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H. Hobel, L. Madlberger, A. Thöni, S. Fenz:
"Visualisation of User-Generated Event Information: Towards Geospatial Situation Awareness Using Hierarchical Granularity Levels";
in: "Workshop on Social Media and Linked Data for Emergency Response (SMILE2014) 11th Extended Semantic Web Conference (ESWC2014)", Online Proceedings for Scientific Workshops, 2014, S. 1 - 12.

In recent years, enterprises and emergency response teams
have started to use user-generated content to monitor crises, events and
trends. Especially in critical situations, decision makers must, above all,
quickly assess huge amounts of data. Effective geographical visualization
and aggregation of collected data is an important prerequisite to enable
decision makers to infer the impact of a detected event on, for example,
their supply chains and other physical establishments. However, in ex-
isting literature the aspect of geographical visualization of automatically
analysed events is hardly addressed. In this paper, we propose to intro-
duce hierarchical levels of detail, a concept from Geographic Information
Systems, for the visualization of user-generated data describing a local
event. We developed a tool which can improve the assessment of regional
impacts by offering the possibility to browse and visualize results on lay-
ers aggregating data along individually defined hierarchical dimensions,
e.g. geographical or political districts.