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OpenStreetMap
    www.openstreetmap.org

          Jochen Topf



                
A community project
     to map the world.



              
Worldwide project
      Everybody can contribute
     We are collecting geodata
    Open tagging, no fixed schema
      Fr...
     
     
Berlin beginning of 2007
                    
     
     
     
     
     
Routing / Navigation




              
    Collecting GPS data...
                
Collecting attributes
    ●   On foot, by bike, car, train, ...
    ●   Tracks and waypoints
    ●   Notes on paper
    ● ...
Aerial Images
    ●   Aerial/Satellite Images
    ●   From Landsat
    ●   From Yahoo
    ●   ...




                    ...
     
Data model
    ●   “The simplest thing that could possibly work.” 
        (Ward Cunningham)
    ●   All data stored in ce...
Data model

    Nodes

                                 Ways




            Relations
                         
Tags
                                  waterway=river             highway=stairs
    highway=cycleway



highway=
resident...
Data model
    ●   Objects with
        –   A position/extent
        –   A number of Tags (key=value)
    ●   No
        ...
Where do tags come from?
    ●   Invented as needed by people needing them
    ●   Discussion on mailing lists and wiki
  ...
Rough consensus



     We reject: kings, presidents and voting.
    We believe in: rough consensus and running 
         ...
Problems
    ●   Tagging “for the renderers”
    ●   Tagging only for current use of data
    ●   Much of the available in...
We don't need no metadata....
    ●   No formal metadata
    ●   Just freetext wiki explanations
    ●   Work needed to ex...
Data mining



    Full­text vs. meta­data

      Google vs. Library

    Data mining vs. lookup



                
Tagwatch
    ●   Statistics about actual use
    ●   Look at the data and infer metadata
    ●   Needs large body of data
...
www.openstreetmap.org
               www.geofabrik.de

                     Jochen Topf
               jochen.topf@geofabr...
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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

Published in: Technology

OpenStreetMap

  1. 1. OpenStreetMap www.openstreetmap.org Jochen Topf    
  2. 2. A community project to map the world.    
  3. 3. Worldwide project Everybody can contribute We are collecting geodata Open tagging, no fixed schema Free license (CC­BY­SA)    
  4. 4.    
  5. 5.    
  6. 6. Berlin beginning of 2007    
  7. 7.    
  8. 8.    
  9. 9.    
  10. 10.    
  11. 11.    
  12. 12. Routing / Navigation    
  13. 13.   Collecting GPS data...  
  14. 14. Collecting attributes ● On foot, by bike, car, train, ... ● Tracks and waypoints ● Notes on paper ● Audio notes ● Photos ● Out of copyright maps    
  15. 15. Aerial Images ● Aerial/Satellite Images ● From Landsat ● From Yahoo ● ...    
  16. 16.    
  17. 17. Data model ● “The simplest thing that could possibly work.”  (Ward Cunningham) ● All data stored in central database ● Geometric objects ● With history    
  18. 18. Data model Nodes Ways Relations    
  19. 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. 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. 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. 22. Rough consensus We reject: kings, presidents and voting. We believe in: rough consensus and running  code. (David D. Clark)    
  23. 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. 24. We don't need no metadata.... ● No formal metadata ● Just freetext wiki explanations ● Work needed to extract usable data    
  25. 25. Data mining Full­text vs. meta­data Google vs. Library Data mining vs. lookup    
  26. 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. 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

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