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Sven's and my submission for 2008's AGILE conference. Unfortunately, the paper lacks an implementation. But in this case I would claim that there is nothing we can do about it. It lies in the responsibility of the data providers to incorporate quality metrics and user feedback tools to visualize certain quality properties like completeness. The slides for the talk are attached.

This paper was my submission for the Workshop on Volunteered Geographic Information in Santa Barbara in December 2007. Here I further focus on how to communicate the credibility of spatial data contributed by users like you and me. It takes some of the ideas of my GI Days submission.

This paper represents the status of my PhD in late 2007. It presents the motivation, research questions (and accordingly the hypothesis), the approach, and what has been achieve so far.

This short paper starts with an introduction into participatory GIS, which means to let normal (non-professionals) participate in the creation, evaluation and usage of GI, usually in the context of geospatial decision making. A solution is needed to communicate the credibility (and therefore also usefulness) of user-created GI in these scenarios, and here we introduce Reputation of the user as such a tool. Several applications exist in which reputation can help to evalute usefulness.

Retrieval of web-based geographic information (GI) for spatial decision-making processes can benefit from emerging semantic technologies. Ontology-supported metadata, collaboratively created by a social network of spatially-aware users, ensures efficient and precise discovery of maps published with the help of catalogs. The creation and maintenance of the metadata is driven by two forces: on the one hand experienced catalogers who ensure consistency and quality, on the other hand catalog users who continuously adapt and extend the metadata.