Publications

2017

2016

2015

  • Community and Governmental Responses to an Urban Flash Flood
    Fritze Holger, Kray Christian
    12th International Conference on Information Systems for Crisis Response & Management
  • Ethermap - Real-time Collaborative Map Editing
    Fechner T, Wilhelm D, Kray C
    Conference on Human Factors in Computing Systems (CHI'15)
  • Development of a computerised decision aid for thrombolysis in acute stroke care
    Flynn, D., Nesbitt, D.J., Ford, G.A., McMeekin, P., Rodgers, H., Price, C., Kray, C., and Thomson, R.G.
    BMC Med. Inf. & Decision Making
  • Natural interaction with video environments using gestures and a mirror-image avatar
    Wilhelm, D., Fechner, T., Ostkamp, M., Kray, C.
    Interact
  • Short-range optical interaction between smartphones and public displays
    Ostkamp, M., Heitmann, S., Kray, C.
    4th International Symposium on Pervasive Displays (PerDis 2015)
  • A Gamification Framework for Volunteered Geographic Information
    Martella, R., Kray, C., Clementini, E.
    AGILE
  • Providing directions in indoor spaces: two approaches for public displays compared
    Konkol M, Kray C, Fechner T
    AGILE
  • Fusing Real-Time Geo-Information for a Raster-based Least Cost Navigation in an SDI
    Hillen F, Ehlers M, Meynberg O, Höfle B, Reinartz P
    9th Symposium of the International Society for Digital Earth (ISDE)
  • Geo-reCAPTCHA: Crowdsourcing large amounts of geographic information from earth observation data
    Hillen F, Höfle B
    International Journal of Applied Earth Observation and Geoinformation
  • Routing in Dense Human Crowds Using Smartphone Movement Data and Optical Aerial Imagery
    Hillen F, Meynberg O, Höfle B
    ISPRS International Journal of Geo-Information
  • Geo-Information Fusion for Time-Critical Geo-Applications
    Hillen Florian

2014

2013

  • Gestural Interaction with Spatiotemporal Linked Open Data
    Bartoschek T, Pape G, Kray C, Jones J, Kauppinen T
    OSGEO Journal
  • Transitional Spaces: Between Indoor and Outdoor Spaces
    Kray C, Fritze H, Fechner T, Schwering A, Li R, Anacta VJA
    Spatial Information Theory - 11th International Conference, COSIT 2013
  • Evaluating Mobile Applications in Virtual Environments: A Survey
    Delikostidis Ioannis, Fechner Thore, Fritze Holger, AbdelMouty Ahmed Mahmoud, Kray Christian
  • Using mobile devices to enable visual multiplexing on public displays: three approaches compared
    Ostkamp, M., Hülsermann, J., Kray, C., Bauer, G.
    12th International Conference on Mobile and Ubiquitous Multimedia (MUM '13)
  • Prototyping mobile AR in immersive video environments
    Ostkamp M., Kray C.
    Workshop on Designing Mobile Augmented Reality at Mobile HCI 2013
  • Evaluating location-based services (a position paper)
    Kray C., Delikostidis I.
    Workshop on GeoHCI at CHI 2013
  • Increasing the Usability of Pedestrian Navigation Interfaces by means of Landmark Visibility Analysis
    Delikostidis Ioannis (1), Engel Juri (2), Retsios Bas (3), van Elzakker Corné P.J.M. (3), Kraak Menno-Jan (3) and Döllner Jürgen (2)
    The Journal of Navigation
  • Live & Web-based Parcel Monitoring with Low-cost Sensors
    Bröring Arne, Delikostidis Ioannis, Fries K, Heitmann S, Koalick S, Krüger T, Möllers J, Ohrem A, Ostkamp M, Pape G, Radtke M, Remke A, Röhr F, Ruch L, Schlaphorst A Schumacher D, Wilhelm D, Winkler N, Wirwahn J, Wittkopp J
    16th AGILE Conference on Geographic Information Science
  • Facilitating UAS-based oblique imagery to support Urban Search and Rescue Operations.
    Fritze Holger, Walter Stephanie, Prinz Torsten
    UAV-g 2013
  • Integration of quantitative and qualitative geographic data for disaster response: research challenges
    Degbelo A, De Felice G, Lee JH
    GI-Forum 2013 - Creating the GISociety
  • Modelling the spatial and temporal resolution of a sensor observation
    Degbelo A
    GI-Forum 2013 - Creating the GISociety
  • Fusion of Real-Time Remote Sensing Data and In-Situ Sensor Data to Increase Situational Awareness in Digital Earth Applications
    Hillen F, Ehlers M, Reinartz P, Höfle B
    35th International Symposium on Remote Sensing of Environment (ISRSE)
  • Web-based visibility analysis with LiDAR data
    Hillen, Höfle B
    gis.SCIENCE
  • Towards 4D Cartography-Four-dimensional Dynamic Maps for Understanding Spatio-temporal Correlations in Lightning Events
    Resch B, Hillen F, Reimer A, Spitzer W
    The Cartographic Journal

2012

  • Attacking Location Privacy: Exploring Human Strategies
    Fechner T, Kray C
    14th ACM International Conference on Ubiquitous Computing
  • Visual highlighting on public displays
    Ostkamp M, Bauer G, Kray C
    The International Symposium on Pervasive Displays
  • Tool Support for Prototyping Interfaces for Vision-Based Indoor Navigation
    Möller A., Roalter L., Huitl R., Diewald S., Kray C., Kranz M.
    Workshop on mobile vision and HCI at Mobile HCI 2012
  • Opportunistic Localization to Support Disaster Mitigation in Public Indoor Environments
    Utami T.F., Kray C.
    International Workshop on Smart Mobile Applications at Pervasive 2012
  • GI Zeitgeist 2012 - Proceedings of the Young Researchers Forum on Geographic Information Science
    GI Zeitgeist 2012
  • User-Centered Design of Mobile Geo-Applications
    P.J.M. van Elzakker Corné , Delikostidis Ioannis
  • An ontology design pattern for spatial data quality characterization in the semantic sensor web
    Degbelo A
    The 5th international workshop on Semantic Sensor Networks
  • GIZeitgeist 2012 - Proceedings of the young researchers forum on Geographic Information Science
    GIZeitgeist 2012 Young Researchers Forum on Geographic Information Science
  • Interoperable Web-based 3D Analysis of Laser Scanning Data for Location-based Mobile Applications
    Hillen F, Höfle B
    Geoinformatik 2012
  • Geoinformatik 2012 - Mobilität und Umwelt

2011

  • Scalable Navigation Support for Crowds: Personalized Guidance via Augmented Signage
    Hamhoum F, Kray C
    10th International Conference on Spatial Information Theory
  • Supporting pilgrims in navigating densely crowded religious sites.
    Hamhoum F, Kray C
    Personal and Ubiquitous Computing
  • Shifts in Western North American Snowmelt Runoff Regimes for the Recent Warm Decades
    Fritze Holger, Stewart Iris T., Pebesma Edzer
    Journal of Hydrometeorology
  • Track Based OSM Print Maps
    Fritze Holger, Demuth Dustin, Knoppe Kristina, Drerup Klaus
    Geoinformatik 2011
  • Estimating the spatial resolution of observation data in vector format
    Degbelo A
  • Level of detail of observations in space and time
    Degbelo A, Stasch C

2010

  • User-defined gestures for connecting mobile phones, public displays, and tabletops
    Kray C, Nesbitt D, Dawson J, Rohs M
    the 12th international conference on Human computer interaction with mobile devices and services
  • Design by physical composition for complex tangible user interfaces
    Döring T, Pfleging B, Kray C, Schmidt A
    the 28th of the international conference extended abstracts on Human factors in computing systems
  • Assessing the feasibility of opportunistic peer-to-peer positioning for pedestrians.
    Wagner J, Kray. C
    Ubicomp in the Large: Collaborative Sensing and Collective Phenomena,
  • Opportunistic peer-to-peer pedestrian positioning system.
    Wagner J, Kray. C
    Poster at Pervasive 2010
  • Ethics and Persuasive Technology: An Exploratory Study in the Context of Healthy Living.
    Page R, Kray. C
    The 24th BCS Conference on Human Computer Interaction - HCI2010
  • Evaluating Natural User Interfaces for Public Displays in the Wild.
    Müller J, Michaelis D, Kray. C
    Workshop on Natural User Interfaces: the prospect and challenge of touch and gestural computing at CHI 2010
  • Snowmelt Runoff Regime Shifts Across Western North America
    Fritze Holger, Stewart-Frey Iris, Pebesma Edzer
    15. Münchner Fortbildungsseminar
  • Low-cost Satellite-based Products for the Web-the Example of Fire Web Service
    Foerster T, Fechner T, Fritze H, Loock F, Remke A
    Brazilian Symposium on Geoinformatics
  • Geolocation server - Coordinates become context aware
    Fechner T, Kritzler M, Krüger A
    Indoor Positioning and Indoor Navigation (IPIN)
  • Context-aware access to ontologies on the Web
    Maué P, Llaves A, Fechner T
  • Lokalisation in industriellen Komplexen mit Kontext
    Fechner T
  • Geoinformatik 2010 "Die Welt im Netz"

2009

  • Supporting Device Discovery and Spontaneous Interaction with Spatial References
    Gellersen H, Fischer C, Guinard D, Gostner R, Kortuem G, Kray C, Rukzio E, Streng S
    Personal and Ubiquitous Computing
  • Bridging the gap between the Kodak and the Flickr generations: A novel interaction technique for collocated photo sharing
    Kray C, Rohs M, Hook J, Kratz SG
    Int. J. Hum.-Comput. Stud.
  • Exploring the use of landmarks for mobile navigation support in natural environments
    Snowdon C, Kray C
    the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services.
  • Special issue on evaluating pervasive and ubiquitous systems. International Journal of mobile HCI.
  • Snowmelt Runoff Regime Shifts Across Western North America
    Fritze Holger, Stewart-Frey Iris, Pebesma Edzer
    American Geophysical Union, Fall Meeting 2009
  • Spatial and temporal variation of PM10 concentrations at the street level: a case study for the city of Münster
    Gerharz Lydia E., Henneböhl Katharina, Fritze Holger, Buurman Merret, Malewski Christian, Pebesma Edzer J.
    Geoinformatik 2009

2008

  • Evaluating Ubiquitous Systems with Users (Workshop Summary)
    Kray C, Larsen LB, Olivier PL, Biemans M, van Bunningen A, Fetter M, Jay T, Khan V, Leitner G, Mulder I, Müller J, Plötz T, de Vallejo IL
    Constructing Ambient Intelligence
  • Facilitating Opportunistic Interaction with Ambient Displays
    Kray C, Galani A, Rohs M
    Workshop on Designing and Evaluating Mobile Phone-Based Interaction with Public Displays at CHI 2008
  • Reading with Mobile Phone and Large Display
    Gostner R, Gellersen H, Kray C, Sas C
    Workshop: Designing and Evaluating Mobile Phone-Based Interaction with Public Displays at CHI 2008
  • Experiences of Supporting Local and Remote Mobile Phone Interaction with Touchscreen Based Situated Displays
    Cheverst K, Fitton D, Taylor N, Kray C
    Workshop: Designing and Evaluating Mobile Phone-Based Interaction with Public Displays at CHI 2008
  • Mobile Interaction with the Real World 2008, MIRW 2008, Mobile HCI Workshop, Amsterdam, The Netherlands, September 2, 2008
    No authors listed
  • Towards a location model for indoor navigation support through public displays and mobile devices
    Kray C, Cheverst K, Harrison MD, Hamhoum F, Wagner J
    Workshop on mobile interaction with the real world (MIRW) at mobile HCI 2008
  • Exploring factors that influence the combined use of mobile devices and public displays for pedestrian navigation
    Müller J, Jentsch M, Kray C, Krüger A
    Proceedings of NordiCHI 2008
  • Group coordination and negotiation through spatial proximity regions around mobile devices on augmented tabletops
    Kray C, Rohs M, Hook J, Kratz SG
    Proceedings of IEEE Tabletop 2008
  • Evaluating Pervasive and Ubiquitous Systems
    Connelly K, Siek KA, Mulder I, Neely S, Stevenson G, Kray C
    IEEE Pervasive Computing
  • Digital Earth Summit on Geoinformatics 2008: Tools for Global Change Research

2007

  • Mediating Multi-Party Negotiation Through Marker-Based Tracking of Mobile Phones
    Rohs M, Kray C
    Workshop on Mobile Interaction with the Real World at Mobile HCI 2007
  • Swiss Army Knife meets Camera Phone: Tool Selection and Interaction using Visual Markers
    Kray C, Rohs M
    Workshop on Mobile Interaction with the Real World at Mobile HCI 2007
  • Taming Context: A Key Challenge in Evaluating the Usability of Ubiquitous Systems
    Kray C, Olivier P, Guo AW, Singh P, Ha HN, Blythe P
    Ubiquitous Systems Evaluation 2007 (USE'07) - Workshop at Ubicomp 2007
  • Adaptive Positioning for Ambient Systems
    Kray C, Kortuem G
    Künstliche Intelligenz
  • Engaging with Cultural Content on Ambient Displays
    Kray C, Galani A, Cheverst K
  • Factoring user experience into the design of ambient and mobile systems
    Harrison MD, Kray C, Sun Z, Zhang H
    Engineering Interactive Systems
  • Exploring an option space to engineer a ubiquitous computing system.
    Harrison MD, Kray C, Campos. JC
    2nd International Workshop on Formal Methods for Interactive Systems

2006

  • Rapid prototyping and evaluation of intelligent environments using immersive video
    Singh P, Ha HN, Olivier P, Kray C, Kuang Z, Guo AW, Blythe P, James P
    Proceedings of MODIE workshop at Mobile HCI'06
  • Immersive video as a rapid prototyping and evaluation tool for mobile and ambient applications
    Singh P, Ha HN, Kuang Z, Olivier P, Kray C, Blythe P, James P
    MobileHCI '06: Proceedings of the 8th conference on Human-computer interaction with mobile devices and services
  • Crossmodal Attention in Public-Private Displays
    Olivier P, Gilroy SW, Cao H, Jackson DG, Kray C
    International Conference on Pervasive Services (ICPS)
  • Sharing control of dispersed situated displays between nomadic and residential users
    Kray C, Cheverst K, Fitton D, Sas C, Patterson J, Rouncefield M, Stahl C
    MobileHCI '06: Proceedings of the 8th conference on Human-computer interaction with mobile devices and services
  • Connecting rigorous system analysis to experience centred design in ambient and mobile systems
    Harrison MD, Kray C
    Workshop on Software Engineering Challenges for Ubiquitous Computing
  • CrossBoard: Crossmodal Access of Dense Public Displays
    Gilroy SW, Olivier PL, Cao H, Jackson DG, Kray C, Lin D
    Workshop on Multimodal and Pervasive Services (MAPS'06)

2005

  • Adaptive Navigation Support with Public Displays
    Kray C, Kortuem G, Krüger A
    IUI 2005
  • Towards an integrated approach to positioning
    Kray C, Kortuem G
    Workshop on Spatio-Temporal Reasoning at IJCAI'05
  • Sensing and visualizing spatial relations of mobile devices
    Kortuem G, Kray C, Gellersen H
    Proceedings of UIST 2005
  • HCI issues of dispersed public displays
    Kortuem G, Kray C
    Workshop on Distributed Display Environments at CHI'05
  • A Relative Positioning System for Spatial Awareness of Co-located Mobile Devices and Users
    Hazas M, Kray C, Gellersen H, Agbota H, Kortuem G, Krohn A
    the third international conference on mobile systems, applications, and services (MobiSys 2005)
  • Going more public: situated display design in a care setting through co-realisation
    Graham C, Cheverst K, Rouncefield M, Kray C
    DUX '05: Proceedings of the 2005 conference on Designing for User eXperience
  • Rapid Prototyping and User Centred Design of Interactive Display based Systems
    Fitton D, Cheverst K, Dix A, Kray C, Rouncefield M
    IEEE Pervasive Computing
  • Presenting Route Instructions on Mobile Devices: From Textual Directions to 3D Visualization
    Coors V, Elting C, Kray C, Laakso K
  • Exploring Mobile Phone Interaction with Situated Displays
    Cheverst K, Dix A, Fitton D, Kray C, Rouncefield M, Saslis-Lagoudakis G, Sheridan JG
    Pervasive Mobile Interaction Devices (PERMID 2005), workshop at Pervasive 2005
  • Exploring Bluetooth based Mobile Phone Interaction with the Hermes Photo Display
    Cheverst K, Dix A, Fitton D, Kray C, Rouncefield M, Sas C, Saslis-Lagoudakis G, Sheridan JG
    Proceedings of Mobile HCI 2005
  • Probing Designs: Designing Probes
    Cheverst K, Dix A, Fitton D, Kray C, Rouncefield M, Graham C, Saslis-Lagoudakis G
    Workshop on Appropriate Methods for Design in Complex and Sensitive Settings at OzCHI 2005
  • Exploring Issues of User Model Transparency and Proactive Behaviour in an Office Environment Control System
    Cheverst K, Byon HE, Fitton D, Sas C, Kray C, Villar N
    User Modeling and User-Adapted Interaction, special issue on Ubiquitous Computing and User Modeling
  • A Survey of Map-based Mobile Guides
    Baus J, Kray C, Cheverst K

2004

  • Using Cooperative Artefacts as Basis for Activity Recognition
    Strohbach M, Kortuem G, Gellersen H, Kray C
    Proceedings of EUSAI 2004
  • Cooperative Artefacts: Assessing Real World Situations with Embedded Technology
    Strohbach M, Gellersen H, Kortuem G, Kray C
    Proceedings of Ubicomp 2004
  • Concepts and Issues in Interfaces for Multiple Users and Multiple Devices
    Kray C, Wasinger R, Kortuem G
    MU3I workshop at IUI 2004
  • Gesture-based interface reconfiguration
    Kray C, Strohbach M
    workshop on AI in mobile systems (AIMS 2004) at Ubicomp 2004
  • Interactive Positioning based on Object Visibility
    Kray C, Kortuem G
    Mobile Human-Computer Interaction 2004
  • Inducing Frames of Reference
    Kray C
    Workshop on Spatio-Temporal Reasoning at ECAI 2004

2003

  • Presenting route instructions on mobile devices
    Kray C, Elting C, Laakso K, Coors V
    8th international conference on Intelligent user interfaces
  • Controlling multiple devices
    Wasinger R, Kray C, Endres C
    Workshop on Physical Interaction at Mobile HCI 2003
  • Some Issues on Presentations in Intelligent Environment
    Kray C, Krüger A, Endres C
    first European Symposium on Ambient Intelligence (EUSAI)
  • A Survey of Mobile Guides
    Kray C, Baus J
    Workshop on HCI in mobile guides (MGUIDES) at mobile HCI 2003
  • Situated Interaction on Spatial Topics
    Kray C

2002

  • The eager bidder problem: a fundamental problem of DAI and selected solutions
    Schillo M, Kray C, Fischer K
    AAMAS '02: Proceedings of the first international joint conference on Autonomous agents and multiagent systems
  • Situational Context and Navigational Assistance
    Kray C
    Spatial Cognition 2002
  • Frames of Reference, Positional Information and Navigational Assistance
    Baus J, Kray C
    Fifteenth International Florida Artificial Intelligence Research Society Conference
  • Positionsinformation und Navigationsaufgaben
    Kray C, Baus J, Krüger A

2001

  • REAL: Ein ressourcenadaptierendes mobiles Navigationssystem
    Wahlster W, Baus J, Kray C, Krüger A
    Informatik, Forschung und Entwicklung, Themenheft Mobile Computing
  • A Resource-Adaptive Mobile Navigation System
    Wahlster W, Baus J, Kray C, Krüger A
    Proceedings of the International Workshop on Information Presentation and Natural Multimodal Dialogue (IPNMD-2001)
  • Two Path Prepositions: along and past
    Kray C, Baus J, Zimmer H, Speiser H, Krüger A
    Spatial Information Theory (Proceedings of COSIT'01)
  • Spatial Reasoning and Agents: Exploring Possibilities (Position Paper)
    Kray C
    Workshop on Spatio-Temporal Reasoning with an Agents Focus at IJCAI'01
  • The benefits of multi-agent systems in spatial reasoning
    Kray C
    Proceedings of FLAIRS '01
  • RAJA: a resource-adaptive Java agent infrastructure
    Ding Y, Kray C, Malaka R, Schillo M
    the Fifth International Conference on Autonomous Agents
  • Visualization of route descriptions in a resource-adaptive navigation aid
    Baus J, Kray C, Krüger A
    Cognitive Processing
  • Towards adaptive location-aware mobile assistance
    Baus J, Ding Y, Kray C, Walther U
    workshop on AI in mobile systems (AIMS)

2000

  • Spatial Cognition and Natural Language Interfaces in Mobile Personal Assistants
    Kray C, Porzel R
    workshop on AI in mobile systems (AIMS 2000)
  • Zu komplexen Diensten mit einfachen natürlichsprachlichen Interaktionen
    Coors V, Kray C, Porzel R
    Workshop on Digital Storytelling (DISTEL 2000)

1999

  • Modeling the Basic Meanings of Path Relations
    Kray C, Blocher A
    the 16th IJCAI.

1998

  • Ressourcenadaptierende Verfahren zur Präzisionsbewertung von Lokalisationsausdrücken und zur Generierung von linguistischen Hecken.
    Kray C