A Technical Framework for Visualizing Spatio-temporal Quality Metrics of Volunteered Geographic Information

The following paper presents a technical framework that allows for visualization of spatio-temporal quality metrics (user activity, topicality or number of features) of Volunteered Geographic Information using the example of OpenStreetMap (OSM). The aim of the system is to allow for analyzing the spatially heterogeneous data quality of VGI by a.) providing a spatio-­‐temporal database of indicators derived from VGI that can be used in more complex statistical analysis and data mining of the data and b.) to provide a web-­‐based visualization for first visual analysis of the data. The framework is based on a database applying a star schema separating geo-spatial and temporal information from attribute values. Further, a web-based client has been implemented on top of a Web Map Service, which allows for visual exploration of the data.

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