Introduction.- Alternative GIS (alt.gis) and the six senses of the new mind.- Section 1: Web and Crowd-Sourcing GI.- Enriching Navigation Instructions to Support the Formation of Mental Maps.- A Classification of User Contributions on the Participatory Geoweb.- Identifying Locally- And Globally-Distinctive Urban Place Descriptors from Heterogeneous User-Generated Content.- Identifying Optimal Study Areas and Spatial Aggregation Units for Point-based VGI from Multiple Sources.- A General Framework... Mehr