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 OpenStreetMapComplete 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 dataComing 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 Imagesfrom 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, pnvkarte.deThanks also to thedesignsuperhero.com for free clipart

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