Dr. rer. nat.

Hecker, Dirk

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  • Publication
    Visual analytics for understanding spatial situations from episodic movement data
    ( 2012)
    Andrienko, Natalia
    ;
    Andrienko, Gennady
    ;
    Stange, Hendrik
    ;
    Liebig, Thomas
    ;
    Hecker, Dirk
    Continuing advances in modern data acquisition techniques result in rapidly growing amounts of georeferenced data about moving objects and in emergence of new data types.We define episodic movement data as a new complex data type to be considered in the research fields relevant to data analysis. In episodic movement data, position measurements may be separated by large time gaps, in which the positions of the moving objects are unknown and cannot be reliably reconstructed. Many of the existing methods for movement analysis are designed for data with fine temporal resolution and cannot be applied to discontinuous trajectories. We present an approach utilising Visual Analytics methods to explore and understand the temporal variation of spatial situations derived from episodic movement data b y means of spatio-temporal aggregation. The situations are defined in terms of the presence of moving objects in different places and in terms of flows (collective movements) between the places. The approach, which combines interactive visual displays with clustering of the spatial situations, is presented by example of a real dataset collected by Bluetooth sensors.
  • Publication
    A general pedestrian movement model for the evaluation of mixed indoor-outdoor poster campaigns
    ( 2010)
    Liebig, Thomas
    ;
    Stange, Hendrik
    ;
    Hecker, Dirk
    ;
    May, Michael
    ;
    Körner, Christine
    ;
    Hofmann, Urs
    Over the last few years new measurement technology has revolutionized the performance measurement in outdoor advertising. A handful of pioneer countries trace personal mobility now via GPS devices, which allows for precise performance results of arbitrarily positioned outdoor poster campaigns. However, GPS technology has the drawback that it cannot be applied indoors due to signal loss. In Switzerland and Germany many valuable posters are situated in public buildings such as train stations or shopping malls and their evaluation is of high interest. In this paper we therefore present a new approach for the evaluation of mixed indoor-outdoor campaigns. Our approach consists of a general pedestrian movement model in restricted spaces which can be integrated into standard trajectory evaluation. Our approach has been implemented for 27 major train stations in Switzerland.