@inproceedings{NagelPietschDoerk, author = {Nagel, Till and Pietsch, Christopher and D{\"o}rk, Marian}, title = {Staged Analysis}, abstract = {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.}, subject = {Stadtgestaltung}, language = {en} } @inproceedings{OttenHildebrandtNageletal., author = {Otten, Heike and Hildebrandt, Lennart and Nagel, Till and D{\"o}rk, Marian and M{\"u}ller, Boris}, title = {Are there networks in maps?}, pages = {3}, abstract = {Shifted Maps proposes a novel visualization method to generate personal geovisualizations of individual movement data. The resulting visual appearance can be characterized as a map network consisting of visited places and their connections. The visited places are shown as circular map extracts scaled according to the time spent there and the movements between the places are represented as edges between the places. A key feature of the Shifted Maps visualization is the possibility to explore the data in three different arrangements based on geo-spatial position, travel time, and frequency of movements. By combining map and network visualizations of movement data, it becomes possible to analyze and compare spatial and temporal topologies.}, subject = {Geographie}, language = {en} } @inproceedings{OttenHildebrandNageletal., author = {Otten, Heike and Hildebrand, Lennart and Nagel, Till and D{\"o}rk, Marian and M{\"u}ller, Boris}, title = {Shifted Maps}, series = {2018 IEEE VIS Arts Program}, booktitle = {2018 IEEE VIS Arts Program}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, address = {Berlin}, organization = {Institute of Electrical and Electronics Engineers (IEEE)}, isbn = {978-1-7281-2805-4}, doi = {10.1109/VISAP45312.2018.9046054}, pages = {1 -- 10}, abstract = {We present a hybrid visualization technique that integrates maps into network visualizations to reveal and analyze diverse topologies in geospatial movement data. With the rise of GPS tracking in various contexts such as smartphones and vehicles there has been a drastic increase in geospatial data being collect for personal reflection and organizational optimization. The generated movement datasets contain both geographical and temporal information, from which rich relational information can be derived. Common map visualizations perform especially well in revealing basic spatial patterns, but pay less attention to more nuanced relational properties. In contrast, network visualizations represent the specific topological structure of a dataset through the visual connections of nodes and their positioning. So far there has been relatively little research on combining these two approaches. Shifted Maps aims to bring maps and network visualizations together as equals. The visualization of places shown as circular map extracts and movements between places shown as edges, can be analyzed in different network arrangements, which reveal spatial and temporal topologies of movement data. We implemented a web-based prototype and report on challenges and opportunities about a novel network layout of places gathered during a qualitative evaluation.}, subject = {Karte}, language = {en} } @inproceedings{UllmannWildScottetal., author = {Ullmann, Thomas Daniel and Wild, Fridolin and Scott, Peter and Duval, Erik and Vandeputte, Bram and Parra, Gonzalo and Reinhardt, Wolfgang and Heinze, Nina and Kraker, Peter and Fessl, Angela and Lindstaedt, Stefanie and Nagel, Till and Gillet, Denis}, title = {Components of a Research 2.0 Infrastructure}, series = {Sustaining TEL : From Innovation to Learning and Practice}, booktitle = {Sustaining TEL : From Innovation to Learning and Practice}, publisher = {Springer}, address = {Heidelberg}, isbn = {978-3-642-16020-2}, issn = {1611-3349}, doi = {10.1007/978-3-642-16020-2_59}, pages = {590 -- 595}, abstract = {In this paper, we investigate the components of a Research 2.0 infrastructure. We propose building blocks and their concrete implementation to leverage Research 2.0 practice and technologies in our field, including a publication feed format for exchanging publication data, a RESTful API to retrieve publication and Web 2.0 data, and a publisher suit for refining and aggregating data. We illustrate the use of this infrastructure with Research 2.0 application examples ranging from a Mash-Up environment, a mobile and multitouch application, thereby demonstrating the strength of this infrastructure.}, subject = {Open Science}, language = {en} } @inproceedings{NagelDuval, author = {Nagel, Till and Duval, Erik}, title = {Muse}, series = {Proceedings of the 2nd International Workshop on Research 2.0. : At the 5th European Conference on Technology Enhanced Learning: Sustaining TEL}, volume = {675}, booktitle = {Proceedings of the 2nd International Workshop on Research 2.0. : At the 5th European Conference on Technology Enhanced Learning: Sustaining TEL}, publisher = {RWTH}, address = {Aachen}, issn = {1613-0073}, pages = {48 -- 52}, abstract = {This paper introduces Muse, an interactive visualization of publications to explore the collaborations between institutions. For this, the data on co-authorship is utilized, as these signify an existing level of collaboration. The affiliations of authors are geo-located, resulting in relations not only among institutions, but also between regions and countries. We explain our ideas behind the visualization and the interactions, and briefly describe the data processing and the implementation of the working prototype. The prototype focuses on a visualization for large tabletop displays, enabling multiple users to explore their personal networks, as well as emerging patterns in shared networks within a collaborative public setting. For the prototype we used the publication data of the EC-TEL conference.}, subject = {Visualisierung}, language = {en} } @inproceedings{NagelHeidmannCondottaetal., author = {Nagel, Till and Heidmann, Frank and Condotta, Massimiliano and Duval, Erik}, title = {Venice unfolding}, series = {NordiCHI '10 : Proceedings of the 6th Nordic Conference on Human-Computer Interaction: Extending Boundaries}, booktitle = {NordiCHI '10 : Proceedings of the 6th Nordic Conference on Human-Computer Interaction: Extending Boundaries}, publisher = {Association for Computing Machinery}, address = {New York}, isbn = {978-1-60558-934-3}, doi = {10.1145/1868914.1869019}, pages = {743 -- 746}, abstract = {We introduce Venice Unfolding, a case study on tangible geo-visualization on an interactive tabletop to enable the exploration of architectural projects in Venice. Our tangible user interface consists of a large display showing projects on a map, and a polyhedral object to browse these data interactively by selecting and filtering various metadata facets. In this paper we describe a prototype employing new methods to communicate territorial data in visual and tangible ways. The object reduces the barrier between the physical world and virtual data, and eases the understanding of faceted geographical data, enabling urban planners and citizens alike to participate in the discovery and analysis of information referring to the physical world.}, subject = {Gegenst{\"a}ndliche Benutzeroberfl{\"a}che}, language = {en} } @inproceedings{NagelDuvalHeidmann, author = {Nagel, Till and Duval, Erik and Heidmann, Frank}, title = {Visualizing Geospatial Co-authorship Data on a Multitouch Tabletop}, series = {Smart Graphics : 11th International Symposium, SG 2011, Bremen, Germany, July 18-20, 2011. Proceedings}, booktitle = {Smart Graphics : 11th International Symposium, SG 2011, Bremen, Germany, July 18-20, 2011. Proceedings}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-22571-0}, issn = {1611-3349}, doi = {10.1007/978-3-642-22571-0_13}, pages = {134 -- 137}, abstract = {This paper presents Muse, a visualization of institutional co-authorship of publications. The objective is to create an interactive visualization, which enables users to visually analyze collaboration between institutions based on publications. The easy to use multitouch interaction, and the size of the interactive surface invite users to explore the visualization in semi-public spaces.}, subject = {Visualisierung}, language = {en} } @inproceedings{NagelDuvalVandeMoere, author = {Nagel, Till and Duval, Erik and Vande Moere, Andrew}, title = {Interactive Exploration of Geospatial Network Visualization}, series = {CHI EA '12 : CHI '12 Extended Abstracts on Human Factors in Computing Systems}, booktitle = {CHI EA '12 : CHI '12 Extended Abstracts on Human Factors in Computing Systems}, publisher = {Association for Computing Machinery}, address = {New York}, isbn = {978-1-4503-1016-1}, doi = {10.1145/2212776.2212830}, pages = {557 -- 572}, abstract = {This paper presents a tabletop visualization of relations between geo-positioned locations. We developed an interactive visualization, which enables users to visually explore a geospatial network of actors. The multitouch tabletop, and the large size of the interactive surface invite users to explore the visualization in semi-public spaces. For a case study on scientific collaborations between institutions, we applied and improved several existing techniques for a walk-up-and-use system aimed at scientists for a social setting at a conference. We describe our iterative design approach, our two implemented prototypes, and the lessons learnt from their creation. We conducted user evaluation studies at the two on-location demonstrations, which provide evidence of the prototype usability and usefulness, and its support for understanding the distribution and connectivity in a geospatial network.}, subject = {Visualisierung}, language = {en} } @inproceedings{AnwarNagelRatti, author = {Anwar, Afian and Nagel, Till and Ratti, Carlo}, title = {Traffic Origins}, series = {2014 IEEE Pacific Visualization Symposium}, booktitle = {2014 IEEE Pacific Visualization Symposium}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, address = {Washington}, isbn = {978-1-4799-2874-3}, issn = {2165-8773}, doi = {10.1109/PacificVis.2014.35}, pages = {316 -- 319}, abstract = {Traffic incidents such as road accidents and vehicle breakdowns are a major source of travel uncertainty and delay, but the mechanism by which they cause heavy traffic is not fully understood. Traffic management controllers are tasked with routing repair and clean up crews to clear the incident and often have to do so under time pressure and with imperfect information. To aid their decision making and help them understand how past incidents affected traffic, we propose Traffic Origins, a simple method to visualize the impact road incidents have on congestion. Just before a traffic incident occurs, we mark the incident location with an expanding circle to uncover the underlying traffic flow map and when it ends, the circle recedes. This not only directs attention to upcoming events, but also allows us to observe the impact traffic incidents have on vehicle flow in the immediate vicinity and the cascading effect multiple incidents can have on a road network. We illustrate this technique using road incident and traffic flow data from Singapore.}, subject = {Visualisierung}, language = {en} } @incollection{NagelPschetzStefaneretal., author = {Nagel, Till and Pschetz, Larissa and Stefaner, Moritz and Halkia, Matina and M{\"u}ller, Boris}, title = {m{\ae}ve - An Interactive Tabletop Installation for Exploring Background Information in Exhibitions}, series = {Human-computer interaction : ambient, ubiquitous and intelligent interaction ; 13th international conference, HCI International 2009, San Diego, CA, USA, July 19 - 24, 2009 ; proceedings, part III}, booktitle = {Human-computer interaction : ambient, ubiquitous and intelligent interaction ; 13th international conference, HCI International 2009, San Diego, CA, USA, July 19 - 24, 2009 ; proceedings, part III}, publisher = {Springer}, address = {Berlin}, isbn = {978-3-642-02580-8}, doi = {10.1007/978-3-642-02580-8_53}, pages = {483 -- 491}, abstract = {This paper introduces the installation m{\ae}ve: a novel approach to present background information in exhibitions in a highly interactive, tangible and sociable manner. Visitors can collect paper cards representing the exhibits and put them on an interactive surface to display associated concepts and relations to other works. As a result, users can explore both the unifying themes of the exhibition as well as individual characteristics of exhibits. On basis of metadata schemata developed in the MACE (Metadata for Architectural Contents in Europe) project, the system has been put to use the Architecture Biennale to display the entries to the Everyville student competition.}, subject = {Benutzeroberfl{\"a}che}, language = {en} } @inproceedings{GoodwinMeierBartrametal., author = {Goodwin, Sarah and Meier, Sebastian and Bartram, Lyn and Godwin, Alex and Nagel, Till and D{\"o}rk, Marian}, title = {Unravelling the Human Perspective and Considerations for Urban Data Visualization}, series = {2021 IEEE 14th Pacific Visualization Symposium (PacificVis)}, booktitle = {2021 IEEE 14th Pacific Visualization Symposium (PacificVis)}, publisher = {IEEE}, address = {New York}, organization = {The Institute of Electrical and Electronics Engineers (IEEE)}, isbn = {978-1-6654-3931-2}, doi = {10.1109/PacificVis52677.2021.00024}, pages = {126 -- 130}, abstract = {Effective use of data is an essential asset to modern cities. Visualization as a tool for analysis, exploration, and communication has become a driving force in the task of unravelling our complex urban fabrics. This paper outlines the findings from a series of three workshops from 2018-2020 bringing together experts in urban data visualization with the aim of exploring multidisciplinary perspectives from the human-centric lens. Based on the rich and detailed workshop discussions identifying challenges and opportunities for urban data visualization research, we outline major human-centric themes and considerations fundamental for CityVis design and introduce a framework for an urban visualization design space.}, subject = {Individuelle Datenverarbeitung}, language = {en} } @article{CayNagelMeier, author = {{\c{C}}ay, Damla and Nagel, Till and Meier, Sebastian}, title = {The UDV Card Deck}, series = {IEEE Computer Graphics and Applications}, volume = {45}, journal = {IEEE Computer Graphics and Applications}, number = {4}, address = {New York}, organization = {Institute of Electrical and Electronics Engineers (IEEE)}, issn = {0272-1716}, doi = {10.1109/MCG.2025.3556573}, pages = {30 -- 44}, abstract = {This paper presents the Urban Data Visualization (UDV) card deck, a tool designed to facilitate reflective discussions and inform the collaborative design process of urban data visualizations. The UDV card deck was developed to bridge the gap between theoretical knowledge and practice in workshop settings, fostering inclusive and reflective approaches to visualization design. Drawing from urban visualization design literature and the results from a series of expert workshops, these cards summarize key considerations when designing urban data visualizations. The card deck guides different activities in an engaging, collaborative, and structured format, promoting inclusion of diverse urban actors. We introduce the card deck and its goals, demonstrate its use in four case studies, and discuss our findings. Feedback from workshop participants indicates that the UDV card deck can serve as a supportive and reflective tool for urban data visualization researchers, designers and practitioners.}, subject = {Fallstudie}, language = {en} }