crowdsourcing geodata - geofabrik · crowdsourcing: open / closed “closed” crowdsourcing: users...
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Crowdsourcing Geodata
Frederik [email protected]
SoC Summer SchoolSouthampton, 08 September, 2009
Looking back on 5 years of
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OpenStreetMap
● Started 5 years ago in the UK
● 150k users today, about 10% of them active
● 1.5bn GPS track points
● 500m objects (roughly edited manually)
● 40 national mailing lists on 6 continents
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CrowdsourcingUser generated content
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CrowdsourcingUser generated content
Crowdsourcing
marketplaces
competitions
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CrowdsourcingUser generated content
Crowdsourcing
Volunteered Geographic Information
OpenStreetMap
Map Share
Wikimapia
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Crowdsourcing: open / closed
● “closed” crowdsourcing:
users as cheap labour, controlled by central
organisation
● “open” crowdsourcing:
users as partners and decision makers;
building a community
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What
motivates
150.000 people?
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(Berlin, early 2007)
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People
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People
● worker bees
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People
● worker bees
● mayflies
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People
● worker bees
● professionals
● mayflies
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People
● worker bees
● professionals
● ideologues
● mayflies
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People have different...
● technical skills
● patience and endurance
● social behaviour
● thematic expertise
● ...
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Community Care
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Community Care
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Who owns the project?
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Who owns the project?
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Quality and control
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... all in a nutshell:
● no hurdles for joining
● user = stakeholder – relinquish control
● assume good faith
● “instant reward”
● patience
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www.openstreetmap.orgwww.geofabrik.de
Frederik [email protected] GEOFABRIK
http://www.openstreetmap.org/
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