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New osm backgrounder

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OpenStreetMap 101
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New osm backgrounder

  1. 1. OSM Background 1Thursday, April 10, 14
  2. 2. OpenStreetMap Background • Open Data Project • Build a truly free map of the world • “The Wikipedia of Maps” 2Thursday, April 10, 14
  3. 3. OSM History • Initiated by Steve Coast in 2005 • Started in the UK • Because Ordnance Survey maps were expensive • Rapidly grew to a worldwide project 3Thursday, April 10, 14
  4. 4. International Variations • Significant differences country to country • Europe started mostly from scratch •US imported a base map based on Census Bureau TIGER road centerline Data in 2007 •In Canada, CANVEC imports are ongoing 4Thursday, April 10, 14
  5. 5. Licensing • Originally Creative Commons • CC BY-SA was a poor fit to a fact database • Migrated to ODbL (Open Database License) • Migration was painful, but is now over 5Thursday, April 10, 14
  6. 6. OSM in the Capital District 6Thursday, April 10, 14
  7. 7. Differences from Wikipedia • Wikipedia discourages original research • OSM depends on original research • Edit wars less of an issue • easily verifiable facts make a big difference 7Thursday, April 10, 14
  8. 8. Differences from Google Maps • Google Maps is “Free” only in a limited sense (read the ToS) • Google owns all Intellectual Property • Google does not provide for community governance 8Thursday, April 10, 14
  9. 9. Other Properties • No pre-moderation • Different structure than traditional GIS • Two tier model: • database • data consumers 9Thursday, April 10, 14
  10. 10. OpenCycleMap 10Thursday, April 10, 14
  11. 11. TopOSM 11Thursday, April 10, 14
  12. 12. The US & TIGER • TIGER has problems which effectively require us to either review & correct or replace all data • Long, slow process of Ground Surveys 12Thursday, April 10, 14
  13. 13. Support Tools • ITOWorld - Tiger Reviewed Map 13Thursday, April 10, 14
  14. 14. Capital District 14Thursday, April 10, 14
  15. 15. South of Albany 15Thursday, April 10, 14
  16. 16. OSM Data Model • Three basic entities • Node - lat, long • optional tags • Way - list of nodes • direction • optional tags • roads, boundaries, entity footprints 16Thursday, April 10, 14
  17. 17. OSM Data Model • Relations • Bags of nodes, ways & relations • Entities in a relation have roles • Tags • Key/value pairs • Names, addresses, characteristics 17Thursday, April 10, 14
  18. 18. Tags for Western Avenue highway=primary name=Western Avenue ref=US 20 maxspeed=30 mph 18Thursday, April 10, 14 and we use a relation to bind together all the segments that make up US 20
  19. 19. State of OSM Today • Excellent Display Map • Reviewed areas generally route well • Lack much address data • POIs incomplete 19Thursday, April 10, 14
  20. 20. TIGER Review • Some parts of the US are great • Vast rural areas are largely unreviewed • Need more dedicated mappers • But how to persuade them that reviewing TIGER is worth their time? 20Thursday, April 10, 14
  21. 21. Addresses • Where do we get them? • Enhanced 911? • Parcel Data? • On Foot? 21Thursday, April 10, 14
  22. 22. POIs • Point of Interest databases are hard to collect and hard to keep up to date • Small businesses open and close with some frequency • “Enter and forget” 22Thursday, April 10, 14
  23. 23. Pause for General OSM Questions 23Thursday, April 10, 14

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