexisting schemes?    
  • 22. Rough consensus We reject: kings, presidents and voting. We believe in: rough consensus and running  code. (David D. Clark)    
  • 23. Problems ● Tagging “for the renderers” ● Tagging only for current use of data ● Much of the available information is therefore  not stored and will be lost ● Might need costly re­acquisition of data    
  • 24. We don't need no metadata.... ● No formal metadata ● Just freetext wiki explanations ● Work needed to extract usable data    
  • 25. Data mining Full­text vs. meta­data Google vs. Library Data mining vs. lookup    
  • 26. Tagwatch ● Statistics about actual use ● Look at the data and infer metadata ● Needs large body of data ● Doesn't work for new tags    
  • 27. www.openstreetmap.org www.geofabrik.de Jochen Topf jochen.topf@geofabrik.de All maps in this talk are Copyright 2008 OpenStreetMap Contributors     The talk itself is Copyright 2008 Jochen Topf Licence for maps and talk: Creative Commons CC­BY­SA