Trusting the Crowd - Methods for Moving from

Crowdsourced to Authoritative Data

Kate Chapman@wonderchook

Volunteered Geographic Information (VGI)

vs.Crowdsourcing?

Crowdsourced“vs.”

Authoritative Data

Is participatory mapping crowdsourcing?

How does the magic happen?

New York City Building Footprints Imported into OpenStreetMap

crowdgov.wordpress.com/

• Natural Resources Canada-OpenStreetMap Synergy

• FixMyStreet• Use of Corine Land Cover in OpenStreetMap in

France• Haiti Disaster Response• Community Mapping for Exposure in Indonesia• New York City Open Data Initiative• State Department HIU – Imagery to the Crowd

Thank you!@wonderchook

kchapman@cadasta.org