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Day1-1610-Validating OpenStreetMap
sotm2017
September 01, 2017
Research
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Day1-1610-Validating OpenStreetMap
Friday 4:10pm, Main hall
Arun Ganesh
http://2017.stateofthemap.org/2017/validating-openstreetmap/
sotm2017
September 01, 2017
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Transcript
Validating the map State of the Map 2017, Japan user:PlaneMad
| Arun Ganesh
Crowdsourced data projects
Cities can become shops
Or an office
Or just get a bad name
Why does it happen?
My mouse moved
It’s time to rename my city
This looks prettier
The virus has caught on
This description tag looks useful
Need PokeStop now
This is a nice place to draw
From where? Contributors or Software
60% of harmful changes are from New contributors Source: OSMCha
New contributors Naturally make mistakes Not aware of OpenStreetMap Not
aware of contribution guidelines Not familiar with editing tools Not familiar with tagging system Not aware of community
Experienced contributors Make large scale edits Use powerful tools Edit
important and very complex features Not scared of making a mistake But mistakes happen
More new and active contributors than ever before
Software Simple tools attracts new users Power tools allows large
scale editing Don’t give powerful tools to new users
Everything breaks
Protecting the map No single strategy can be foolproof We
need as many eyes on the data as possible
We need to see the data, not the map
Foolproof data validation requires local context
We need accessible tools for community to peer review data
Over 30 tools listed on OSM Wiki None on the OSM Homepage
30,000 changesets by 4,000 users everyday. 2000 new users/day
OSMChangesetAnalyzer
Filter changesets by location, date, category..
Visualize a changeset like Achavi
Peer review and tag changesets
103,680 changesets reviewed 14,133 found with bad quality Use for
machine learning?
Contribute Source code https://github.com/mapbox/osmcha-frontend/issues Write detectors https://github.com/mapbox/osm-compare
Get in touch arun@mapbox.com Join the OSMCha Workshop on Sunday
1.30pm