@unpublished{TUW-214743, author = {Schmidt, Manuela and Klettner, Silvia and Steinmann, Renate and H{\"a}usler, Elisabeth}, title = {The Impact of the Contributor in VGI Projects}, year = {2012}, keywords = {OpenStreetMap, Volunteered Geographic Information}, note = {talk: Workshop on Map Creation From User Generated Data, Hannover; 2012-10-08} }