WhereCamp.EU session: State Of The States in OpenStreetMap
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WhereCamp.EU session: State Of The States in OpenStreetMap

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My session at WhereCamp.EU (http://wherecamp.eu ) - Friday Morning 12th March ...

My session at WhereCamp.EU (http://wherecamp.eu ) - Friday Morning 12th March

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http://www.socialtext.net/wherecamp/index.cgi?wherecamp_eu_session_the_state_of_the_states_in_openstreetmap

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    WhereCamp.EU session: State Of The States in OpenStreetMap WhereCamp.EU session: State Of The States in OpenStreetMap Presentation Transcript

    • Harry Wood http://harrywood.co.uk State of the States in OpenStreetMap Where Camp EU session slides
    • Topics
      • The U.S. free data situation
      • The state of the States. TIGER data
      • More imports
      • 250 cities routing grid
      • Duplicate nodes
      • 'waychains' analysis
    • “Target Market”
      • U.S. is a big “market”
      • U.S. is full of...
        • Potential OpenStreetMap mappers
      (Insert GPS ownership stats)
        • Potential OpenStreetMap developers
        • Potential OpenStreetMap data users
    • OpenStreetMap
      • The Free Wiki World Map
      • “Open” data
      • Easily editable. Lots of contributors. Community!
    • TIGER
      • Topologically Integrated Geographic Encoding and Referencing system
      • Government. Public Domain
      • Many organisations / agencies / sources
      • Massive free data set!
      • 2008 TIGER imported into OpenStreetMap Complete street map! ?
    •  
    •  
    • TIGER problems
      • Misaligned roads ← Main problem
      • Connectivity along county borders
      • Over connectedness
      • Wrong-way motorway
      • Wrong-way motorway-link
      • Missing bits of motorway or railway
      • Only one way to represent a two-carriageway highway
      • Wrong road classifications
      • roads joined that shouldn't
      • roads that cross on different levels get intersection nodes
      • railway and roads moved so they intersect when they don't
      • etc......
    • More Imports
      • More government data
        • Coming available as OpenStreetMap
        • open data in general gains traction
      • How to merge with TIGER data?
      • How to merge with community data?
      • How to assess quality?
        • “Suitable for a web mapping project”
        • Fobbed off with low quality data
      • How to coordinate as a community?
        • Decide not to import
    • Imports damage community
      • Psychology. TIGER data is off-putting
      • Fixing is not as fun as raw mapping
    • Need people editing
    • Basic Routing Problems
      • Discover data errors by routing
      • Focus on the interstate network
    • 250 cities routing grid
    • “Tortuous” routes >1.5 times longer than straight line distance
    • Duplicate Nodes
    • New Duplicate Nodes Map
        All dupe nodes updated minutely
    • “waychains” analysis
      • Looking just at highway=motorway
      • Find ways joined end-to-end
    • Osmosis processing planet.osm 160GB! or 7.3 GB bzipped us-motorways.osm 308MB Diffs us-motorways-simplified.osm 55MB
    • us-motorways-simplified.osm
    • Osmosis processing planet.osm 160GB! or 7.3 GB bzipped us-motorways.osm 308MB Diffs us-motorways-simplified.osm 55MB waychains!
    • Split waychains by 'ref'
    • HTML report
    • 'All paired refs' map
        Not too good so far
    • More waychain pairing needed 290 paired out of 1124 different ref values (25%)
    • Find problems
        Ways which should join the chain
      Lots of problems with ref values (unfortunately)
    • Harry Wood http://harrywood.co.uk State of the States
      • Priority #1 - More community
      • Priority #2 - Fix data problems
      • Priority #999999 - Import more crap
      Open Licensed Map Images from OpenStreetMap.org CC-BY-SA
    • Harry Wood's interest in internet collaboration and web2.0 technologies lead him to the OpenStreetMap project three years ago, as a hobbyist mapper, and as an increasingly passionate evangelist, community coordinator and developer. Turning this hobby into a profession, he worked at CloudMade developing core features of the OpenStreetMap website and working on products and services which help developers use OpenStreetMap data. In 2010 he joined placr.co.uk to develop their new geo API products, as well as operating as a part-time freelance OpenStreetMap consultant, and humanitarian OpenStreetMap activist. He was also on the organising team for WhereCamp EU http://harrywood.co.uk These slides are (of course) freely re-usable under the Creative Commons Attribution-ShareAlike 2.0 License Map images cc-by-sa2 OpenStreetMap.org contributors. “Pale-dawn” map styles by CloudMade, OpenCycleMap.org, OpenPisteMap.org, öpnvkarte.de Thanks also to thedesignsuperhero.com for free clipart