Selected Publications

In this paper we examine the concept of staged analysis through a case study on visualizing urban mobility exhibited in a public gallery space. Recently, many cities introduced bike-sharing in order to promote cycling among locals and visitors. We explore how citizens can be guided from evocative impressions of bicycling flows to comparative analysis of three bike-sharing systems. The main aim for visualizations in exhibition contexts is to encourage a shift from temporary interest to deeper insight into a complex phenomenon. To pursue this ambition we introduce cf. city flows, a comparative visualization environment of urban bike mobility designed to help citizens casually analyze three bike-sharing systems in the context of a public exhibition space. Multiple large screens show the space of flows in bike-sharing for three selected world cities: Berlin, London, and New York. Bike journeys are represented in three geospatial visualizations designed to be progressively more analytical, from animated trails to small-multiple glyphs. In this paper, we describe our design concept and process, the exhibition setup, and discuss some of the insights visitors gained while interacting with the visualizations.
VISAP 2016

A visualization system that allows a diverse group of users to visually explore public transit data on a multi-touch tabletop. It provides multiple perspectives of the data and consists of three visualization modes conveying tempo-spatial patterns as map, time-series, and arc view. We exhibited our system publicly, and evaluated it in a lab study with three distinct user groups: citizens with knowledge of the local environment, experts in the domain of public transport, and non-experts with neither local nor domain knowledge. We discuss the design considerations in developing our system, and describe our lessons learned in designing engaging tabletop visualizations.
AVI 2014

Visualizing data with geo-spatial properties has become more important and prevalent due to the wide spread dissemination of devices, sensors, databases, and services with references to the physical world. Yet, with existing tools it is often difficult to create interactive geovisualizations tailored for a particular domain or a specific dataset. We present Unfolding, a library for interactive maps and data visualization. Unfolding provides an API for designers to quickly create and customize geovisualizations. In this paper, we describe the design criteria, the development process, and the functionalities of Unfolding. We demonstrate its versatility in use through a collection of examples. Results from a user survey suggests programmers find the library easy to learn and to use.
SouthCHI 2013

Recent Publications

More Publications

  • Staged Analysis: From Evocative to Comparative Visualizations of Urban Mobility
    VISAP 2016

    Details PDF Slides Project Video (Talk) Video (Screencast)

  • From Origins to Destinations: The Past, Present and Future of Visualizing Flow Maps
    Built Environment 42(3), 2016


  • Shanghai Metro Flow – Multiple Perspectives into a Subway System
    Leonardo, 2016

    Details PDF Video Project

  • Are there networks in maps? An experimental visualization of personal movement data
    IEEE VIS Personal Vis Workshop 2015

    Details PDF Video Project

  • Making three Cases for Casual Geovisualizations on Interactive Surfaces.
    DEXIS 2015

    Details PDF

  • Traffic Origins: A Simple Visualization Technique to Support Traffic Incident Analysis
    IEEE PacificVis 2014


  • Isoscope – Visualizing temporal mobility variance with isochrone maps
    IEEE VIS Poster, 2014

    Details PDF Project Poster (PDF)

  • Touching Transport – A Case Study on Visualizing Metropolitan Public Transit on Interactive Tabletops
    AVI 2014

    Details PDF Slides Video

  • Unfolding – A Library for Interactive Maps
    SouthCHI 2013

    Details PDF Slides Code Project

  • Interactive Exploration of a Geospatial Network Visualization
    CHI EA 2012

    Details PDF Slides

Recent Projects

cf. city flows is a comparative visualization environment of urban bike mobility designed to help citizens casually analyze three bike-sharing systems in the context of a public exhibition space.



I am a teaching the following courses at University of Applied Sciences in Mannheim:

  • GDV: Grundlagen der Informationsvisualisierung. Introduction to Information Visualization.
  • SEU: Software Ergonomie und Usability. Software Ergonomics and Usability.
  • MMG: Grundlagen der Mensch Maschine Interaktion. Introduction to Human Computer Interaction.



Anbieterkennzeichnung & Rechtliches
Prof. Dr. Till Nagel
Hochschule Mannheim
Paul-Wittsack-Str 10
D-68163 Mannheim

Inhaltlich verantwortlich nach §6 TDG und §10 MDStV
Prof. Dr. Till Nagel

Zuständige Aufsichtsbehörde
Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg
Königstraße 46
D-70173 Stuttgart